On Apr 26, 2010, at 12:55 AM, Rob James wrote:
What causes the error report:
logical(0)
to arise in the rms function lrm?
Here's my data:
But both the dependent and the independent variable seem fine...
> str(AABB)
'data.frame': 1176425 obs. of 9 variables:
$ sex : int 1 1 0 1 1 0 0 0 0 0 ...
$ faint : int 0 0 0 0 0 0 0 0 0 0 ...
Here's the simplified model and error
AABB$model1 < lrm (faint ~ sex)
logical(0)
Two possibilities (four actually):
1) The call. If your call was:
AABB$model1 < lrm (faint ~ sex)
Then you have made two errors in that call:
a) using a dyadic logical operator "<" instead of an an assignment.
Since AA
b) not providing a data argument in lrm
c) since the results of lrm will not be a vector of the same row count
as AABB the assignment would probably have failed anyway.
But the data seem fine....
> table(AABB$faint)
2) That is not actually enough to prove that the "data is fine". For
such a statement you would need:
table(AABB$faint, AABB$sex)
0 1
1173475 2950
> table(AABB$sex)
0 1
502551 673874
Suggestions?
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