S1 — Value for s1. Provide accurate numbers for a reliable Sp2. Example: 0.1.
S1 is required
S2 — Value for s2. Provide accurate numbers for a reliable Sp2. Example: 0.1.
S2 is required
N1 — Value for n1. Provide accurate numbers for a reliable Sp2. Example: 0.1.
N1 is required
N2 — Value for n2. Provide accurate numbers for a reliable Sp2. Example: 0.1.
N2 is required
Pooled variance.
Formula
sp2 = ((n1-1)*s1**2+(n2-1)*s2**2)/(n1+n2-2)