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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Dear list members,<br>
<br>
As I noticed that some other people (Bo and Sun) are also longing for the R code of
<span style="font-style: italic;">Mediatio</span>n to be extended to handle hierarchical data, I did my very best to add some lines to the R source code, in order for
<span style="font-style: italic;">Mediation</span> to work with lme models too. At least, I tried, as I am a school psychologist, and not so much a stat programming hero. Unfortunately, I don't seem to be very succesful (well, I don't blame myself, I am not
an expert as many of you are) and I was wondering whether any of you has some ideas on the reasons for the following error message to appear when I use my revised package with my data:
<br>
<br>
> Model4=mediate(Model1, Model2, sims=1000, boot=FALSE, treat="graderetention", mediator="peerrelationship", conf.level=.95, dropobs=TRUE)<br>
Error in as.data.frame.default(x) : <br>
cannot coerce class 'c("lmeStructInt", "lmeStruct", "modelStruct")' into a data.frame<br>
<br>
I have added in Attachment the jEdit file and the tarball file. Lines I added are 43-44; 83; 95-99; 268-272; 278-282; 407-408; 699-700.<br>
<br>
Bo and Sun, did you perhaps succeed in extending the R code succesfully?<br>
<br>
Any advice would be appreciated.<br>
<br>
Kind regards,<br>
Mieke<br>
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<div class="PlainText">------------------------------------------------------------------------------------<br>
Mieke Goos<br>
Centre for Educational Effectiveness and Evaluation<br>
Catholic University of Leuven<br>
Dekenstraat 2<br>
VHI 02.45<br>
3000 Leuven<br>
Belgium<br>
<br>
Tel: (+32)(0)16/32.58.14<br>
email: mieke.goos@ppw.kuleuven.be<br>
url: http://www.steunpuntloopbanen.be/</div>
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