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How should I transform non-negative data including zeros?
Error in boxcox.default(y ~ x) : response variable must be positive

I want to perform box cox transformation on data using R tool .If anybody can help me with examples or commands to show how it is done in R tool. Thank you in advance.

My main problem is I want to take log of data but if data entries contain 0 then log 0 becomes infinite .To handle this situation I am searching for the past 3 days .I found one solution to use boxcox transformation..but again it is giving this error.

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As stated, this question asks no more than a pointer to the on-line help for boxcox. If you provide more details (available data, research question, reason to apply a Box-Cox transformation), it might be of interest to the statistical community. Otherwise, it will be closed as off-topic (see our FAQ for more information). –  chl Jan 9 '13 at 10:33
    
I have added the relevant information. –  Komal Jan 9 '13 at 11:25
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So I do not see how this question differs from your other one: stats.stackexchange.com/q/47296/930. –  chl Jan 9 '13 at 13:23
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marked as duplicate by Andy W, gung, chl Jan 9 '13 at 13:25

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

1 Answer

Have a look at the boxcox function (documentation here).

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I have seen this link earlier..I am getting this "Error in boxcox.default(y ~ x) : response variable must be positive" error when I am using boxcox.. –  Komal Jan 9 '13 at 7:44
    
My main problem is I want to take log of data but if data entries contain 0 then log 0 becomes infinite .To handle this situation I am searching for the past 3 days .I found one solution to use boxcox transformation..but again it is giving this error. –  Komal Jan 9 '13 at 7:46
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