Plotting percentage of variables

[Collin James]

Hello,

I have two variables and two groups in my data that I want to plot the percentages of. So, I have kids who are either "screened in" or "screened out" measured by a 0 1 dummy called "screenedin." I also have two variables: exp_risk_screenout and exp_risk_screenin. These are also dummy variables that show, for instance, you are exposed to risk and also screened in you will get a 1 for exp_risk_screenin. I want to plot these variables together so that it would show two bars, one for screened in and one for screened out and it would show the percentages like 27% have a 1 for exp_risk_screenout and 10% have a 1 for exp_risk_screenout. I have put data below. Thanks -CJ

* Example generated by -dataex-. For more info, type help dataex
clear
input float(screenedin exp_risk_screenout)
0 0
0 0
0 0
0 0
0 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
0 0
0 0
0 0
0 0
0 0
1 0
0 0
0 0
0 0
0 0
0 0
0 0
0 1
1 0
0 1
1 0
1 0
0 0
1 0
0 0
1 0
1 0
0 0
0 0
0 0
0 0
0 0
1 0
0 1
0 0
1 0
1 0
0 0
1 0
1 0
1 0
0 1
1 0
1 0
1 0
1 0
0 0
1 0
1 0
1 0
1 0
1 0
1 0
0 1
0 0
0 0
0 0
0 0
0 1
0 0
1 0
1 0
0 0
0 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
1 0
0 0
0 1
1 0
0 0
1 0
0 0
1 0
1 0
0 0
0 0
0 0
1 0
1 0
1 0
1 0
0 0
1 0
1 0
end

[Nick Cox]

The data example shows two variables whereas you refer to four. Also, the example seems jumbled

27% have a 1 for exp_risk_screenout and 10% have a 1 for exp_risk_screenout.

To move forward, let's fake a dataset with 4 binary indicator variables with values (0, 1), two which are notionally outcomes and two notionally controls. Then it's elementary but fundamental that

mean of binary outcome == proportion of outcomes that are 1

and showing percents instead of proportions is just cosmetic.

[CODE}
* fake dataset
clear
set obs 100
set seed 2803
gen X1 = runiform() < 0.7
gen X2 = runiform() > 0.6
gen Y1 = runiform() > 0.5
gen Y2 = runiform() > 0.4

* graph bar defaults to showing means
graph bar Y1 Y2, over(X1)

graph bar Y1 Y2, over(X1) over(X2)
[/CODE]


To see percents instead, use something like

yla(0 0.25 "25" 0.5 "50" 0.75 "75" 1 "100") ytitle(% of whatever)

as extra options,

To swap the order of the bars,use statplot from SSC; statplot is a good search term to find discussions here.

If that is not what you want, please come back with more precise information.