demo(PreSummarized) not working

[franciscoss]

Hi. I was trying to plot pre-summarized data, since I have survey weights that I'm taking into account with the survey package.

I couldn't get the likert function to work with my summarized data, so I tried with the included demo: demo(PreSummarized), but it gave me the following error:

Error in as.data.frame(items) : 
  argument "items" is missing, with no default

Do you know what the problem is, or how can I make it work with pre-summarized data?

Thanks,

[gkalvelage]

I ran into the same issue and found a workaround. I'm not sure, why the "items" argument is needed, since the pre-summarized data frame should include a factor with the items as levels. For me, it worked inserting just any string (see below).

If you do so, you'll run into a different error, which arises from a change in 87c5500, if I'm correct:

likert/R/likert.R

Line 60 in a7cb925

names(summary)[1] <- 'Items'

I had to change the column's name to make it work with the plotting function.

Hope that helps.

# devtools::install_github("jbryer/likert")
library("likert")
#> Loading required package: ggplot2
#> Loading required package: xtable

## Using pre-summarized data and no groups from demo(PreSummarized)
data(MathAnxiety)

# does not work
lmass <- likert(summary=MathAnxiety)
#> Error in as.data.frame(items): argument "items" is missing, with no default

# does work: insert any character (which throws a warning only)
lmass <- likert(items = "blank", summary=MathAnxiety)
#> Warning in likert(items = "blank", summary = MathAnxiety): Variable items is not
#> a factor.

## different issue: wrong name of "Items" column in likert.R
names(lmass[["results"]])[1]
#> [1] "Items"

# correct column name to "Item"
names(lmass[["results"]])[1] <- "Item"

# plotting
plot(lmass)

^{Created on 2020-05-17 by the reprex package (v0.3.0)}

Session info

devtools::session_info()
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