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KFB has asked 8 questions and find answers to 36 problems.

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KFB questions

data.table := assigning and grouping
dplyr 0.3.0.9000 how to use do() correctly
dplyr 0.3.0.2 rename() idiom unstable when reshape package is loaded
convert data.frame to data.table column missing

KFB answers

How to do histogram with the sum of value of a column in ggplot2?
How to show frequencies in discrete categories with range data in R?
Can't find is.wholenumber() function
remove rows by reference to column values in data.table r
Changing the order of values on the x-axis in R
What's wrong with merging multiple geom_rect()?
Only label selected breaks
Can't change the column names outputted by "gather" to be anything other than the default names
Rug plot does not work when specifying alpha colors?
dplyr: put count occurrences into new variable [duplicate]