error in likert(…, grouping = grouping)

[andreaphsz]

likert() throws an error, if there is a variable with unused levels, and grouping is used.

library(likert)
library(reshape)

df <- data.frame(matrix(c(1,1,1,1,2,1,2,2), 4))

df[,1] <- factor(df[,1], 1:2)
df[,2] <- factor(df[,2], 1:2)

gr <- c(1,1,2,2)

likert(df, grouping=gr, nlevels=2)

output is:

Error in fix.by(by.y, y) : 'by' must specify uniquely valid columns

[jbryer]

This issue has been fixed and a test was added to the UnusedLevels demo. Problem seem to be more related to using a numeric vector type for the group assignment.

[patilv]

I am having the same problem show up and the example in the demo is also throwing the same error.

[josiahpjking]

Not sure why, but detaching the reshape package solved this for me.

[jbryer]

I just recently updated the package to use reshape2 instead of reshape given that ggplot2 uses the latter now. I do explicitly call reshape2::melt but if reshape is also loaded, there is a conflict somewhere in the namespace. I believe it has to do with the fact that the class type returned by both are the same so the wrong S3 method is being dispatched. My advice, abandon reshape and stick with reshape2. I believe that RStudio and Hadley have done.

[patilv]

Detaching reshape did it for me as well. Thanks for the tip. I believe the reshape2 tasks are now predominantly going to be done using tidyr. So we could go to the gather function to do what melt does. I will take a closer look at the package code sometime soon. Thanks for the great work on this.

[jbryer]

Great! Glad it worked. I finally get around to update to reshape2 and
Hadley has another way of doing things. ;-)

-Jason

On Thu, Nov 12, 2015 at 9:17 AM, Vivek Patil notifications@github.com
wrote:

Detaching reshape did it for me as well. Thanks for the tip. I believe the
reshape2 tasks are now predominantly going to be done using tidyr. So we
could go to the gather function to do what melt does. I will take a closer
look at the package code sometime soon. Thanks for the great work on this.

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Reply to this email directly or view it on GitHub
#16 (comment).

[raynamharris]

Thanks! I detached reshape then loaded reshape2 and all was well

detach("package:reshape", unload=TRUE)
library("reshape2")