Peter Ho
2002-Aug-19 11:45 UTC
[R]: Bug in Error() and the use of Error() for repeated measures with more than 2 fa ctors
I forgot to mention that this analysis was carried out using the Windows version . Perhaps this problem is windows specific. Peter Peter Ho wrote:> Prof. Ripley, > > I am sending this to you again, as the first one was undelivered. > > > Peter > > ripley at stats.ox.ac.uk wrote: > > >>> There is no intended limit, but there was a bug fix in 1.5.0. If this >>> is using 1.5.x, could you send me an example that malfunctions? >>> >>> >> >> > > I have attached the .Rdata file with the dataframe > simulation.6batches.aovdata. The scripts are the same ones used in the > previous email > > This analysis was carried out using: > > R : Copyright 2002, The R Development Core Team > Version 1.5.1 (2002-06-17) > > > > Peter > > > >>> Brian >>> >>> On Wed, 14 Aug 2002, Peter Ho wrote: >>> >>>>> I have been trying to analyse an unreplicated repeated measures >>>>> 2-level >>>>> factorial design with 11 factors using aov() with Error(), similar to >>>>> that described in "Notes on the use of R for psychology >>>>> experiments and >>>>> questionnaires" by Jonathan Baron and Yuelin Li (see the example of >>>> >>> Hay's) >> >>>>> >>>>> I have found that there seems to be a limit, in the number of >>>>> factors in >>>>> Error() . For example, the following worked : >>>>> >>>>> aov(CV ~(Twb+Plb+Psb+tinsb+tseedb+Tmb+Mcb+Mom0b+Mom1b+Mom2b+Mom3b)3 + >>>>> Error(Batch / >>>>> (Twb+Plb+Psb+tinsb+tseedb+Tmb+Mcb)),simulation.6batches.aovdata) >>>>> >>>>> but not: >>>>> >>>>> aov(CV ~(Twb+Plb+Psb+tinsb+tseedb+Tmb+Mcb+Mom0b+Mom1b+Mom2b+Mom3b)3 + >>>>> Error(Batch / >>>>> (Twb+Plb+Psb+tinsb+tseedb+Tmb+Mcb+Mom0b+Mom1b)),simulation.6batches.aovdat >>>>> >>>> >>> >> > a) > >>>>> >>>>> which I suppose should be the right way to code the strata.formula >>>>> for >>>>> 11 fixed factors. Returned the following reply after running this >>>>> script: >>>>> >>> >>> >>>>>> >Error in eval(expr, envir, enclos) : couldn't find function "Error" >>>>> >>>> >>>> >>>>> >>>>> The only difference between the two scripts is the second one >>>>> contains >>>>> all 11 factors. Is this a bug? Or should I be using lme() or some >>>>> other >>>>> function when the number of factors is greater than the "limit"? >>>>> >>>>> I would also like to hear some views as to whether Error() should be >>>>> used for repeated measures, pro & cons,etc? I have found differing >>>>> views >>>>> in books. For example, Neter et al "applied linear statistical >>>>> models " >>>>> uses simply the combined treatment by subject interaction mean square >>>>> when testing main effects and their interactions. They do state >>>>> that the >>>>> relaxation of the assumptions of a repeated measures model can be >>>>> made >>>>> by the inclusion of first-order interaction between each factor and >>>>> subjects in the model. However, this still falls short of the ideas >>>>> suggested with using Error() for testing.On the other hand, >>>>> Mead's "the >>>>> design of experiments puts repeated measures in the same chapter with >>>>> split unit design, which are multistratum design. Jonathan Baron's >>>>> and >>>>> Yuelin Li's document also references a number of books on this >>>>> matter. >>>>> >>>>> I know that this point is not really suitable for r-help, but it is >>>>> related indirectly with regard to the use of strata.formula in >>>>> Error(). >>>>> >>>>> >>>>> Any comments would be grateful >>>>> >>>>> >>>>> Peter Ho >>>>> ISR-Porto >>>>> >>>>> >>>>> >>>>> -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- >>>>-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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