qstripchart and qboxplot does not make use of the column names for axeslabels, unlike qviolin



```r
ToothLen.by.Dose <- ToothGrowth[, c("dose", "len")]; head(ToothLen.by.Dose)
qviolin(ToothLen.by.Dose, stat.test = T, col = "dose")

qstripchart(ToothLen.by.Dose)
qboxplot(ToothLen.by.Dose)

```
