test.prop2 {statpsych} | R Documentation |
Computes a continuity-corrected z test for a difference of proportions in a 2-group design.
test.prop2(f1, f2, n1, n2)
f1 |
number of group 1 participants who have the attribute |
f2 |
number of group 2 participants who have the attribute |
n1 |
sample size for group 1 |
n2 |
sample size for group 2 |
Returns a 1-row matrix. The columns are:
Estimate - ML estimate of proportion difference
z - z test statistic
p - p-value
Snedecor GW, Cochran WG (1989). Statistical Methods, 8th edition. ISU University Pres, Ames, Iowa.
test.prop2(11, 26, 50, 50) # Should return: # Estimate z p # -0.3 2.899726 0.003734895