Re: [R] Frustration to get help R users group

2013-04-23 Thread John Fox
Dear Champak Ishram, It's not surprising that what you did doesn't work because the model specification and the arguments that you employed bear no relationship that I can discern to the sem() function in the sem() package. I think that you're probably confusing the sem package with something e

Re: [R] Frustration to get help R users group

2013-04-22 Thread Jeff Newmiller
This is dangerously close to a statistics theory question, which would be off-topic on this list. In any event, your example is definitely not reproducible (no sample data) [1]. Now might also be a good opportunity for you to read the Posting Guide mentioned at the bottom of every message on thi

[R] Frustration to get help R users group

2013-04-22 Thread Champak Ishram
Dear R users/developers I requested help to solve the problem of formulating Multivariate Sample selection model by using Full Information Maximum Likelihood (FIML)estimation method. I could not get any response. I formulated the following code of FIML to analyse univariate sample selection proble