# Will correlated features reduce the accuracy of a classifier? [closed]

Will correlated features reduce the accuracy of a classifier?

Most of the posts related to correlated features talk about using PCA to remove the correlation. My problem is not specific to any algorithms. Or is the question algorithm specific? I understand that correlation may cause numerical troubles in regression but what if we are talking about neural networks, etc.?

## closed as unclear what you're asking by ttnphns, kjetil b halvorsen, Michael Chernick, Peter Flom♦Apr 5 '17 at 11:58

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• cause numerical troubles. After all, are you talking about correlatedness or about multicollinearity? These are different things. – ttnphns Apr 5 '17 at 10:48
• Reduce the accuracy compared to what? – Peter Flom Apr 5 '17 at 11:58
• @PeterFlom to removing the correlated features – user10024395 Apr 5 '17 at 15:06