comp.soft-sys.sas - The SAS statistics package.
SAS-L, Firstly, I am not a statistician, I took basic stats in college about 10 years ago, so I basically know next to nothing about this topic. So I have base SAS and the SAS STAT which I just starting to learn how to use. My question is this, say I have two measurement periods and the num and den (see sample below). How do I find out if the improvement in the second sample is statistically significant? *data* study; input measurement n d; datalines; 1 217 252 2 125 132 ; *run*; *proc* *print*; If it matters the data being tested is healthcare data. Usually we test things like, measure 1 is before some process and measure 2 is after implementation. For argument sake, say the above was testing for lack of readmissions to a hosp in 30 days. Measure 1 was the % of mbrs who did not readmit into the hospital (217/252 = 86% did not readmit to the hosp in 30 days). Measure 2 was the % of mbrs who did not readmit into the hospital after we helped them make follow-up appointments to a specialist after discharge from the hosp (125/132 = 95% did not readmit in 30 days after discharge). If you do propose a suggestion, could you be kind enough to provide a suggestion with the SAS code on how to get the above to run? I have googled genmod and other stat tests and cant really understand how to take my data above and get it to run (and let alone understand what it means!). Thanks in advance for any of your suggestions!! ps - I plan on taking the SAS Institute's Stat and Regression class this year which I know will help me!!
Hi All, I need help with understanding certain basic concepts of significance tests when comparing the results against a norms database. Our norms database has results on several metrics for 25 different products withing the same category. Each category has about 1000 individual respondents rating the product. In total we have 25000 observations on 25 products in our database. (Please note that each product is being rated by a different set of 1000 respondents). In conducting a new study for the 26th product, we want to stat test the metrics for the 26th product against the norms derived on the previous 25 products. Questions: 1) What is the best approach to stat test such metrics. For example we want to stat test the average awareness of all 25 products to the average awareness of the 26th product. 2) Are standard t-tests valid? If yes, is it appropriate to test 25000 respondents against 1000 respondents. Any suggestions are greatly appreciated. Thanks, Zai
Dear all, I am testing significance at each time point using proc freq. My code is as below proc feq data = x; by visit; tables center*ept*treatment/cmh; run; I am not quite sure from which dataset i can get the p-value. Can someone tell me like in GLM we use the modelanova dataset to get the p- value. How can we get the pvalue when testing using proc freq/CMH statistics. Regards,
Hi, Given a multiple regression equation with (say) 4 IV's, how I can test for the significance of the difference between (say) beta 1 and beta 2, or (say) beta 1 and beta 4? Much thanks, Joe