Displaying 3 results from an estimated 3 matches for "aeasom".
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reasom
2010 May 28
3
Using a loop to define new variables
Hi,
I'm a novice R user, much more used to SAS. My problem is pretty simple - basically, in a data frame, I have variables named
x1,....,x10 and y1,...,y10; and I would like to create r1 = x1 / y1 etc
Apologies if this is way too rudimentary - but I couldn't find any posts online which solve this exact issue.
Cheers,
Andre
2010 Oct 06
3
Adding a time variable prior to using reshape
Hi,
I want to use reshape to convert from a skinny to a wide data format. My data doesn't have a time variable attached - I have a series of ordered observations for each subject, and it is this ordering that I am interested in (my objective is to model the most recent observation based on the preceding observations). From my understanding, prior to using reshape I have to attach a time
2011 Nov 04
2
Select some, but not all, variables stepwise
Hi,
I would like to fit a linear model where some but not all explanators are chosen stepwise - ie I definitely want to include some terms, but others only if they are deemed significant (by AIC or whatever other approach is available). For example if I wanted to definitely include x1 and x2, but only include z1 and z2 if they are significant, something like this:
df <-