Variance display

[Michael History]

I want to display variance in the summary statistic in Stata.

I am currently using sex as the BY group and then placement on political scale as the summary group.

I get mean, deviation and error but no variance. How come?

I have tried to use the help function to no avail.

[Attaullah Shah]

If you post an example dataset, that will be helpful. In the sort form of summary statistics, the variance is not shown. However, you can use the detail option with sum command. You have shown that you have a grouping variable, in that case, tabstat can be more useful. Let me show one example using the auto dataset.

sysuse auto
tabstat price mpg rep78, stat(N mean sd var semean)

   stats |     price       mpg     rep78
---------+------------------------------
       N |        74        74        69
    mean |  6165.257   21.2973  3.405797
      sd |  2949.496  5.785503  .9899323
variance |   8699526  33.47205  .9799659
se(mean) |  342.8719  .6725511  .1191738
----------------------------------------

With a grouping variable - using foreign as a grouping variable.

tabstat price mpg rep78, stat(N mean sd var semean) by(foreign )

 foreign |     price       mpg     rep78
---------+------------------------------
Domestic |        52        52        48
         |  6072.423  19.82692  3.020833
         |  3097.104  4.743297   .837666
         |   9592055  22.49887  .7016844
         |  429.4911   .657777  .1209067
---------+------------------------------
 Foreign |        22        22        21
         |  6384.682  24.77273  4.285714
         |  2621.915  6.611187  .7171372
         |   6874439  43.70779  .5142857
         |  558.9942   1.40951  .1564922
---------+------------------------------
   Total |        74        74        69
         |  6165.257   21.2973  3.405797
         |  2949.496  5.785503  .9899323
         |   8699526  33.47205  .9799659
         |  342.8719  .6725511  .1191738
----------------------------------------

[Michael History]

If you post an example dataset, that will be helpful. In the sort form of summary statistics, the variance is not shown. However, you can use the detail option with sum command. You have shown that you have a grouping variable, in that case, tabstat can be more useful. Let me show one example using the auto dataset.

sysuse auto
tabstat price mpg rep78, stat(N mean sd var semean)

stats | price mpg rep78
---------+------------------------------
N | 74 74 69
mean | 6165.257 21.2973 3.405797
sd | 2949.496 5.785503 .9899323
variance | 8699526 33.47205 .9799659
se(mean) | 342.8719 .6725511 .1191738
----------------------------------------

With a grouping variable - using foreign as a grouping variable.

tabstat price mpg rep78, stat(N mean sd var semean) by(foreign )

foreign | price mpg rep78
---------+------------------------------
Domestic | 52 52 48
| 6072.423 19.82692 3.020833
| 3097.104 4.743297 .837666
| 9592055 22.49887 .7016844
| 429.4911 .657777 .1209067
---------+------------------------------
Foreign | 22 22 21
| 6384.682 24.77273 4.285714
| 2621.915 6.611187 .7171372
| 6874439 43.70779 .5142857
| 558.9942 1.40951 .1564922
---------+------------------------------
Total | 74 74 69
| 6165.257 21.2973 3.405797
| 2949.496 5.785503 .9899323
| 8699526 33.47205 .9799659
| 342.8719 .6725511 .1191738
----------------------------------------

Thank you! Worked like a charm.