Dion Kucera

5 Questions 3 Answers 0 Followers

Questions related from Dion Kucera

How to calculate F(x) for the SPEI drought index?

The Standardized Precipitation Drought Evapotranspiration Index (SPEI) requires a Di term of the difference between precipitation and potential evapotranspiration (PET) on a weekly or monthly...

08 October 2017 5,032 4 View

How to detrend a multidimensional array with missing values?

I'm attempting to detrend time-series data in Matlab 2016b. My data is in a multidimensional array; each "layer" of the array represents one day of measurements. The size of the area, at 2,500 by...

14 July 2017 2,904 3 View

Is it inaccurate to simplify an ARx model to a multiple linear regression?

I'm attempting to calculate the coefficients of the ARx vegetation stability model as described in Keersmaecker et al's 2016 paper, which I've attached. The terms in this model are: NDVI at time...

19 May 2017 1,262 1 View

Is it possible to use the Standardized Precipitation Evapotranspiration Index (SPEI) R package with matrices?

I would like to calculate SPEI using the R package developed by the authors. There seems to me to be two major reasons why I can't use the R package (I'm currently trying to figure out SPEI in...

11 May 2017 10,212 2 View

Clarification for how to aggregate data for Standardized Precipitation Evapotranspiration Index (SPEI)

I currently have monthly precipitation and potential evapotranspiration for each month in my 17-year study. I calculated the water balance for each month by subtracting PET from precipitation. I...

11 May 2017 8,764 2 View