Dear Yousri,
Yes, this is clearly a bug, and almost surely a long-standing one. We'll fix it
in the next release of the car package.
BTW, stringsAsFactors defaults to FALSE in R 4.0.0 (and you don't use the ch
variable in the example). Also, although it has no bearing on the bug, I'd
generally prefer
scatterplot(y ~ x, data=aa, smooth=FALSE, grid=FALSE,
frame=FALSE, regLine=FALSE, xlim=c(0, 8))
Thank you for the bug report,
John
-----------------------------
John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
Web: http::/socserv.mcmaster.ca/jfox
> On May 2, 2020, at 7:30 PM, Yousri Fanous <yousri.fan...@gmail.com> wrote:
>
> library (car)
>
> aa <- data.frame(x=c(2, 5, 6, 7, 8),
> + y=c(5, 10, 9, 12, 11),
> + ch=c("N", "Q", "R", "S", "T"),
> + stringsAsFactors=FALSE)
>
> scatterplot(aa$x,aa$y,smooth = FALSE, grid = FALSE, frame = FALSE,regLine=F)
>
> Both x and y boxplots are correct
> and in particular the median of the x box is at 6 which is confirmed
>
>> median(aa$x)
> [1] 6
>
> Now I do only one addition to the scatterplot: I add xlim
>> scatterplot(aa$x,aa$y,smooth = FALSE, grid = FALSE, frame =
> FALSE,regLine=F,xlim=c(0,8))
>
> This causes the boxplot on x-axis to be in error:
> 1) the lower whisker starts now from zero
> 2) the median is between 4 and 6 and no longer at 6 as before
>
>> sessionInfo()
> R version 3.6.3 (2020-02-29)
> [1] car_3.0-7
>
> [[alternative HTML version deleted]]
>
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