- Thread starter
- #1

#### GreenGoblin

##### Member

- Feb 22, 2012

- 68

"state the assumptions on the errors ei to justify a least squares fit"

? So is this just that E(ei)=0, i cant see what else is a 'must' for this? what about that they are normally distrubited? i know the properties of the errors but what does it mean state the assumptions?

"obtain the least squars estimators a* and b*"

right but there is no data set? so does this just mean give the formulae for the estimators? is this just simple write it down book work or is there something to do here? do you think an examiner must give full mark if you say just a* = yBAR - b*xBAR, b* = Sxy/Sxx?. I dont know what else they can be asking. i have no official solution to it.

t

"suggest an unbiased estimato of a + 10b".

now this one just annoys me the most since we have E(a*)=a and E(b*) = b, with the linearity of exectation, this is just going to be a* + 10b*? so there really is nothing to do in the whole question?

i am just lost if there is some calculations to actually do here since this is a pretty valuable question on exam paper and there appears to be no work to do..