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...on mixed models. SAS Proc NLMIXED can fit simple logistic or Poisson mixed models but the syntax is not specific for generalized mixed models. There can be only one level of random effects. STATA version 7 can fit random intercept models but not more. There are also some standalone programs such as MIXOR by Don Hendeker of Chicago. But it is hard to use a stnadalone program for data analysis efficiently because you have to convert the data set and you lose all the familiar tools for data transformation and graphics. I would appeciate your comments on the following points: 1. Is there a strong nee...

Do Users of Nonlinear Mixed Effects Models Know Whether Their Software Really Works? Lesaffre et. al. (Appl. Statist. (2001) 50, Part3, pp 325-335) analyzed some simple clinical trials data using a logistic random effects model. Several packages and methods MIXOR, SAS NLMIXED were employed. They reported obtaining very different parameter estimates and P values for the log-likelihood with the different packages and methods. We thought it would be interesting to revisit this example using the AD Model Builder random effects module which we feel...

Is there a way to fit mixed proportional odds models in R? -- Using Opera's revolutionary e-mail client: http://www.opera.com/m2/

...) does. > >> logistic or Poisson mixed models but the syntax is not specific for >> generalized mixed models. There can be only one level of random >> effects. STATA version 7 can fit random intercept models but not more. >> There are also some standalone programs such as MIXOR by Don Hendeker >> of Chicago. But it is hard to use a stnadalone program for data >> analysis efficiently because you have to convert the data set and you >> lose all the familiar tools for data transformation and graphics. >> >> I would appeciate your comments on the...