Search results for Probability Statistics

Probability Mass and Density Functions
...to different properties for the probability density function: In this case, p(x) is not necessarily less than 1 because it doesn’t correspond to the probability (the probability itself will still need to be between 0 and 1). Example 5. For instance, let’s say that we have a...https://www.kdnuggets.com/2019/05/probabilitymassdensityfunctions.html

Basic Statistics in Python: Probability
...data! We can use statistics to calculate probabilities based on observations from the real world and check how it compares to the ideal. From statistics to probability Our data will be generated by flipping a coin 10 times and counting how many times we get heads. We will call a set...https://www.kdnuggets.com/2018/08/basicstatisticspythonprobability.html

Naive Bayes: A Baseline Model for Machine Learning Classification Performance
...parts of Bayes Theorem: P(AB)  Posterior Probability The conditional probability that event A occurs given that event B has occurred. P(A)  Prior Probability The probability of event A. P(B)  Evidence The probability of event B. P(BA)  Likelihood The conditional probability of B occurring...https://www.kdnuggets.com/2019/04/naivebayesbaselinemodelmachinelearningclassificationperformance.html

The Data Science Interview Study Guide
...Conditional Prob Article Probability Quiz Probability & Statistics — Set 6 Probability & Statistics — Set 2 Independent Probability Dependent Probability Probability Interview Questions Most of these questions are either similar to the ones we have been asked or taken directly from...https://www.kdnuggets.com/2020/01/datascienceinterviewstudyguide.html

Probability Learning: Bayes’ Theorem
...ositive (E) in a test for such disease, which is what we actually want to calculate. The vertical bars () in a probability term denote a conditional probability (ie, the probability of A given B would be P(AB)). The left term of the numerator on the right side P(EH) is the probability of the...https://www.kdnuggets.com/2019/10/probabilitylearningbayestheorem.html

5 Probability Distributions Every Data Scientist Should Know">5 Probability Distributions Every Data Scientist Should Know
...s Aires University, and a data scientist at MercadoLibre. He also writes about machine learning and data on www.datastuff.tech. Original. Reposted with permission. Related: Data Science Basics: Power Laws and Distributions Basic Statistics in Python: Probability Probability Mass and Density...https://www.kdnuggets.com/2019/07/5probabilitydistributionseverydatascientistshouldknow.html

Unfolding Naive Bayes From Scratch
...e probabilistic scores! Step # 3 : Using Probability to Predict Label for Tokenized Test Example The not so intimidating mathematical form of finding probability Probability of a Given Test Example i of belonging to class c let i = test example = “Very good food and service!!!” Total number of...https://www.kdnuggets.com/2018/09/unfoldingnaivebayes.html

How Bayesian Inference Works">How Bayesian Inference Works
...The posterior, P(w  m), shows the probability of Reign being a given weight, given the measurements we made. This is what we are most interested in. Probability of data, P(m), shows the probability that any given data point will be measured. For now we’ll assume this is a constant, that is, that...https://www.kdnuggets.com/2016/11/howbayesianinferenceworks.html

Bayes Theorem for Computer Scientists, Explained
…n. This article aims to clear up some foundational concepts in probability (and, briefly, how they apply to computer science) as quickly as possible. Probability Theory What? Probability theory is a branch of mathematics concerned with random processes (also known as stochastic processes). Why?…https://www.kdnuggets.com/2016/02/bayestheoremcomputerscientistsexplained.html

Probability Distributions in Data Science">Probability Distributions in Data Science
...ights). From discrete random variables, it is possible to calculate Probability Mass Functions, while from continuous random variables can be derived Probability Density Functions. Probability Mass Functions gives the probability that a variable can be equal to a certain value, instead, the values...https://www.kdnuggets.com/2020/02/probabilitydistributionsdatascience.html

Beta Distribution: What, When & How
...ence world), beta distribution can be used to represent all the possible values that probability can take. Thanks to wikipedia for the definition. In probability theory and statistics, the beta distribution is a family of continuous probability distributions defined on the interval [0, 1]...https://www.kdnuggets.com/2019/09/betadistributionwhatwhenhow.html

