[R] tapply changing order of factor levels?

S Ellison S.Ellison at lgc.co.uk
Wed May 6 16:25:25 CEST 2009

The problem is in the code.

When you say
>> mysummary<-tapply(myfactor,mydata,length)
>> mysummary

you have used mydata as a factor and myfactor as  the data.

tapply has (correctly) used the ordered labels in the grouping factor
(mydata) to label its output.

If you did what you probably intended:
tapply(mydata, myfactor,length)

you'll get the order you expected.

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