I'm using the R Likert package to generate graphs, which I've used for years but have never come across this bug.
My Likert summary looks fine (generated using likert::likert(dat, grouping = dat$group) :
| Group | Item | Strongly Disagree | Disagree | Slightly Disagree | Slightly Agree | Agree | Strongly Agree |
|---|---|---|---|---|---|---|---|
| Group 1 | Item 1 | 0 | 0 | 0 | 0 | 20 | 80 |
| Group 1 | Item 2 | 0 | 0 | 0 | 0 | 20 | 80 |
| Group 2 | Item 1 | 0 | 0 | 0 | 10 | 40 | 50 |
| Group 2 | Item 2 | 0 | 0 | 0 | 20 | 60 | 20 |
However, this will not plot:
plot(likert::likert(dat, grouping = dat$group)
Error in seq_len(n) : argument must be coercible to non-negative integer
I'm pretty sure it relates to the grouping/and or the skew in the data, as I can generate a plot for each Group individually no worries, or if I artificially create a new row in my dataset and add a single Strongly Disagree to each item and group, then it works fine, producing the grouped plot with both items?!?!
This only occurs for the bar type, it doesn't happen if I set the density plot option plot(q_ab.s, type = "density")
I've also noticed that if I produce any plot with likert() that has an unused level (common with the small samples I work with), the formatting is totally weird, with a big empty box at the top. I wonder if this is related?
So confused. Any suggestions would be really helpful.