- #1

- 2

- 0

1. Must A be a square matrix?

2. Must (X'X) be a square matrix?

3. Must X be a square matrix?

4. Show whether matrix A is an idempotent matrix (i.e. that AA=A)

Thanks.

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- Thread starter BigDave48
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- #1

- 2

- 0

1. Must A be a square matrix?

2. Must (X'X) be a square matrix?

3. Must X be a square matrix?

4. Show whether matrix A is an idempotent matrix (i.e. that AA=A)

Thanks.

- #2

mathwonk

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- #3

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To be more clear: I is an identity matrix

Questions 1,2,and 3 are essentially Yes/No with a provided proof or explanation.

Does this help, clarify?

Thanks.

- #4

mathwonk

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come on man.

- #5

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"Let A= I - X(X'X)inverseX' to clarify: '=transpose; inverse of quantity (X'X)"

Sorry but it's incomprehensible.

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