Message-ID: <CADsEwSdLUbnNjnUYALdycEODBknqd5L1PDEv9WNHbXZtHQ8N-Q@mail.gmail.com>
Date: 2020-05-02T23:30:49Z
From: Yousri Fanous
Subject: possible issue with scatterplot function in car package
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
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