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Re: st: RE: improvement


From   "Andreas Aschbacher" <aa_surf@gmx.at>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: improvement
Date   Wed, 11 Feb 2004 14:07:07 +0100 (MET)

method of : autocode ... is what I looked for,
because creating two columns simultaneously is possible
in short time.
method of floor and ceil was good in learning Stata-features - thanks
andreas aschbacher


 As indicated in replies to similar questions 
> on 6 November and 12 December, there is no 
> need to loop. Create a variable with your 
> classes and then use the tabulation command
> of your choice. 
> 
> Edwin Leuven recommended -autocode()-. 
> 
> Another possibility is to use -floor()-. 
> 
> For example: 
> 
> gen lower = 0.05 * floor(pos/0.05) 
> bysort lower : gen count = _N 
> tabdisp lower, cell(count) 
> 
> to display midpoints as here 
> 
> gen midpoint = lower + 0.025 
> tabdisp midpoint, cell(count)  
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
> Andreas Aschbacher
> 
> > we consider small (not infinitesimal) dosis-intervals and the 
> > number of persons who are exposed
> > to these intervals - the following little program shows how 
> > to count the number of persons in certain  intervals :
> > 
> > /pos is ln(dosis-value) because then it seems to be Gauß-distribution
> > without logarithmusnaturalis it is lognormal distribution -
> > it is easier to reach convergence with Gauß-formula in
> > most cases /
> > 
> > local i = 3
> > while `i' <= 20 {
> >         count if pos >= `i' & pos  < `i' + .05  
> >         display
> >         local i = `i' + .05
> > }
> > *  3           -            3.05                ->  3.025
> > *  3.05      -            3.1                  ->  3.075
> > *  3.1        -            3.15                ->  3.125
> > *  3.15      -            3.2                  ->  3.175
> > *  3.2        -            3.25                ->  3.225
> > *  3.3        -            3.35                ->  3.325
> > 
> > this program counts and you get  also zero if there is no 
> > value in interval
> > -
> > with these values I can obtain the following ascii-text-file :
> > 
> > Ascii-Text-file :  
> > x              y      x...dosis-value in radioactive measurement 
> >                        y...number of counts 
> > 3.025    1                       ->for example  :
> > 3.075    2 ...............   two counts in interval 3.05  to 3.1
> > 3.125    4
> > 3.175    7
> > 3.225    6
> > 3.275    5
> > 3.325    10
> > 3.375    13
> > 3.425    22
> > 3.475    13
> > 3.525    24
> > 3.575    41
> > 3.625    41
> > 3.675    60
> > 3.725    67
> > 3.775    81
> > 3.825    98
> > 3.875    143
> > 3.925    162
> > 3.975    181
> > 4.025    241
> > 4.075    268
> > 4.125    301
> > ... and so on
> > 
> > my question : is there a way to get x-column and y-column
> > simultaneously in a sheet(ascii) during counting ? -
> > because I start my little counting-program and get the counted values
> > on results-screen with one blank line after each count 
> > value,then I import
> > in
> > excel with copy/paste and add x-column after deleting all blank lines
> > with a macro. complicated way isn't it ? then I have 
> > ascii-sheet with x-and
> > y-
> > column by copy and paste from excel-
> > each help will be appreciated very much            andreas
> 
> *
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> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
> 

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