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April 2, 2020 at 5:32 pm
Just tried calculating example 1, but the example uses units in hundreds, while the example answer seems to be using units in thousands. Am I missing something here?
When calculating with units in 100s I get y=32.857+0.068x, while using units in 1000s I get the same answer as the example answer.
Really sorry to be wasting your time if this is an error on my part.
February 29, 2020 at 4:29 pm
I’ve noticed a couple of errors in the table being used here, so I can’t check my workings against this – the sum of Y is 409 not 420 and 54×54 is not 24225 as stated but 2916 and I can’t work out how the Sum of Y squared has ended up as 26550. Do you know where I could find other worked examples of this?
Ken Garrett says
February 29, 2020 at 6:10 pm
I’m sorry about this. It’s been there for some years and you are the first to notice!
The same example is used in our notes and it is also wrong. I will correct it there and have new notes uploaded as soon as possible.
Thanks for reporting it.
June 6, 2019 at 3:16 pm
Hi, I am looking at the calculation of A and B in linear regression. You explained the formulas well, except what “n” stands for. Can you clarify please? Many thanks!
June 6, 2019 at 6:32 pm
n is the number of pairs of readings.
November 4, 2017 at 10:58 pm
It simply keeps figures smaller when doing the workings. Things have to be converted back at the end, or realise x is in 00s.
November 4, 2017 at 3:41 pm
Hi, can I ask why you changed the units in the linear regression example from the notes please? For instance in the notes the units for January are 100 but you’ve used 1 in the lecture, so my answer for everything x related is out by a factor of 100 but my y answers are right, meaning my final answer is y=32.8+0.068x. Just not sure if I’m doing something wrong? Thank you!
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