Here is the code:
Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input double csw byte age
-2.8 28
 3.2 28
 3.4 26
-3.4 27
-2.6 29
   4 26
-3.4 27
 2.6 28
 3.2 25
   3 26
   3 25
-3.6 26
 3.4 28
  -4 30
-3.6 31
-3.8 30
-4.4 34
 3.4 33
   3 34
-4.8 33
  -3 30
-3.4 32
-3.8 30
 3.6 34
-3.6 33
-3.8 30
 4.2 34
 3.8 33
-3.6 32
 3.2 34
-3.4 37
 2.6 35
 3.2 39
-3.6 35
 4.6 39
 2.6 36
-3.4 36
   3 36
  -3 37
-2.8 37
 3.2 38
 3.8 35
 3.6 39
-3.4 38
 4.4 39
-4.2 38
 3.2 35
 3.6 38
-4.2 37
 3.6 36
 3.4 39
 4.2 36
-2.8 36
 3.8 36
-3.2 39
  -3 36
-3.6 39
-3.8 37
-3.2 35
-3.6 37
 3.4 39
-3.6 38
 3.8 42
-3.2 40
-2.8 40
 3.6 41
-3.6 40
  -4 40
 3.4 42
-3.4 44
  -4 40
-3.6 42
-3.6 44
-3.6 44
-3.4 40
-3.6 41
-3.4 44
-3.8 40
-3.6 44
-3.6 44
-3.2 42
   4 44
 4.2 40
-3.6 40
-3.6 42
-3.6 43
   3 42
 3.2 42
-3.4 44
 3.8 40
 3.2 43
 3.6 41
-3.2 40
-3.6 43
-3.4 43
  -3 40
 3.4 47
 3.4 48
-3.6 45
-3.6 49
end
twoway dot csw  age ,hori ylabel(,nogrid) xlabel(-5 "5" -4 "4" -3 "3" -2 "2" -1 "1" 1(1)5)  xscale(r(-5(1)-1 1(1)5))