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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

I find many problems *very very* tough to do in Casella's probability textbook, which reveals knowledge not covered in his content.

It seems a convention that maths teachers leave the hardest part in problems.

Unfortunately I am not a guy relying on answer manuals.

Geeeeeeeeeeeeeeeeee!

**X'(y-Xβ)=0**

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 83,211

Hi George,Y;

Casella's probability textbook,

Which one?

It seems a convention that maths teachers leave the hardest part in problems.

I am forced to agree. I have seen some where the problems are undoable even if you are familiar with the chapter.

**In mathematics, you don't understand things. You just get used to them.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

George Casella's*Statistical Inference*

I guess it is too hard for my self study

**X'(y-Xβ)=0**

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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

**X'(y-Xβ)=0**

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