[R] Why predicted values are fewer that the real?

[David Winsemius]

On Mar 2, 2012, at 11:19 AM, labbig wrote:

> Hi
>
> i am running a glm model family Gamma(link=log) trying to predict a  
> vector
> of 1554 (real) values
>
> Using predict() i got a vector of 950 predicted values instead of  
> 1554.
> The predictions are good though
> The model doesnt take account of negative values and NAs which are  
> only 121
> values.

Taking the logs of negative numbers?

> Any clue?

I see a couple of possibilities.

> View this message in context: http://r.789695.n4.nabble.com/Why-predicted-values-are-fewer-that-the-real-tp4438912p4438912.html
> Sent from the R help mailing list archive at Nabble.com.

-- 
David Winsemius, MD
West Hartford, CT