Independent Samples - Survey Reporter Column Proportions Test

Where $p_1$ and $p_2$ are the two proportions, $e_1$ and $e_2$ are the effective sample sizes and ${\pi }_1$ and ${\pi }_2$ are the weighted sample sizes:

$t=\frac{p_1-p_2}{\sqrt{p_{12}(1-p_{12})(e_1^{-1}+e_2^{-1})}}$, where $p_{12}=\frac{{\pi }_1{p}_1+{\pi }_2{p}_2}{{\pi }_1+{\pi }_2}$

where $p\approx 2\mathrm{Pr}(t_{e_1+e_2-2}\ge |t|)$.

Note that if wishing to replicate results from IBM SPSS Data Collection products (including Survey Reporter and Quantum) additional settings need to be modified (see How to Replicate Survey Reporter Significance Tests).