Please enter the number of NonParental Ditypes (NPD), TetraTypes (TT), and Parental Ditypes (PD)
into the appropriate spots. If you wish to clear your data, then
click on the 'reset' button. When you are done entering your data, click on the 'submit' button. The
program will output the results along with another blank data entry table at the bottom. You can use this
blank table to perform the same analysis for other tetrad data.