The 5 Basic Statistics Concepts Data Scientists Need to Know">The 5 Basic Statistics Concepts Data Scientists Need to Know
...g any more data! Bayesian Statistics Fully understanding why we use Bayesian Statistics requires us to first understand where Frequency Statistics fails. Frequency Statistics is the type of stats that most people think about when they hear the word “probability”. It involves applying...https://www.kdnuggets.com/2018/11/5basicstatisticsconceptsdatascientistsneedknow.html

How I Learned to Stop Worrying and Love Uncertainty
...y is to account for uncertainty, measuring and presenting it instead of reducing and hiding it, and a great framework to do this is known as Bayesian Statistics. Bayesian Statistics Bayesianism is rooted in the idea that probability is a measure of uncertainty and, as such, it is dependent on the...https://www.kdnuggets.com/2018/10/stopworryingloveuncertainty.html

Bayesian Basics, Explained">Bayesian Basics, Explained
...efly explain in layperson's terms what it is and how it differs from the 'ordinary' statistics most of us learned in college? Andrew Gelman: Bayesian statistics uses the mathematical rules of probability to combines data with “prior information” to give inferences which (if the model being used is...https://www.kdnuggets.com/2016/12/bayesianbasicsexplained.html

How to Become a (Good) Data Scientist – Beginner Guide">How to Become a (Good) Data Scientist – Beginner Guide
...nce — an online course for beginners; Business Analytics Fundamentals — another introductory course teaching the basic concepts of BI. Statistics and probability Probability and statistics are the basis of Data Science. Statistics is, in simple terms, the use of mathematics to perform technical...https://www.kdnuggets.com/2019/10/gooddatascientistbeginnerguide.html

Learning and Teaching Machine Learning: A Personal Journey
...nguistics, and computer science. Class prerequisite are kept fairly minimal; those consist of the standard upper division undergraduate coursework in probability, statistics and linear algebra, but we don’t require coursework in more advanced subjects like measuretheoretic probability,...https://www.kdnuggets.com/2014/04/learningteachingmachinelearningpersonaljourney.html

Top 10 Data Mining Algorithms, Explained
...1 given Class A multiplied by the probability of Feature 2 given Class A multiplied by the probability of Class A. The fraction’s denominator is the probability of Feature 1 multiplied by the probability of Feature 2. What is an example of Naive Bayes? Below is a great example taken from a Stack...https://www.kdnuggets.com/2015/05/top10dataminingalgorithmsexplained.html

Probability Learning: Maximum Likelihood
...w, which corresponds to a height of 172 cm) is classified as female, as for that specific height value the female height distribution yields a higher probability than the male one. That’s very cool you might say, but how do we actually calculate these probability distributions? Do not worry, we...https://www.kdnuggets.com/2019/11/probabilitylearningmaximumlikelihood.html

Free Mathematics Courses for Data Science & Machine Learning">Free Mathematics Courses for Data Science & Machine Learning
...me striking a balance between theory and application, leading to a mastery of key threshold concepts in foundational mathematics. Statistics & Probability Statistics and probability are the foundations of data science, more so than any other family of mathematical concepts. These courses...https://www.kdnuggets.com/2020/02/freemathematicscoursesdatasciencemachinelearning.html

How to Become a Data Scientist: The Definitive Guide">How to Become a Data Scientist: The Definitive Guide
...greater.” — Albert Einstein The main topics concerning mathematics that you should familiarize yourself with if you want to go into data science are probability, statistics, and linear algebra. As you learn more about other topics such as statistical learning (machine learning) these core...https://www.kdnuggets.com/2017/08/becomedatascientistdefinitiveguide.html

Modelplotr v1.0 now on CRAN: Visualize the Business Value of your Predictive Models
...y sized groups with the parameter ntiles. Hence, ntiles=100 results in 100 equally sized groups with in the first group the 1% with the highest model probability and in group 100 the 1% with the lowest model probability. These groups are often referred to as percentiles; modelplotr will also label...https://www.kdnuggets.com/2019/06/modelplotrcranbusinessvaluepredictivemodels.html

A comprehensive list of Machine Learning Resources: Open Courses, Textbooks, Tutorials, Cheat Sheets and more
...chine Learning Course. Matrix Calc for DL (pdf here) Really nice overview of matrix calculus for deep learning from Parr/Howard. Citable on on arxiv. Probability and Statistics File Description Seeing Theory Frequentist Inference This is a really beautiful visual presentation of the basic ideas of...https://www.kdnuggets.com/2018/12/finlaysonmachinelearningresources.html

