Four Methods for Computing the Deviation SSCP

Method 1

Raw Score Matrix

Compute Mean Vector

Create Mean Matrix

Compute Deviation Score Matrix

Compute Deviation SSCP

Method 2

Raw Score SSCP Matrix

Total Vector Vector

Compute Product

Adjust by n

Compute Deviation SSCP

Method 3

Create Mean Matrix

Compute Cross Product of Mean Matrix

Compute Deviation SSCP

Method 4: Using Stata

input v1 v2
3 7
2 5
1 3
5 4
4 6
end

matrix accum dsscp = v1 v2, deviations noconstant

matrix list dsscp

symmetric dsscp[2,2]
    v1  v2
v1  10
v2   3  10

matrix list dsscp, nohalf

symmetric dsscp[2,2]
    v1  v2
v1  10   3
v2   3  10

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