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Posted this to StackExchange but got no answers but I'm hoping someone here will be able to take a look:
Replying here is fine, I just didn't want to retype the whole lot.
the slope of the line from an online calculator for the regression is:
which is what you got i believe ... so id go with typo.
Thanks, just checking I wasn't going mad. Any idea about the last question?
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youre 'corrections' were not complete
consider the point slope form of the linear regression line:
y = m(x-avgX) + avgY
such that the y intercept is: -m*avgX + avgY
i believe you adjusted the value of m, but did not consider how it affects the overall line outcome.
when i correct for it, using their typoed slope
... i get x=-.30473
Oh thank you, that explains it. Also, someone replied to me on StackExchange explaining that it wasn't at typo and was due to the fact they modelled it differently.
ah, i was wondering a little why you did 1/m for the ELR. I spose we should have had a better definition of what ELR ... temp with respect to altitude would have given us a function whose independant variable was altitude, not temperature.