[GRASS-user] Calculate p value for regression slope in r.series

[Paulo van Breugel]

Good suggestion, and coincidentally I was just looking at it. Am I correct
to assume that to mimic the calculation of slope etc in r.series, I would
need to create a second time series of 'dummy' maps with values 0 for first
time period, 1 for second time period, etc.? I did this in R and it gave
the same slope and offset as r.series.

Just wondering, if it is implemented in r.regression.series, would it be
very difficult to port to r.series? Or do the two things function different
internally?

Cheers,

Paulo



On Thu, Nov 8, 2012 at 10:55 AM, Moritz Lennert <
mlennert at club.worldonline.be> wrote:

> On 06/11/12 09:55, Paulo van Breugel wrote:
>
>> Hi,
>>
>> I am using r.series to calculate linear regression slope, offset and
>> coefficient of determination. But any idea how I can get the standard
>> deviation t-value and p-value of the slope?
>>
>
> Try MarkusN's r.regression.series in the addons for grass7. It allows the
> calculation of t and f values. IIRC, p-value can be calculated from t-value.
>
> Moritz
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20121108/5c392701/attachment.html>