Correlation Test Statistic Formula. The value of the test statistic t is shown in the computer or calculator output along with the p value. ρ spearman rank correlation.
Where t is the test statistic for two means hypothesis testing of variables x 1 and x 2 with t t df x is a combination of x 1 and x 2 and y is the dichotomous variable as in. X i value of x in the sample mean x mean of all values of x y i value of y in the sample mean y mean of all values of y. Press the stat button.
The point biserial correlation coefficient is simply pearson s product moment correlation coefficient where one or both of the variables are dichotomous.
The p value is the combined area in both tails. Type your data into a list and make a scatter plot to ensure your variables are roughly correlated. Multiply each a value by the corresponding b value and find the sum of these multiplications the final value is the numerator in the formula. Scroll right to the calc menu.
