Relevel not working in R

Question

I'm currently trying to relevel the following data frame for presentation purposes:

Report      Visual  Audio      Prob
Two Flashes one     MF-C 300   0.43775758
Two Flashes one     MF-C 3500  0.46551515
Two Flashes one     SW-C 300   0.18870707
Two Flashes one     Sw-C 3500  0.31036364
Two Flashes one     SW-MF 300  0.18165657
Two Flashes one     SW-MF 3500 0.23765657
Two Flashes one     SW-ST 300  0.17452525
Two Flashes one     SW-ST 3500 0.32036364
Two Flashes one     SW 300     0.06117172

Here is the code I'm using to relevel:

Prob.Illusion.Total.Mean$Audio = Relevel(Prob.Illusion.Total.Mean$Audio, ref = c("SW 300", "SW-ST 300", "SW-ST 3500", "SW-MF 300", "SW-MF 3500", "MF-C 300", "MF-C 3500", "MF-C 300", "MF-C 3500"))

However, R does relevel successfully but doesn't seem to like this code and gives me these warnings:

Warning messages: 1: In levels<-(*tmp*, value = if (nl == nL) as.character(labels) else paste0(labels, : duplicated levels will not be allowed in factors anymore 2: In levels<-(*tmp*, value = if (nl == nL) as.character(labels) else paste0(labels, : duplicated levels will not be allowed in factors anymore

Any ideas what is going on?

Thanks.

do you mean ?relevel? if so youre not using it correctly. if you replace Relevel with factor and ref with levels, then it would probably work — rawr
relevelonly change the reference level: From the man page: the levels of a factor are re-ordered so that the level specified by ref is first and the others are moved down — xraynaud

Komal Rathi Komal Rathi · Accepted Answer · 2015-03-19T20:49:29

Instead of using relevel, which only lets you set the reference level, you need to set the levels explicitly using:

Prob.Illusion.Total.Mean$Audio <- factor(Prob.Illusion.Total.Mean$Audio, levels = c("SW 300", "SW-ST 300", "SW-ST 3500", "SW-MF 300", "SW-MF 3500", "MF-C 300", "MF-C 3500", "MF-C 300", "MF-C 3500"))

Reference

Relevel not working in R

1 Answers