R help - Feb 2021 - Need help using lattice

David,
Is this what you are looking for?
library(lattice)
df <-
expand.grid(site=c("een","twee","drie","vier","vijf"),
                  month=1:12)
df$conc <- rnorm(dim(df)[1])
dotplot(month~conc|site,data=df)

HTH Gerrit