Hi DavoWW
Thanks a lot for your answer. It works as sweet as sugar for me 
I will add it to my code snippets collection.
In the meantime I have found another solution with describe(...) from the package "psych" which is giving me a lot more, but also undesired information:
dd <- summary(tab["DD"])
ddd<-describe(dd, na.rm = TRUE, quant=c(.25,.75))
stargazer(ddd, type = "html", summary = FALSE, out = "StargazerTestDD3.html")
Strange enough that this above code works with tab["DD"] but not with tab$DD because it throws
$ operator is invalid for atomic vectors
In your post you mentioned there would be a better package for this job. What would be your recommendation?
Anyway, best regards from Germany and Thanks again!
raptorrs