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st: RE: RE: RE: St: problems with gridlines in Stata 8.2 graphs


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: St: problems with gridlines in Stata 8.2 graphs
Date   Mon, 24 Nov 2003 16:44:34 -0000

Thanks. That greatly clarifies the problem, which
I confirm. What's crucial is that with integer-valued
variables it is possible that many grid values are equal
to the variable values.

How about offsetting your -xtic()- set
by 0.5 week? In this example,

... xtic(0.5(1)8.5, grid notick)

Nick
n.j.cox@durham.ac.uk

Matthew Sydes

> The data is indeed weekly - it relates to the number of
> patients (and
> proportion of patients) undergoing follow-up each week
> after randomisation
> on a randomised controlled trial by trial arm.  The graph
> is being produced
> for quality assurance purposes.  Patients are due to be
> seen every 13 weeks,
> hence the choice of gridline.
>
> I found it very interesting that you do not seem to
> experience the same
> problem.  I should be interested in displaying to you a
> copy of the graph,
> and if you wish, providing you with the small dataset from
> which the graph
> was formed.  Due to both the confidentiality of the data
> and the prohibition
> of files on the list I realise I cannot do this at this stage.
>
> Instead, I have constructed a small example that
> demonstrates the problem
> when I run it:
>
> clear
> input a b c x
> 3 4 5 1
> 2 3 6 2
> 3 5 8 3
> 4 5 9 4
> 5 6 10 5
> 6 3 8 6
> 1 4 9 7
> end
> twoway (line a x,yaxis(1) c(J)) (line b x, yaxis(1) c(J)) (line c x,
> yaxis(2) c(J)), xtick(0(1)8,grid)

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