Apologies if this has been asked before. I am having
trouble
understanding the R mailing list never mind R!
I am relatively new to R having migrated from
Minitab and SPSS. I
have managed to do some more complicated statistics
such as
hierarchical partitioning of variance on an 80,000
record dataset but
have to admit that drawing a simple bar plot I could
do by hand is
proving extremely difficult!
I have Crawley's 'The R book' which is proving a
big help, but still
does not provide me with all of the information I
need.
What I want to do:-
I have a small dataset, with 'rate' as the dependent
variable (y axis
variable) and two groups ('cat' and 'box') which I
have calculated
the mean and standard error for and would like to
display as a bar
plot. I would like to display the standard error for
each group NOT a
pooled standard error (i.e. error bars will be
different heights on
the two bars). In the Crawley book, he just repeats
the same error
bars across all groups, and I don't know how to
specify the different
error for each bar.
What I have managed to do so far:-
-calculate mean and standard error
-plots means with confidence intervals
-plot means as bar plot but with no error bars or
confidence intervals
-everything except what I want to do!
I have learnt a lot about R but it is getting rather
frustrating that
I can do complex GLMs but cannot do a simple plot in
4 hours! I have
migrated to R because I like the way it can do
almost anything and
because I'm trying to go almost completely freeware
as everytime I
move institution I run into trouble with getting
software licenses
which also tend to be expensive. However, I'm not
the most computer
literate person and have grown up with 'menus' and
'windows'.
Any help much appreciated as it will save me much
time and frustration!
Dr. Katherine Jones
Department of Biology,
Carleton University