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Hi there, I am trying to install RApache on my Mac (see http://worldofrcraft.blogspot.com/2010/08/installing-rapache-on-mac-os-x-snow.html). I needed to build R with --enable-R-shlib option, so very naively did...
Hi folks, I have a dataframe df.vars with the follwing structure: var1 var2 var3 group Group is a factor. Now I want to standardize the vars 1-3 (actually - there are many more) by class, so I define z...
Hi there, I am not getting anywhere near a solution, so here is my question. I have searched the archives and didn't find a solution, but maybe my search didn't use the right words. So here it is...
Hi there, we are looking for a research assistant for a project on analysing timeseries in the field of educational research. We have timeseries of the subjective perception (I understand, I feel good, I am interested etc.) of 109 students...
Hi Jorge, Chuck and Kane, thanks for your input! The following code based on Jorge's answer did the trick to standardize for subgroups within multiple columns: # define a standardize function, but you could also define your custom standardize function...
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