That fixed it! Thanks to all who replied.
On Thu, Jan 14, 2010 at 9:13 AM, S Ellison <S.Ellison@lgc.co.uk> wrote:

> I think you should rather look at the origin= parameter in barchart. See
>
> ?panel.barchart for a discussion of this exact problem:
> "  origin: the origin for the bars.  For grouped displays with 'stack
> =
>          TRUE', this argument is ignored and the origin set to 0.
>          Otherwise, defaults to 'NULL', in which case bars start at
>          the left (or bottom) end of a panel.  This choice is
> somewhat
>          unfortuntate, as it can be misleading, but is the default
> for
>          historical reasons.  For tabular (or similar) data, 'origin
> =
>          0' is usually more appropriate; if not, one should
> reconsider
>          the use of a bar chart in the first place (dot plots are
>          often a good alternative). "
>
> The result of setting origin is more sensible:
> require(lattice)
> da <- expand.grid(A=c("a","b"), x=1:4)
> da$y <- c(1,5,6,3,2,0,6,0)
>
> barchart(y~x|A, data=da, horizontal=FALSE)
>
> barchart(y~x|A, data=da, horizontal=FALSE, origin=0)
>
> >>> Walmes Zeviani <walmeszeviani@hotmail.com> 14/01/2010 14:49:01 >>>
>
> Rex,
>
> I think this problem can be solved using xlim()/ylim() argument. Look
> at the
> follwing code:
>
> require(lattice)
> da <- expand.grid(A=c("a","b"), x=1:4)
> da$y <- c(1,5,6,3,2,0,6,0)
>
> barchart(y~x|A, data=da, horizontal=FALSE)
>
> barchart(y~x|A, data=da, horizontal=FALSE,
>         ylim=c(0, 1.05*max(da$y)))
>
> At your disposal.
> Walmes.
>
>
>
> Rex C. Eastbourne wrote:
> >
> > When I use barchart (with default formatting options), I get bars
> whose
> > lengths/heights are not proportional to their value. For example:
> >
> > http://drop.io/wbagm6s/asset/capture-png
> >
> > Many of the values in this chart are 1; however, because the blue
> bars
> > extend to the left of the "0" tick mark, those bars appear to
> represent
> > higher numeric values. Is there a way to make the length of the bar
> > proportional to the data value, so that people looking at my chart
> are not
> > misled?
> >
> > Thanks,
> >
> > Rex
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > and provide commented, minimal, self-contained, reproducible code.
> >
> >
>
>
> -----
> ..oooO
>
> ..................................................................................................
> ..(....)... 0ooo...                              Walmes Zeviani
> ...\..(.....(.....)...     Master in Statistics and Agricultural
> Experimentation
> ....\_)..... )../....       walmeszeviani@hotmail.com, Lavras - MG,
> Brasil
> ............
>
> (_/............................................................................................
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