Posts Tagged ‘ NA ’

The difference between “letters[c(1,NA)]” and “letters[c(NA,NA)]“

April 22, 2010
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In David Smith’s latest blog post (which, in a sense, is a continued response to the latest public attack on R), there was a comment by Barry that caught my eye. Barry wrote: Even I get caught out on R quirks after 20 years of using it. Compare letters and letters for the most recent thing that made me...

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Replacing 0 with NA – an evergreen from the list

June 15, 2009
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Replacing 0 with NA – an evergreen from the list

This thread from the R-help list describe an evergreen tip that, at least once, is proved useful in R practice.

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Dealing with missing values

March 8, 2009
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Dealing with missing values

Two new quick tips from 'almost regular' contributor Jason: Handling missing values in R can be tricky. Let's say you have a table with missing values you'd like to read from disk. Reading in the table with, read.table( fileName ) might fail. If ...

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