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johanna3
‎04-07-2021
  • 6 Posts
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Re: Risk set matching / sampling

by Calcite | Level 5 in Statistical Procedures
‎04-06-2021 02:41 PM
‎04-06-2021 02:41 PM
Hi Koen, Thank you for your reply. I have done a lot of reading and found some macros - but no where I can download some macro syntax. This surprises me as this is a "common" problem/methodology, and I thought some procedure (like there is now procedures for PS matching of all kinds) or pre-existing code/macro/syntax existed. Im afraid Im not good enough at coding to be able to figure out to code something like this. I have found an old paper (1995) explaining different matching procedures - and exactly this one I need to create a risk set - using a macro called %match - with an appendix to follow up. I was just curios if that kind of syntax was available anywhere to be adjusted to my data of course - but principally "all" risk set matching is the same - based on different variables of course. This is the paper: https://www.mayo.edu/research/documents/biostat-56pdf/doc-10026923 ... View more

Re: Risk set matching / sampling

by Calcite | Level 5 in Statistical Procedures
‎04-06-2021 12:55 PM
‎04-06-2021 12:55 PM
Dear Dave, PSMATCH does not work as it condition on the future, so I need to do a risk set matching instead. ... View more

Risk set matching / sampling

by Calcite | Level 5 in Statistical Procedures
‎04-06-2021 03:31 AM
‎04-06-2021 03:31 AM
Hi,   I need to do risk set matching on my dataset.   The cases are women whom become pregnant at eg. day X after diagnosis. The controls are the entire population and a woman can be a control if not yet pregnant at day X.    Does anyone know where to download syntax for a macro or anything that can be of use. Besides the time variable I have an already calculated PS score to match on. I would prefer to do it with replacement.      ... View more

Re: Greedy PS MATCH

by Calcite | Level 5 in Statistical Procedures
‎03-16-2021 03:01 AM
‎03-16-2021 03:01 AM
Thank you - that makes sense. ... View more

Re: Greedy PS MATCH

by Calcite | Level 5 in Statistical Procedures
‎03-15-2021 02:50 PM
‎03-15-2021 02:50 PM
Hi Michaell,   I have tried this, but for some reason I dont know this results in a dataset where two or more cases come out with the same _matchID. I dont know why this happens, but I need individual matchid's pr. case. Do you have any ideas on how/why this happens, and how I can avoid it? ... View more

Greedy PS MATCH

by Calcite | Level 5 in Statistical Procedures
‎03-15-2021 10:54 AM
‎03-15-2021 10:54 AM
Hi,   I would like to do a greedy matching - but with replacement and all of the possible control matches pr. case - does anyone know how to code this in the PSMATCH procedure?   I need to have all possible matches shown pr. case within the specified caliper of course as I need to take another variable into account after the matching procedure.   Present code is this which works, but 1) Doesnt provide all possible matches 2) doesnt have replacement:   ods graphics on; proc psmatch data=stat5 region=cs; class eventbarn; psdata treatvar=eventbarn (Treated='1') ps=ssps; match method=greedy (k=3) caliper=0.2; assess ps var=(baseline_edss disease_duration age_diagnosis) / plots=all; output out(obs=match) =outstat1 matchid=_matchid; run;   ... View more
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