Explaining the 689599.7 rule for a Normal Distribution">Explaining the 689599.7 rule for a Normal Distribution
...x.set_ylim(0); ax.set_title('Normal Distribution', size = 20); ax.set_ylabel('Probability Density', size = 20); The graph above does not show you the probability of events but their probability density. To get the probability of an event within a given range we will need to integrate. Suppose we...https://www.kdnuggets.com/2018/07/explaining6895997rulenormaldistribution.html

Time Series Classification Synthetic vs Real Financial Time Series">Time Series Classification Synthetic vs Real Financial Time Series
..."dashed", size = 1) + geom_histogram(aes(y = ..density..), colour = "black", fill = "white", alpha = 0.1, position = "identity") + ggtitle("Predicted probability density plot") + theme_tq() # The average predicted probability sits around 0.48 / 0.49, for simplicity I will just select 0.50 as the...https://www.kdnuggets.com/2020/03/timeseriesclassificationsyntheticrealfinancialtimeseries.html

Plausibility vs. probability, prior distributions, and the garden of forking paths
...tion has to be peaked around zero. I think there’s a theorem in there for someone who’d like to do some digging. Bio: Andrew Gelman is a professor of statistics and political science and director of the Applied Statistics Center at Columbia University. Andrew has done research on a wide range of...https://www.kdnuggets.com/2016/01/plausibilityprobabilitypriordistributions.html

Essential Math for Data Science: ‘Why’ and ‘How’">Essential Math for Data Science: ‘Why’ and ‘How’
...cs, central tendency, variance, covariance, correlation, Basic probability: basic idea, expectation, probability calculus, Bayes theorem, conditional probability, Probability distribution functions — uniform, normal, binomial, chisquare, student’s tdistribution, Central limit theorem, Sampling,...https://www.kdnuggets.com/2018/09/essentialmathdatascience.html

A Primer on Logistic Regression – Part I
...will churn out. Note that odds can be converted back into probability as In common sense, probability and odds are used interchangeably. However, in statistics, probability and odds are not the same, but different. The dataset (with these relevant terms) is displayed below, which forms the basis...https://www.kdnuggets.com/2016/08/primerlogisticregressionpart1.html

Evaluating the Business Value of Predictive Models in Python and R
...el's business value. Although each plot sheds light on the business value of your model from a different angle, they all use the same data: Predicted probability for the target class Equally sized groups based on this predicted probability Actual number of observed target class observations in...https://www.kdnuggets.com/2018/10/evaluatingbusinessvaluepredictivemodelsmodelplotpy.html

Central Limit Theorem for Data Science – Part 2
...1.5. This is equivalent to saying the standard deviation of the sampling distribution of the mean is 1.5. This value is essential in calculating the probability of us being wrong. Probability of an observation Armed with the standard error, we can now calculate the probability of our...https://www.kdnuggets.com/2016/08/centrallimittheoremdatasciencepart2.html

Learning from 3 big Data Science career mistakes">Learning from 3 big Data Science career mistakes
...a science. When I shifted my career from a software developer to a data scientist, one thing I was struck by was the Mathematics involved, especially Statistics, Probability, Linear Algebra, and Calculus, almost in that order of importance. So, I spent a few months learning all four. It was good,...https://www.kdnuggets.com/2020/02/learningfrombigdatasciencecareermistakes.html

Classification vs Prediction
...obabilities is that they are their own error measures. If the probability of disease is 0.1 and the current decision is not to treat the patient, the probability of this being an error is by definition 0.1. A probability of 0.4 may lead the physician to run another lab test or do a biopsy. When the...https://www.kdnuggets.com/2019/09/classificationprediction.html

A Tutorial on the Expectation Maximization (EM) Algorithm
...here the denominator in Equation 5 comes from. The denominator is the sum of probabilities of observing xi in each cluster weighted by that cluster’s probability. Essentially, it is the total probability of observing xi in our data. If we are making hard cluster assignments, we will take the...https://www.kdnuggets.com/2016/08/tutorialexpectationmaximizationalgorithm.html

How Much Mathematics Does an IT Engineer Need to Learn to Get Into Data Science?">How Much Mathematics Does an IT Engineer Need to Learn to Get Into Data Science?
...value decomposition, i) eigenvalues, eigenvectors, and diagonalization. Here is a nice Medium article on what you can accomplish with linear algebra. Statistics and Probability Only death and taxes are certain, and for everything else there is normal distribution. The importance of having a solid...https://www.kdnuggets.com/2017/12/mathematicsneededlearndatasciencemachinelearning.html

