calculate difference between two sets of data how to find the difference between the two tests? how to calculate percentage difference between two set of data? how can i tell the difference between a set of data how do you get the percent difference between sets of data what is the difference in percent difference between sets how is the difference in percentage between two sets of data? how to calculate the difference between two sets of data what is difference in percentage mean how do you measure the difference between a pair of sets of data how do you calculate percentage difference calculate percent difference between two sets of data calculate percentage difference how do you find percent difference how to find the difference of two sets of data how to calculate comparison in percent difference p value between two sets calculate percentage difference between results what percentage are the points in dsmc? calculate the percentage difference of the data