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
> [email protected]
>
> 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 Gau�-distribution
> > without logarithmusnaturalis it is lognormal distribution -
> > it is easier to reach convergence with Gau�-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
>
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
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