search for: ari_mit

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2012 Apr 12
1
Applying a function to categorized data?
Hi all, I'm just getting started in R. My problem is the following: I have a data frame (v1) with lots of production data measurements. Each row contains a single measurement ('ARI_MIT') with a timestamp. I want to "lump" the data by months with their mean and standard deviation. I have already successfully managed to do the lumping by adding another column to my data frame: v1$MONTH = strftime(v1$TIMESTAMP, "%y%m") This makes a nice month-wise boxplot...