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

[labbig]

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.

Any clue?

Thank

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