# Comparison of two proportions

Comparison of Two Proportions

by Sultan

Z test comparison of two proportions:

To compare two proportions the best software you can use is MedCalc. It easily

calculates from inputting only four Numbers.First calculate percentage for your data.

Then run Medcalc software.

Test
 ·                    Comparison of two Proportions
In the box enter data for the 1st set.   Data in percentage:   Proportions %:  _79

Enter the Number of cases (pop) for the 1st set of Data: Number of cases:_120

Enter the Data for the second using same Method

In the box enter data for the 2nd set. Data in percentage: Proportions %:     _65

Enter the Number of cases (pop) for the 2nd set of data: Number of cases:_135

Press the Test button.

It will look like this

If the result is less than 0.05 then there is significant difference in the two

proportions. In this case the P value is 0.0195 which is less than 0.05

which mean that there is significant difference in both proportions.The

difference for this proportion is 14.0% and 95% confidence interval for

this difference.