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4 results for “from:James J. Roper”

complex data summary
James J. Roper · Feb 26, 2009 · r-help

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Using "subset" in correlation analysis
James J. Roper · Mar 19, 2008 · r-help

The correlation test function says that it can do a subset where one specifies the subsete vector. I cannot seem to get it to work. For example, the command line is: cor.test(adults$Alt, adults$Cab, alternative="greater", method...

data in form of a date
James J. Roper · Nov 22, 2006 · r-help

Dear all, I often use dates and times in analyses. I just can't figure out how to format my date or time column in R. So, apparently R sees the date as something other than date (character). Let's...

if - else
James J. Roper · Jul 25, 2007 · r-help

Greetings, I have some confusion with the use of if - else. Let's say I have a four variables as follows: Condition DateFound DateFirstEvent DateSecondEvent NA 10Jan2000 NA NA 0 05Jan2000 07Jan2000 10Jan2000 1 07Jan2000 07Jan2000 08Jan2000 2 09Jan2000 NA...

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