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myftime
2010 Mar 05
1
How to parse the arguments from a function call and evaluate them in a dataframe?
...ula, ftime, fstatus, data) {
# step 1: obtain terms in `formula' from dataframe `data'
# step 2: obtain ftime from `data'
# step 3: obtain fstatus from `data'
# step 4: do model estimation
# step 5: return results
}
The user would call this function as:
myfn(formula=myform, ftime=myftime, fstatus=myfstatus, data=mydata)
Where `myform' is a formula object; and the terms in `myform', and the variables `myftime' and `myfstatus' should be obtained from the dataframe `mydata'.
I am getting tripped up in trying to figure out how to do the seemingly simple steps of...