I have everything in the data frame now. The calculations I need to preform for each round are slightly different. How do I specify to make one calculation for one round and one for the other? (One round is called "C", and the other is "F")
Thomas Levine On Thu, 2008-01-24 at 18:23 -0500, Thomas Levine wrote: > By accident, I didn't send this to the list. > > > > On Thu, 2008-01-24 at 17:54 -0500, Thomas Levine wrote: > > > Oh, right, I don't need the differences. I only needed to get the > > differences before because I was doing them sloppily in a > > spreadsheet and needed to do a t-test manually because the program > > didn't have a function for one type of t-test. I shall do it this > > way then. > > > > > > > > > > On Thu, 2008-01-24 at 12:05 -0700, Greg Snow wrote: > > > > > Here is how I would do it (there are multiple ways you could do it, so > > > there is not single "Right" answer): > > > > > > Assign each person a unique identifier. > > > > > > Put all the information from the questionaire along with the idenifier > > > and anything else that does not change between rounds (age, sex, height, > > > ...) into one data frame. This df will have as many rows as you have > > > subjects. > > > > > > The round information then goes into a second data frame with each round > > > being a row (each subject has multiple rows) and include the unique > > > identifier on each row for that person. > > > > > > If you need information combined from both data frames, then use the > > > merge function to merge the 2 data frames (or subsets of them) together. > > > > > > Advantages of this method include: > > > > > > Uses data frames which most of the analysis functions expect. > > > Each piece of data is only entered once (other than the id) > > > > > > Disadvantage: > > > > > > Data is split between 2 objects. > > > > > > > > > Hope this helps, > > >
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