Correlation

[Lawrence oyenpemi]

I found out that the correlation coefficient value for a simple correlation between two variables has the same value as in the multiple correlations, Why?
X_{1 correlates} X₂ = 0.833

Also when we carried out the multiple correlations
X_{1 correlates} X_{2 correlates} X<sub>3
0.833, 0.333

Which is the same value?</sub>

[George Ford]

what commands are you using?

if just

correl x1 x2

correl x1 x2 x3

then they should be the same.