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I am building models whose dependent variable (1) is zero-inflated (or, in the econometric literature, "limited"); (2) is continuous in nature and (3) follows a lognormal distribution in the non-zero part.
I have reviewed the literature and found that a two part model maximizing a joint likelihood might be suitable. The problem is that this process does not seem to be supported by built-in procedure of SAS. So I decide to formulize the joint likelihood and let SAS maximize it and report the results.
I am not going into the details of this joint likelihood, but in case someone needs to know it, I will mention it briefly. The joint likelihood concerns the product of the probability that a given sample point exceeds zero and the expected value of that sample point given that it has exceeded zero.
Is there anyway I can tailor my likelihood function to maximize with built-in SAS procedures? References on this issue are also welcome.
Thank you!
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There are two questions revolving PROC MI that I would like to raise:
(1) How can I know to what extent has the imputation completed (i.e., the number of imputation completed) during the imputation process? Multiple imputation is a computer-intensive process. Moreover, its theory tells us to perform as many imputations as possible and putting in as many variables as possible yields the best results, which makes the user feeds in an enoromous dataset when executing imputation, a practice that may cause the time needed to further increase. I often spend much time checking my computer to see if my imputation is done, only to find it is yet to be done. Sometimes the need for an imputed dataset is imminent, so this makes me anxious.
(2) How can I know the "culprit variable" when the errror warning "An imputed variable value is not in the specified range after XXX tries" appears in my log? At present, I have to go through the vast amount of continuous variables in the imputation model to see what variable(s) cause this error. This greatly wastes my time.
Thanks!
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Rather than asking on this forum to "please check my SAS code and tell me what's wrong?", I decided to ask Anthropic's Claude for help.
Well, way too often what Claude suggested simply did not work. I asked again, and again. Claude kept trying to change the SAS code to get it to successfully execute. But, alas, it turned out to be mostly a waste of time. So, just curious what your take is. Do ANY of the LLMs know SAS fairly well, enough for us to post some code and ask it to show where problems are occurring? Your thoughts greatly appreciated.
Nicholas Kormanik
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Hi, I have a large set of users (internal users @saspw) and I'd like to give them the chance to change their internal password by themselves. They have an access to the stored process web app, and only that application. I am thinking of a Stored Process that they could use to change this password. Has someone already created such stored process? Thanks Cédric
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