Just combine all the data and run a single regression!!
Actually, if you want to have identical slopes and different
intercepts you can pool the data and regress y on x and three dummy
(0/1) variables indicating which set the observation came from. (Omit
the constant term if you do this.)
-Dick Startz
On 08 Oct 2000 18:59:36 GMT, [EMAIL PROTECTED] (Stanley110) wrote:
>Assume I have three sets of x,y data. I fit each by least-squares to a straight
>line. I determine that the three fitted lines are homogeneous and
>indistinguishable at a certain significance level. I want to express the slope
>(of the three) as a single point estimate and as a confidence interval. What is
>the formula for doing this?
>
>Please reply to this newsgroup and to the writer at <[EMAIL PROTECTED]>.
>
>Thank you for your help.
>
>stan alekman
----------------------
Richard Startz [EMAIL PROTECTED]
Lundberg Startz Associates
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