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Re: st: RE: generate graph


From   Nikolaos Pandis <npandis@yahoo.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: generate graph
Date   Thu, 3 Nov 2011 00:47:52 -0700 (PDT)

Phil,
 
That looks great and i can change some of the values to get the desired graph!!
 
Many thanks,
 
Nick

From: Philip Ryan <philip.ryan@adelaide.edu.au>
To: statalist@hsphsun2.harvard.edu
Sent: Thursday, November 3, 2011 9:34 AM
Subject: st: RE: generate graph

<<>>

Something like this (grafting onto -sampsi-) ?:

*==== begin code ====*

clear
tempname temp_ss
local sd .75
local pow 0.8
local m1 0.35
local m2 0

quietly {
postfile `temp_ss'  sample_size  alpha  using  my_ss, replace

forvalues alpha = .01(.01).2{
sampsi `m1'  `m2', alpha(`alpha')  power(`pow') sd(`sd')  r(1)
post `temp_ss' (r(N_1)) (`alpha')
} 

postclose `temp_ss'

} 

/* now make use of our new data set */

use my_ss
list, clean abbrev(16)
graph twoway line  sample_size alpha,  ///
ytitle("sample size in each group") xlabel(0(.01).2) ///
lwidth(medthick) lcolor(blue)

*=== end code ===


Philip Ryan


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nikolaos Pandis
Sent: Thursday, 3 November 2011 5:34 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: generate graph

Hi to all.
 
I was wondering if someone could help me generate the following graph:
 
twoway line graph showing on the y-axis: sample size and on the x-axis:
p-value.
 
The objective is to show how the p-value decreases (increases) as the sample
size increases (decreases) given the same effect size and sd
 
Many thanks,
 
Nick

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