pwLRT

 p = pwLRT(chisq1, numPars1, chisq2, numPars2)

 Calculates the probability, that in comparison with model 2,
 model 1 is sufficient to explain the data.
 A small p value indicates, that model 2
 should be preferred (which still may not be sufficient).

 Model 2 must be an extension of model 1.