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...6 16:39:09 1998 Timezone is UTC+1.0 Domain=[CIV-PCNS] OS=[Unix] Server=[Samba 1.9.18p2] security=share SMBtconX failed. ERRSRV - ERRbadpw (Bad password - name/password pair in a Tree Connect or Session Setup are invalid.) Perhaps you are using the wrong sharename, username or password? Martin Bosker University Of Twente http://www.utwente.nl/ Center for Information Services. M.Bosker@CIV.UTwente.NL Postbus 217 tel: +31 53 489 2333 7500 AE ENSCHEDE fax: +31 53 489 2383 THE NETHERLANDS

...r(test.result ~ homework + Sex -1 + (1 | School)) Suppose that I suspect the error terms in the predicted values to differ between men and women (so, on the first level). In order to model this, I want the 'Sex'-variable to be random on the first level, as described in Snijders & Bosker, page 110. Does anybody know if this is possible and how this can be done using R? Many thanks in advance. Rense Nieuwenhuis PS. Please excuse me for not providing a self-contained example. I couldn't find a data-set in the lme4-package that fitted my question. [[alternative HTML versio...

...ariables are nested in a grouping variable of about 100 groups, which is nested in another grouping variable of 2 groups . I have tried this lme.model <- lme(respVar~expVar1, data=myData, random = respVar1+... +respVar20| groupingVariable_level2,na.action=na.omit) As i understood Snijders and Bosker, with that i have a fixed effect of expVar1 on respVar and a random effect of all the others explanatory variables. They are also nested in grouping Variable level 2. Now my question is, if this is the correct term and how do i include the groupingVariable 3 into my model ? As you can see, i jus...

Hello, I've had no luck finding an R package that has the ability to estimate a Tobit model allowing for heteroskedasticity (multiplicative, for example). Am I missing something in survReg? Is there another package that I'm unaware of? Is there an add-on package that will test for heteroskedasticity? Thanks for your help. Cheers, Alan Spearot -- Alan Spearot Department of Economics

Greetings- I'm working through Pinheiro and Bates' _Mixed Effects Models in S and S-Plus_ using R (1.3.1 for linux). On page 13 (okay, so I haven't got that far :)) is: plot.design( ergoStool) which returns on my system: > plot.design(ergoStool) Error: couldn't find function "plot.design" any ideas? Thanks.

This is a covariance calculation question so nothing to do with R but maybe someone could help me anyway. Suppose, I have two random variables X and Y whose means are both known to be zero and I want to get an estimate of their covariance. I have n sample pairs (X1,Y1) (X2,Y2) . . . . . (Xn,Yn) , so that the covariance estimate is clearly 1/n *(sum from i = 1 to n of ( X_i*Y_i) ) But,