[R] mgcv package, problems with NAs in gam

[grace]

Hi there,

I'm using presence-absence data in a gam (i.e. 0 or 1 as values)
I am trying to run a gam with 'dummy covariates' i.e. 1~1
unfortunately my model:
*
model<-gam(1~1, data=bats, family=negbin)*

keeps putting out:

*
Error in gam(1 ~ 1, data = bats, family = negbin) : 
  Not enough (non-NA) data to do anything meaningful*

Is there a specific reason it would do this? I have tried using various
actions on NAs, na.pass etc, as well as asking it to turn all NAs to 0 but
to no avail.

I would post the data here but its rather long, basically 28x104 matrix of
0/1 with headers 'v1:v28' .The summary for the data comes up fine, it's just
the model that isn't working. 
However if I run using:

*model<-gam(v1~v2, data=bats, family=negbin)
* 

it tends to work.

Any help is seriously appreciated as I have a deadline and have been trying
this for days,

Thanks!



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