robertf's articles:

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Re: lag calculation macro #4 0 26 (2/3/2010 5:57:14 PM) comp.soft-sys.sas Thanks Joe! It's tempting to use macros or arrays in SAS when a simpler code works far more efficiently. Too bad there isn't a SAS guide that covers common pitfalls in SAS programming such as this. =20 From: ... RobertF

Re: lag calculation macro #3 0 28 (2/3/2010 5:19:21 PM) comp.soft-sys.sas Perfect, works like a charm! Thanks Arthur! -----Original Message----- From: Arthur Tabachneck [mailto:art297@NETSCAPE.NET] Sent: Wednesday, February 03, 2010 10:59 AM To: SAS-L@LISTSERV.UGA.EDU; Feyerharm, R... RobertF

lag calculation macro 0 22 (2/3/2010 4:47:37 PM) comp.soft-sys.sas Has anyone else struggled with the lag function in SAS? The lag function often doesn't work in an intuitive manner in conditional statements, or if missing values are involved. Anyways, I wrote a short macro c... robertf

Re: multiple comparisons criteria #3 0 24 (1/15/2010 3:05:23 PM) comp.soft-sys.sas Thanks for the input, Peter and Susan, much appreciated! Robert ... robertf

multiple comparisons criteria 1 46 (1/13/2010 5:25:35 PM) comp.soft-sys.sas When performing a family of multiple statistical tests simultaneously, what is the definition of "family" and "simultaneous" for the purposes of calculating a Bonferonni correction? If I perform N simulatneous... robertf

Fisher's exact test appropriate here? 2 142 (1/8/2010 8:57:40 PM) comp.soft-sys.sas I'm comparing various pregnancy & delivery complication rates between the Medicaid and Non-Medicaid populations in my State. These rates are often quite small (for example, 17/20,833 vs 26/26,602). There a... robertf

Re: missing numerical values = - infinity? #2 0 190 (12/23/2009 11:34:29 PM) comp.soft-sys.sas Here's what I get if I assign "NA" to A, then attempt to evaluate the statement "if A=2500 then z=1": > A if(A=2500)z= 2500) z if(NA= 2500 then .... in both cases the THEN action does NOT take place, r... RobertF

Re: missing numerical values = - infinity? 0 244 (12/23/2009 10:52:01 PM) comp.soft-sys.sas Thanks Mark, I agree that one must carefully tailor code to deal with missing values in SAS or any language. That's interesting that Stata sets missing values at positive infinity. The R programming langua... RobertF

missing numerical values = - infinity? 1 207 (12/23/2009 8:52:28 PM) comp.soft-sys.sas Going into rant mode... I discovered a feature of SAS that I wish I had known earlier: SAS will assign a value of *negative infinity* to missing numerical values in logical statements. So in the following ... robertf

Re: proc power question for McNemar test 0 503 (12/23/2009 5:17:34 PM) comp.soft-sys.sas Thanks Robin, this is very helpful! Robert -----Original Message----- From: Robin R High [mailto:rhigh@unmc.edu] Sent: Monday, December 21, 2009 1:19 PM To: Feyerharm, Robert W. Cc: SAS-L@LISTSERV.UGA... RobertF