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The previous KDnuggets Poll asked: What are your preferred methods for storing data for data mining?

Based on 403 votes from 262 responders, the most popular format was still text (32%) split between CSV (comma-separated) - 18% and space or tab separated - 14%.

In the second place was storing data in a database system (23%), and the third place was using SAS (14%).

Here are full results of 2005 KDnuggets Poll on Data Storage Formats.