Hi, for this model,

am i supposed to have 1 + 3 + 3 + 2 + 5 = 14 normal equations?

or am i just meant to have 1 + 3 + 3 + 2 = 9 normal equations?

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- May 8th 2010, 09:18 PMDgphrunormal equations
Hi, for this model,

am i supposed to have 1 + 3 + 3 + 2 + 5 = 14 normal equations?

or am i just meant to have 1 + 3 + 3 + 2 = 9 normal equations? - May 8th 2010, 10:04 PMmatheagle
I use matrices

- May 8th 2010, 11:10 PMDgphru
Thanks but im wondering actually how many normal equations am i supposed to find?

Because the way we do it, is we find the error sum of squares of the model and then differentiate it wrt each of the terms i.e. etc.

so so far i have 9 normal equations, but I'm wondering if for the interaction term

which now i realise i didnt put into my question, (and i will after this post) do i differentiate it with respect to etc. ??

please help? - May 8th 2010, 11:21 PMmatheagle
You should have one equation per parameter that you're differentiating with respect to.

- May 8th 2010, 11:30 PMDgphru
- May 8th 2010, 11:52 PMmatheagle
- May 9th 2010, 12:32 AMDgphru