Several possible errors may occur during the Fit operation.
fitted value less than or equal zero
fitted value equal to zero
fitted value for binomial model is outside range
These messages indicate that the fitted value is outside the range allowed for the error distribution. For the Binomial model this shouldn’t happen when using the link functions which map to values 0 to 1 but may happen when using for example a linear link with the Binomial errors. The error is telling you that in this case it is not a good idea.
divergence has occurred
GLMStat has determined that the deviance has increased. Something is very wrong with your model.
failure to converge in specified iterations
This usually occurs when fitting Binomial data and some of the values are zero or equal to the Binomial N. For this error the results are valid. If the deviance is small then you may use the results as usual.
fitted values limited at 0 or binomial N
when fitting a Binomial model indicates that an attempt has been made to fit values with πi equal to 0 or 1. This tends to do nasty things to the fitting algorithm so the fitted values are restricted from approaching closer than
10-8 of 0 or N. This does produce some minor problems with the residuals but as you are probably fitting a full model then these should be zero anyway so ignore the very small values. You probably won’t get this at all unless you increase the maximum number of iterations.
memory error
Increase the memory allocated to GLMStat.
number of aliased parameters changed
Where for the first iteration a parameter is close to being aliased its status may be changed on subsequent iterations. The solution is to modify the alias tolerance (in Define dialog) by a Factor of 10 so that the parameter is either in or out. Another cause may be that with a Binomial model the fitted value is approaching 0 or N and so with a logistic link the parameter estimate and standard error approach infinity.
weight column contains negative values
Values must be positive.
binomial N must be greater than 0
GLMStat doesn’t automatically remove these rows.
unknown error occurred
GLMStat has detected that an error has occurred but doesn’t know why. You should tell me about this so I can provide a more informative message.
