How can I calculate the sample mean and sample variance

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Ihor 2022-12-4

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回答： RAGHUNATHRAJU DASHARATHA 2022-12-4

采纳的回答： RAGHUNATHRAJU DASHARATHA

I have a pseudo-random matrics M, sizes K-by-N. How can I calculate the sample mean and sample variance:

1) for each column,

2) for the whole matrix?

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Answer 1

RAGHUNATHRAJU DASHARATHA 2022-12-4

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A per my understanding you want to calculate mean and variance for each column and whole matrix.

I'll demonstrate it using below example

a=randi(10,3) % generates pseudo random matrix
a = 3×3
     3     2    10
     5    10     3
     8     4     3
%Mean and Variance for each column
[V,M]=var(a)
V = 1×3
    6.3333   17.3333   16.3333
M = 1×3
    5.3333    5.3333    5.3333
%Mean and Variance for whole matrix
[b,c]=var(a,0,"all")
b = 10
c = 5.3333