How to find the number of required data - Correlation with 4 variables

M

Moriks

#1
Dear friends,
I wanna find a correlation with 4 variables Nu=f(a,b,c,d).
The parameters vary in the ranges:
a1<a<a2,
b1<b<b2,
c1<c<c2,
d1<d<d2.
My question is that how can I find the required number of values of Nu (number of series of data) to find the correlation?

Thanks.
 
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