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43 results for “from:Jonathan Williams”

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subtracting 100 from strptime year vector generates missing values in POSIXct where none appear to exist in strptime year vector

Jonathan Williams · Feb 23, 2010 · r-help

Thanks Don MacQueen for this reply to my initial query - please SEE MY REPLIES TO THESE IDEAS AND FURTHER INFORMATION BELOW >From: Don MacQueen [macq at llnl.gov] >Sent: 23 February 2010 21:25 >To: Jonathan Williams; r-help at...

nested factors different with/out brackets - is this a design feature?

Jonathan Williams · May 6, 2010 · r-help

Dear R Helpers, I came across discrepancies in estimates for nested factors in linear models computed with brackets and also when a crossing factor is defined as a factor or as a dummy (0/1) vector. These are probably designed...

Problem with strptime generating missing values where none appear to exist

Jonathan Williams · Feb 23, 2010 · r-help

Dear R Helpers, I am having difficulty with strptime. I wish to find the differences between two vectors of times. I have apparently no difficulty to convert the vectors to the appropriate format using strptime. But, then difftime does not...

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