Dear R-help members,
Apologies for the trouble.
I have a question :
Essentially, I have a dataset which stores genetic variations for individual
patients. Each individual patient can have more than one variation, and each
new record corresponds to a new variation (thus, both individual patients
and variations are non-unique).
So the dataset looks something like this ((letters = patients, numbers =
variation type).
Patient, Variation Type
A, 1
A, 2
A, 3
B, 1
C, 2
D, 2
D, 3
E, 2
E, 4
F, 4
My final desired output is a data.frame or a vector containing patients,
each corresponding to a desired subset of variations. For e.g., if I only
was interested in variation type 2,3, my output would look like this.
A, 2
B, 0
C, 1
D, 2
E, 1
F, 0.
I am trying to figure out how to use tapply to do this.
It would be something like tapply (Variation Type, Patient, ??? )
I am not sure about the function syntax of ??? to subselect only 2,3, and
have been looking at the r-help.
Sorry! Essentially, I am trying to avoid awkward loops in this whole
process.
Thanks very much for your advice!
Min-Han
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