I am also curious on two issues of provision of starting values by the user. (1) I remember that maximum likelihood is the method used here. Theoretically, if identifiability holds, then the maximum likelihood estimator should be unique. So is it useful to try different starting values? (2) I had personally tried providing starting values in the NLMIXED procedure and had noted the effect of the provision of starting values. This could have a bearing on the ultimate parameter estimates (contradicting the theoretical result I stated in the last paragraph, which is also something about which I am puzzled). So would not it be subjective if we arbitrarily provide starting values?  ... View more

What is the sample size of your entire data? I saw plenty of observations excluded from analysis due to zero, negative or missing weights. You could alternatively provide the size of the sample eventually used by the GLIMMIX procedure. ... View more

Another paper (Calculating power in analysis of variance. (apa.org)) found on the book Statistical Power Analysis for the Behavioral Sciences | Jacob Cohen | (taylorfrancis.com) also discusses the topic of power calculation in mixed effect models. Of closer revelance to your question is another paper cited in this book: Optimum Sample Size and Number of Levels in a One-Way Random-Effects Analysis of Variance: The Journal of Experimental Education: Vol 41, No 4 (tandfonline.com). A table of optimum sample size or number of levels for the random effects model is included in the latter paper. I hope these information helps. ... View more

Thank you for your reply and explanation! ... View more

Thank you for your reply! In the past few hours, I searched for information regarding the MEMSIZE option on the web and found a convenient way to change the memory available for a SAS session into 1TB while launching a new SAS session on my computer that is using Windows 10. Step 1: open a folder (any folder will do); Step 2: Paste the following code in the address bar:   C:\Program Files\SASHome\SASFoundation\9.4\sas.exe -memsize 1T For readers not familiar with the meaning of this code, it should be noted that the path is where my SAS is installed. Readers using my code should change that path to the where SAS is installed in their computer accordingly.   Step 3: Press the "Enter" button on the keyboard. And everything is done. A SAS session is launched automatically after you press the "Enter" buttion. But it should be noted that the alteration done in this manner is only valid in this very session. In other words, if you end this session by closing SAS window and launch yet another one with another method (like clicking the SAS shortcut in the Start Menu), then the largest amount of memory SAS can use resumes to the default value, which is usually 2GB. ... View more

What is the correct code to change the memory then? I tried the following code and the log reported an error: -memsize 1T; ... View more

Thank you! ... View more

You can search on the web for papers on this field like Estimating power in (generalized) linear mixed models: An open introduction and tutorial in R | Behavior Research Methods (springer.com). R code is provided in the paper. ... View more

The getoption function seems a useful function. Could you please provide examples on how to use them to check the memory available? I checked SAS Help and found it seems not available as a statement that acts independently like "ODS GRAPHICS ON;". It seems that it must be embedded in an argument like  if getoption('yearcutoff') = '1926' then do; So if I am just launching a new SAS session and want to check out how much memory do I have, how should I use the getoption function to do this? ... View more

All right. I have got it. Thank you for your patient reply! ... View more

Thank you! I took a second look at your reply and have now understood why it was there. ... View more

Thank you for following my reply. Referencing @Tom's code, I have modified mine. It is at @toomanystepsint's discretion to choose the reply of whom as the solution. A reminder for @toomanystepsint is that you can retract the acceptance of one's reply as the solution and accepting another reply as solution afterwards, regardless of whether the second reply is posted by the original solution provider. ... View more

Your code is correct. But I have a question: why is the variable date in the BY statement? ... View more

Please directly post your screenshot or other materials on the forum. We are exposed to the risk of computer virsues when downloading your attachment. ... View more