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dandvm
‎09-01-2015
  • 6 Posts
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Re: Delete First/Last observation from multiple EU's in a dataset

by Obsidian | Level 7 in SAS Programming
‎01-29-2015 04:41 PM
‎01-29-2015 04:41 PM
ballardw, yes, quite right: I always get the order of the first/last mixed up with the variable--too much object oriented programming--and indeed it does remove any that only have a singular observation. here is the corrected code: data myEdit; set test; by myID; if (first.myID or last.myID) then delete; run; And here is the code with that extra bit, it only strips the first and last, but it will also leave the observation that is a single for the id: data myJunk;   set test;   by myID;   if (not (first.myID and last.myID)) and (first.myID or last.myID) then delete; run; ... View more

Re: NLMixed and Zero Inflated Models with repeated measures

by Jade | Level 19 in Statistical Procedures
‎01-29-2014 11:06 AM
‎01-29-2014 11:06 AM
It looks like the number of function calls is what is causing the lack of convergence.  Those iterations with 200 subiterations look dangerous. Try: nloptions maxiter=200 maxfunc=2000; You may want to try tech=congra in there as well. I think we are in a really bad part of the likelihood surface, if the covariance parameters are that small.  Can you reparameterize--say by multiplying the dependent variable by 1000? Steve Denham ... View more
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