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2007 Jun 09
7
create 2 fk referencing the same table
Hi everyone! I have a problem with defining 2 fk referencing the same
table. I have a Program table and a Team table. The Program should
have an away team and a home team fk. From my understanding, "the fk
column should be named after the class of the target table, converted
to lowercase, with _id appended". But, in my case, I have 2 fk
referencing the same table. How can I do this?
2010 Sep 08
4
coxph and ordinal variables?
Dear R-help members,
Apologies - I am posting on behalf of a colleague, who is a little puzzled
as STATA and R seem to be yielding different survival estimates for the same
dataset when treating a variable as ordinal. Ordered() is used to represent
an ordinal variable) I understand that R's coxph (by default) uses the Efron
approximation, whereas STATA uses (by default) the Breslow. but we