Beating the Bookies with Machine Learning
...can try to have a machinelearning (ML) algorithm do this for us. Betting on darts with the help of ML For the purpose of this project we used darts statistics, including features such as averages, checkout percentages, number of 180s (maximum score with 3 darts) and headtohead statistics. In...https://www.kdnuggets.com/2019/03/beatingbookiesmachinelearning.html

Introduction to Bayesian Inference
...de some examples written in Python to help you get started. To get the most out of this introduction, the reader should have a basic understanding of statistics and probability, as well as some experience with Python. The examples use the Python package pymc3. Introduction to Bayesian Thinking...https://www.kdnuggets.com/2016/12/datascienceintroductionbayesianinference.html

Pvalues Explained By Data Scientist
...erpret the pvalues in our hypothesis testings. Hopefully the hard part now becomes at least slightly easier for you. If you want to learn more about statistics, I highly recommend you to read this book (which I’m reading it now!) — Practical Statistics for Data Scientists written specially for...https://www.kdnuggets.com/2019/07/pvaluesexplaineddatascientist.html

A Gentle Introduction to Noise Contrastive Estimation
...mples, we can analytically calculate any particular word’s probability according to this distribution, Q. For instance, if we define “word1” to have probability 10% and “word2” with probability 90%, and we happen to pull a sample of “word1”, then Q = 0.10; it’s just a reference to the...https://www.kdnuggets.com/2019/07/introductionnoisecontrastiveestimation.html

When Bayes, Ockham, and Shannon come together to define machine learning
...cess (which we can never observe), that is behind the generation of a random variable (which we can observe or measure, albeit not without noise). In statistics, it is generally defined as a probability distribution. But in the context of machine learning, it can be thought of any set of rules (or...https://www.kdnuggets.com/2018/09/whenbayesockhamshannoncometogetherdefinemachinelearning.html

How to correctly select a sample from a huge dataset in machine learning">How to correctly select a sample from a huge dataset in machine learning
...sume that the sample is not biased. The comparison between sample and population is then made this way: Take one variable from the sample Compare its probability distribution with the probability distribution of the same variable of the population Repeat with all the variables Some of you could...https://www.kdnuggets.com/2019/05/samplehugedatasetmachinelearning.html

How to count Big Data: Probabilistic data structures and algorithms
...l University in Ukraine for a number of years and currently works as a software practitioner for ferret go GmbH, the leading community moderation, automation, and analytics company in Germany. Related: 5 Probability Distributions Every Data Scientist Should Know Basic Statistics in Python:...https://www.kdnuggets.com/2019/08/countbigdataprobabilisticdatastructuresalgorithms.html

Introduction to Markov Chains">Introduction to Markov Chains
...cience. He will be a software engineering intern at Airbnb in 2018. He can be reached via LinkedIn. Original. Reposted with permission. Related: What Statistics Topics are Needed for Excelling at Data Science? Applied Statistics Is A Way Of Thinking, Not Just A Toolbox All Machine Learning Models...https://www.kdnuggets.com/2018/03/introductionmarkovchains.html

Data Science for Javascript Developers
...bution is centered around 126K. We can also see that the distribution is skewed, or asymmetrical. Here’s what Wikipedia has to say about skewness: In probability theory and statistics, skewness is a measure of the asymmetry of the probability distribution of a realvalued random variable about its...https://www.kdnuggets.com/2018/03/datasciencejavascriptdevelopers.html

What Top Firms Ask: 100+ Data Science Interview Questions
…“Good food, bad service,” your score might be 1 – 1 = 0. Spark: Capital One Data Engineer Explain how RDDs work with Scala in Spark Statistics & Probability Questions: Google Explain Crossvalidation as if you’re talking to a nontechnical person. Describe a nonnormal probability distribution…https://www.kdnuggets.com/2017/03/topfirms100datascienceinterviewquestions.html

Sound Data Science: Avoiding the Most Pernicious Prediction Pitfall
…enings to sheer randomness. The scientific antidote to this failing is probability, which Taleb affectionately dubs “a branch of applied skepticism.” Statistics is the resource we rely on to gauge probability. It answers the orange car question above by calculating the probability that what’s been…https://www.kdnuggets.com/2017/01/siegeldatascienceavoidingpredictionpitfall.html

