How is this formula derived

slope=

This seems to give me the average ratio of the slope

I know this is one, but why is it needed?

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- Apr 8th 2009, 06:26 PMmanyarrowsslope formula for est. regression equatios
How is this formula derived

slope=

This seems to give me the average ratio of the slope

I know this is one, but why is it needed?

- Apr 11th 2009, 10:32 PMmatheagle
The should be

and then I really don't understand the second part because

, as well as with the y's. - Apr 11th 2009, 11:36 PMmanyarrows
I'm sorry it should be .

As far as the x with the bar over it, I just don't know the Latex command for that, so I subbed in the o figuring everyone would understand. I still amm unclear why it is needed. The second part is just a factor I pulled out of the slope equation from above.