an experiment is run where 10 people are pulled off the street and asked 4 questions. The data matrix M would be a 10×4 matrix (meaning 10 rows and 4 columns). The datum in row i and column j of this matrix would be the answer of the i ^th person to the j ^th question.

Examples

Arithmetic mean

The design matrix for an arithmetic mean is a column vector of ones.

Simple linear regression

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