Testing for a non-zero linear trend.

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Zach
Zach 2013-7-16
I am working with some station climate data. I am taking the pair-wise differences between neighboring stations' temperature values and plotting those differences in a time series. If I want to find out whether or not there is a significant non-zero trend in these data, would I use the regress(y,X) function? Here's an example of what I'm doing:
>> X=[x ones(92,1)];
>> y=0.00089303*x-2.1248;
>> [b,bint,r,rint,stats]=regress(y,X);
>> stats
The stats should return the F-statistic and its corresponding p-value which is testing for a non-zero slope, correct?
Thanks
ZH

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回答（1 个）

Jason
Jason 2013-7-16
Yes that is correct as long as the constant vector is included. Else the F is not valid.
You can also use regstats for other models and more stats than are available in regress (leverages etc).
cheers.

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