05-23-2019
PSZ
Calcite | Level 5
Member since
08-10-2018
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Latest posts by PSZ
Subject Views Posted 573 05-16-2019 09:42 AM 1458 01-07-2019 05:38 PM 898 01-07-2019 05:34 PM 1610 11-28-2018 06:04 PM 1043 11-28-2018 04:10 PM 3876 11-28-2018 04:03 PM -
Activity Feed for PSZ
- Posted Re: Adding numbers at risk for phreg competing risk? on SAS Procedures. 05-16-2019 09:42 AM
- Posted Re: How to get the change rate using proc mixed? how to explain proc mixed output? on SAS Programming. 01-07-2019 05:38 PM
- Posted Re: proc mixed with baseline age centered. Do I need add baseline age to all follow up visits? on SAS Programming. 01-07-2019 05:34 PM
- Posted How to get the change rate using proc mixed? how to explain proc mixed output? on SAS Programming. 11-28-2018 06:04 PM
- Posted proc mixed with baseline age centered. Do I need add baseline age to all follow up visits? on SAS Programming. 11-28-2018 04:10 PM
- Posted Re: how to adjust for several covariates in mixed model (baseline adjustments) on Statistical Procedures. 11-28-2018 04:03 PM
01-07-2019
05:38 PM
Thanks for your reply. If I understand correctly, the coefficient of the interaction term (group * visit) (i.e. the slop of the model) is the change rate.
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01-07-2019
05:34 PM
Thank you very much!
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11-28-2018
06:04 PM
I have 1000 persons data with 5 years' annual bone mineral density (BMD) measurement. Now I want to get the bone mineral density (BMD) change rate per year. Because this is longitudinal data, I think I should use proc mixed. My data is like: id visit group bmd 1 0(baseline) a 1.01 1 1 a 1.00 1 2 a 1.00 1 3 a 0.99 1 4 a 0.98 1 5 a 0.96 2 0(baseline) b 1.07 2 1 b 1.06 2 2 b 1.04 2 3 b 0.99 2 4 b 0.95 2 5 b 0.93 ...... My code is : PROC MIXED DATA=mydaa noclprint; CLASS id visit group; MODEL bmd = visit group group*visit / SOLUTION CL DDFM=KR OUTPM=aaa; REPEATED visit / SUBJECT=id TYPE=UN R RCORR; RUN; Is this code correct? and where can I get the change rate in the output? I read one paper said the estimate is the change rate, but the numbers are positive (the change rate should negative). And I plot the result like this: PROC SGPLOT DATA=aaa; SERIES x = visit y = pred / GROUP = group MARKERS; RUN; The plot looks correct. But how can I get the numbers for the slop? Thank you very much for your help.
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11-28-2018
04:10 PM
If I want to adjusted my model by baseline age, do I need to add baseline age to all the follow up visits? For example, person visit group Age bloodpressure 1 baseline a baseline age 100 2 baseline b baseline age 101 1 visit1 a baseline age or visit1 age? 101 2 visit1 b baseline age or visit1 age? 102 Thank you very much!
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11-28-2018
04:03 PM
Have you got the answer for your question? I have a question about your data set. Did you add your baseline weight for the follow up studies? For example: person visit group weight bloodpressure 1 baseline placebo baseline weight 100 2 baseline active baseline weight 101 1 visit1 placebo baseline weight or visit1 weight? 100 2 visit1 active baseline weight or visit1 weight? 101
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