[R] Dot plot - equivalent of MINITAB

Dr. S. B. Nguah sbnguah at yahoo.com
Fri Sep 26 14:33:59 CEST 2008


Have you tried the dotplot() function in the package epicalc? I think it
does what you want.


kerfuffle wrote:
> hi folks,
> Bit of a newbie, but I've spent a fair bit of time looking for an answer
> on this, with no joy.  Can anyone help me?  
> Dataset: A single column of values in a csv file (eg. 52, 53, 54, 85, etc)
> Goal: In Minitab, you have what they call a dot plot.  It's a histogram,
> where a single dot represents a set of identical values (eg. 57, 57, 57
> would be one dot).   Multiple dots are stacked on top of each other (as if
> gravity was affecting them). The advantage is that outliers are very
> visible (since a single 155 still gets a single dot).  The net effect is a
> rug plot, but in the main portion of the plot, not just on the axis. 
> Tried: I've played with dotchart and dotchart2 with no joy (eg.
> dotchart(nc$bac) (where nc is the dataset and bac is the column header). 
> They do provide multiple dots (so that ten values of 57 are given 3 dots)
> but these overlap and aren't arranged in a logical way.  Sometimes a
> single dot has a large y-value, sometimes it isn't.  As a result of this
> non-gravitational effect, it doesn't look like a histogram at all.  It's
> also strange that the background of the plot is stripy.  This implies I'm
> doing something very wrong, but don't know what.  I had a look at the plot
> galleries, and didn't see anything else that looked like what I wanted
> (except the rug plots).
> thanks! (and apologies if I've missed something blatant)
> Paul

Blay S
Kumasi, Ghana.
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