On 24/06/2008, at 8:10 AM, Daniel Folkinshteyn wrote:
on 06/23/2008 03:40 PM Thomas Frööjd said the following:
<SNIP>
2. Scale the data so they can be plotted on the same axis. The
reference dataset has around 20 000 observations and my data from the
clinic only around 3000 so I have to fix this otherwise the plot of
the reference datset will be much bigger in the graph.
if you do a density plot (see ?density in R), it will automatically
be scaled. if you want the histogram scaled too, then after
calculating the histogram frequencies, multiply them by a ratio of
numberofobs for your data, and number of obs for reference data
(i.e.: NOBS_yourdata / NOSB_refdata)
I don't understand this. Why not just get hist() to plot on the
density scale,
thereby making its output commensurate with the output of density()?
The hist() function will plot on the density scale if you ask it
to. Set freq=FALSE
(or prob=TRUE) in the call to hist.
cheers,
Rolf Turner
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