How Bayes’ Theorem is Applied in Machine Learning
...s In case you want to go more in depth into Bayes and Machine Learning, check out these other resources: How Bayesian Inference works Bayesian statistics Youtube Series Machine Learning Bayesian Learning slides Bayesian Inference and as always, contact me with any questions. Have a fantastic...https://www.kdnuggets.com/2019/10/bayestheoremappliedmachinelearning.html

Mathematical programming — Key Habit to Build Up for Advancing Data Science">Mathematical programming — Key Habit to Build Up for Advancing Data Science
...al pattern emerges from a set of a large number of repeated experiments of a similar kind through their mutual interaction. Frequentist definition of probability: There are two broad categories of the definition of probability and two fiercely rival camps — frequentists and Bayesians. It is easy to...https://www.kdnuggets.com/2019/05/mathematicalprogrammingkeyhabitadvancingdatascience.html

The Foundations of Algorithmic Bias
…hat it is spam. A simple model might be to assign a score (weight) to every word in the vocabulary. If that weight is positive, then it increases the probability that the email is spam. If negative it decreases the probability. To calculate the final score, we might sum up the counts of each word,…https://www.kdnuggets.com/2016/11/foundationsalgorithmicbias.html

Top Stories, Jul 17: 5 Probability Distributions Every Data Scientist Should Know; NLP vs. NLU: from Understanding a Language to Its Processing
...Workstation a Review and Benchmark NLP vs. NLU: from Understanding a Language to Its Processing Top 8 Data Science Use Cases in Construction 5 Useful Statistics Data Scientists Need to Know Most Shared Last Week NLP vs. NLU: from Understanding a Language to Its Processing, by Sciforce  Jul 03,...https://www.kdnuggets.com/2019/07/topnewsweek07010707.html

Logistic Regression: A Concise Technical Overview
...a variable / feature / column j refers to the category level of the target variable. The baseline model logit (5 & 6) shows us that the predicted probability value is the log odds of log probability j (log(πj)) relative to the selected baseline log probability (log(π1)). Each category...https://www.kdnuggets.com/2019/01/logisticregressionconcisetechnicaloverview.html

The Best Metric to Measure Accuracy of Classification Models
…rvation Actual Predicted 1 NonFraud 0.45 2 NonFraud 0.10 3 Fraud 0.67 4 NonFraud 0.60 5 NonFraud 0.11 Suppose we assume 0.5 as the cutoff probability i.e. observations with probability value of 0.5 and above are marked as Fraud and below 0.5 are marked as NonFraud as shown in the table…https://www.kdnuggets.com/2016/12/bestmetricmeasureaccuracyclassificationmodels.html

Interpretability over Accuracy
...coefficient is not directly related to the response. “Logistic” refers to the logit, which is the log of the odds of the response (odds are equal to probability over one minus probability). So the coefficient relates to a transformation of the probability of response, and because the function is...https://www.kdnuggets.com/2016/08/salfordinterpretabilityoveraccuracy.html

Big Data Lessons from Microsoft “howold” Experiment
…and generally in life, that faces are extraordinarily beautiful and complex. As an artist they are highly difficult to even draw and explain. Clearly probability and statistics have a place in cracking the riddle behind how they work. One day we might wrest control to a robot of quick and…https://www.kdnuggets.com/2015/05/facenumbersbigdatamicrosofthowold.html

How (dis)similar are my train and test data?
...classifier. predictions[:10]output array([ 0.34593171]) So for the first row our classifier thinks that it belongs to training data with .34 probability. Let’s call this P(train). Or we can also say that it has .66 probability of being from the test data. Let’s call this as P(test). Now...https://www.kdnuggets.com/2018/06/howdissimilartraintestdata.html

The 10 Algorithms Machine Learning Engineers Need to Know">The 10 Algorithms Machine Learning Engineers Need to Know
...ssumptions between the features. The featured image is the equation — with P(AB) is posterior probability, P(BA) is likelihood, P(A) is class prior probability, and P(B) is predictor prior probability. Naive Bayes Classification Some of real world examples are: To mark an email as spam or not...https://www.kdnuggets.com/2016/08/10algorithmsmachinelearningengineers.html