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st: RE: tabstat, by(): switching variables from row to columns


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: tabstat, by(): switching variables from row to columns
Date   Mon, 14 Aug 2006 12:39:18 +0100

I think there are several ways to do what 
you want so long as it is, or is equivalent 
to, transposing a matrix. 

Consider 

. sysuse auto, clear
(1978 Automobile Data)

. tabstat trunk turn mpg, by(rep78)

Summary statistics: mean
  by categories of: rep78 (Repair Record 1978)

   rep78 |     trunk      turn       mpg
---------+------------------------------
       1 |       8.5        41        21
       2 |    14.625    43.375    19.125
       3 |  15.26667  41.06667  19.43333
       4 |      13.5      38.5  21.66667
       5 |  11.45455  35.63636  27.36364
---------+------------------------------
   Total |  13.92754   39.7971  21.28986
----------------------------------------

I think you want this transposed. One way 
to do it is 

. tabstat trunk turn mpg, by(rep78) save

Summary statistics: mean
  by categories of: rep78 (Repair Record 1978)

   rep78 |     trunk      turn       mpg
---------+------------------------------
       1 |       8.5        41        21
       2 |    14.625    43.375    19.125
       3 |  15.26667  41.06667  19.43333
       4 |      13.5      38.5  21.66667
       5 |  11.45455  35.63636  27.36364
---------+------------------------------
   Total |  13.92754   39.7971  21.28986
----------------------------------------

. tabstatmat temp

temp[6,3]
           trunk       turn        mpg
    1        8.5         41         21
    2     14.625     43.375     19.125
    3  15.266667  41.066667  19.433333
    4       13.5       38.5  21.666667
    5  11.454545  35.636364  27.363636
Total  13.927536  39.797101  21.289855

. matrix temp = temp'

. mat li temp, noheader

               1          2          3          4          5      Total
trunk        8.5     14.625  15.266667       13.5  11.454545  13.927536
 turn         41     43.375  41.066667       38.5  35.636364  39.797101
  mpg         21     19.125  19.433333  21.666667  27.363636  21.289855

Here the key element is -tabstatmat-, which you can install from 
SSC. In practice, you might want to tune the -matrix list-, e.g. 
by specifying a -format()-. 

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

Manuel Diezi
 
> using tabstat var1 var2 var3, by(var4): is there a 
> possibility to switch 
> rows and columns, ie to have var4 displayed in columns rather 
> than in rows?

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