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Dataframe to matrix conversion using tapply turns zeros to NAs...

Reshape dataframe to wide format for GLM analysis...

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Barplots with multiple factor groupings and mean of variable across those factors...

assign column names as row names after using lapply...

calculate statistics and/or a function on multiple columns in subsets of a dataframe in R...

Problems with grouping factor, data frame, and tapply...

How to Use nlsLM function together with one of the apply family function in R...

Converting for-loop into -apply function where input is a dataframe not vector...

Aggregate the total revenue for each date by using aggregate function...

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Box plot error when adding mean...

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Use tapply and show results on two criteria...

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Calculate accuracy by groups...

deal with NA's when using tapply...

using tapply in tapply...

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Computing pairwise Hamming distance between all rows of two integer matrices/data frames...

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Cut a variable differently based on another grouping variable...

Processing lists of lists by group...

Calculating quintile based scores on R...