[R-sig-Geo] Trend significance bfast

[Bacou, Melanie]

Sorry, sent that too fast. `seasonal()` is defined in the bfast package 
here:
https://github.com/cran/bfast/blob/master/R/seasonal.R

--Mel.


On 7/8/2016 1:51 AM, Bacou, Melanie wrote:
> Guillaume,
> See https://www.rforge.net/doc/packages/hydroTSM/seasonalfunction.html 
> for the `zoo:seasonal()` function. In general just look into the 
> package's NAMESPACE to see which libraries are imported.
>
> --Mel.
>
>
> On 7/7/2016 5:10 PM, Guillaume Clair wrote:
>> Hi,
>>
>> I'm using the function (and package) bfast to work on some NDVI MODIS 
>> datas
>> in Kenya.
>>
>> I modified the original function in order to extract directly the only
>> datas that I need, i.e. the trend component (Tt) and the dates of
>> breakpoints in trend (bp.Vt)
>>
>> I'd like to process the results in order to get the slopes (this I 
>> managed
>> since it is easy math), and also very importantly I would like to get 
>> some
>> significance of the trend, like it is generally possible to get with the
>> parameter ANOVA = T in the plot.bfast function. We can see an exemple of
>> the result HERE <http://fr.tinypic.com/r/doo3l0/9>.
>>
>> I have two separate questions, the first one is critical, the second is
>> more out of curiosity in order to understand something that I don't
>> understand for now :
>>
>> - in the source code of the function plot.bfast (
>> https://github.com/cran/bfast/blob/d8d853096d628b62251c6d302319fa95c14e0206/R/plot.bfast.R), 
>>
>> the lines 36 and 37 are processing the ANOVA parameter. Could someone
>> explain me what is the seasonal() function which is used, and which I
>> cannot find anywhere ? What I would like to do is to adapt/create my own
>> script in order to get the same information directly from my own 
>> processed
>> datas (only Tt and bp.Vt), since I cannot process it again by lack of
>> computing power. I hope the absence of the ci.Vt won't be a problem...
>>
>> - does someone know why sometime the ANOVA parameter doesn't work ? And
>> instead return an error
>>
>> Error in out$bp.Wt$datatsp : $ operator is invalid for atomic vectors
>>
>> with a plotting just partially made...
>>
>> Thank you all for your attention.
>>
>> Best regards.
>>
>> Guillaume
>>
>> R Version : 3.3.1
>>
>> Platform : x86_64-w64-mingw32
>>
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>>
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>