I run into some convergence issues when using proc model to estimate a highly nonlinear model. I tried to start from different starting point (using the option startiter) and raise the convergence criteria (for example, change the value from 0.000001 to 0.001), but nothing has worked. One hint I can get from the program is that the RPC value is always missing. Does it tell me something? In addition, I looked the correlation matrix of the explanatory variables. Although there are some eigenvalues are very small, but they are not too small.
The model is fairly complicated. There are about 1 million observations and I checked the variance covariance matrix of the explanatories is full rank. However, the computation of RPC is missing, but everything else can show. That makes me wonder what it tells me.
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