I’ll try that. Thank you again.
From: Richard M. Heiberger
Date: Tuesday, February 2, 2021 at 5:20 PM
To: Parkhurst, David F. , r-sig-mac@r-project.org
Subject: Fw: Question about stripchart
months<-c("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")
monames.factor <-
months<-c("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")
monames.factor <- factor(monamescon$monames, levels=months)
stripchart(conc~monames.factor, data=monamescon, vert=TRUE)
read the help file
?factor
and see that the levels factor must contain unique values.