Sent: Sunday, August 1, 2021 5:32 PM To: mudryjm <mudryjm at bluewin.ch> Subject: Re: Variogram / confint prediction in LMM / time prediction some questions from Switerland area I regret that I am not able to answer your questions at this time. It has been a couple of decades since I worked on the nlme package and I have not kept up with the literature. I suggest that you send your questions to the R-SIG-Mixed-Models at R-project.org <mailto:R-SIG-Mixed-Models at R-project.org> mailing list. Some information about the list is available at https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models
On Sun, Aug 1, 2021 at 9:25 AM mudryjm <mudryjm at bluewin.ch <mailto:mudryjm at bluewin.ch> > wrote:
Dear Mr Bates and Pinhero Tks for your incredible packages in R I did my master in statistics (attached). I?m a big fan! However I?m puzzled with several theoretical questions on some topic where I?m struggling; instead of luring for stat input I asks directly WIZARDS!: Variograms (Cressie):P 52 PDF I have done several variograms on my model residuals expecting flat line along (sill flat).However some patient are at sill some on the correlation path-slope. Q:How to interpret? (Two class of patient with biophysical discerpancies? Q:The smoother fitted in graph is the theoretical one (Theoretical variogram based on exp?spherical?)?? Or is it a simple smoother. Q: Is it possible with variogram (within (patient and sampling error) cor + between from LMM variance) to forecast the best time for re-measure? I.e in cholesterol study some authors demonstrated when intra- variability exceed between variability? So measuring on too short intervals has no value.But I don?t know how to proceed Or do you had a good reference.? Fiiting confindance bands on XB+ZU: Q.I try to get con band for predictings patients trajectories. As they is no close form (at least very complex) is the better way to bootstrap some model and fit a bootstrap confint on the 1000 Fitted values? Or do you have a smplier function? Q:If I should predict when time will be reached for a patient his Upper reference limit how do I have to proceed? (back reversing formula?) Page 54 :patients prediction Tks for your help in an old retrained statistician NB Your contribution to staworld is fabulous and inspired me in my daily work since a year! :) Veuillez recevoir mes sinc?res salutations , Sincerely, Mudry Jean-Marie 8 ch du Ch?no 1802 CORSEAUX Switzerland +41.79.708.87.15 +41.21.921.10.18. <https://www.linkedin.com/profile/view?id=AAIAAAQNN6kBw4M_5pbYY8UTDonpSQEhwi-7DHs&trk=nav_responsive_tab_profile_pic> LinkedIn <https://twitter.com/mudryjm> Twitter <https://twitter.com/mudryjm/status/750591764080291840> Last Publication