Thanks for your video, it helped me a lot. Unfortunately, I still have a problem computing the SPI values: I set up my data exactly as you did (year, month, prcp), but when running the SPI call it does not return the "Jan", "Feb"...etc. headings. plot.spei also does not seem to exist. Do you have any idea what I am doing wrong? Thanks so much for your help!
Thanks for your video. May I ask one question？ For calculating the SPI, I choose the Gamma distribution which is also default for SPI. And I used the maximum likelihood as the estimated method to calculate the parameters of the fitted Gamma distribution. But all the output are NA. I also change it to plotting position, values still NA. If I choose the default one “un-pmw” as same as the video, I could get right output values. I don’t know why the method maximum likelihood can’t work.
Hello, thnak you for this vidéo and explication may i ask you question about how to organise my data in excel to convert my data from daily to mounthly and thank you wish you good Luck
I think this is not monthly average data, because July 1980 average rainfall is more than 100 mm. how can it possible for monthly average data. it is monthly sum data
[1] "Calculating the Standardized Precipitation Evapotranspiration Index (SPEI) at a time scale of 6. Using kernel type 'rectangular', with 0 shift. Fitting the data to a Gamma distribution. Using the ub-pwm parameter fitting method. Checking for missing values (`NA`): all the data must be complete. Using the whole time series as reference period. Input type is vector. No time information provided, assuming a monthly time series." Sir how can i encounter these problems ?
Hi, Nice video. I have one query related to Rainfall data generally, we add(sum) all the RF monthly data but in this video, you mentioned monthly average value. So could you please clarify what data should we take for SPI Monthly (Sum) or Monthly (Average) RF?
Monthly average as in the average rainfall value for the month. :) A question to you: Do you sum up all the daily RF values of a month for calculating SPI?
How I can export result of SPEI into excel or csv file? I tried but I found error "Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors = stringsAsFactors) : cannot coerce class ‘"spei"’ to a data.frame"
you can easily find how to do it if you google it once. how to export R data into excel. The things i have mwntioned above might have some typo and syntax error
Thanks for the video, it mad the work easier but I encountered this issue, [could not find function "plot.spei"] Is there any solution to it? Thanks in advance
Thanks for your video, it helped me a lot. Unfortunately, I still have a problem computing the SPI values: I set up my data exactly as you did (year, month, prcp), but when running the SPI call it does not return the "Jan", "Feb"...etc. headings. plot.spei also does not seem to exist. Do you have any idea what I am doing wrong? Thanks so much for your help!
How to get the column names as 'Jan' 'feb'? my data is arranged exactly like the shown excel yet it doesn't show the column names
Hi. Could you solve this problem?
Thanks for your video. May I ask one question？ For calculating the SPI, I choose the Gamma distribution which is also default for SPI. And I used the maximum likelihood as the estimated method to calculate the parameters of the fitted Gamma distribution. But all the output are NA. I also change it to plotting position, values still NA. If I choose the default one “un-pmw” as same as the video, I could get right output values. I don’t know why the method maximum likelihood can’t work.
How to configurate colors for plot ? Positive and negative have same colors in R studio plots
thank you, how to change the spei class to dbl? I am looking for a method to add the column to the database in R itself , by mutating
Hello, thnak you for this vidéo and explication may i ask you question about how to organise my data in excel to convert my data from daily to mounthly and thank you wish you good Luck
I think this is not monthly average data, because July 1980 average rainfall is more than 100 mm. how can it possible for monthly average data. it is monthly sum data
yes it should be the sum. i miss pronounced . sorry for the error
Hi I have some missing rainfall value so how can I solve the problem
hello in my data lots of zeros thats why my index values are not correct. what could i do for that?
[1] "Calculating the Standardized Precipitation Evapotranspiration Index (SPEI) at a time scale of 6. Using kernel type 'rectangular', with 0 shift. Fitting the data to a Gamma distribution. Using the ub-pwm parameter fitting method. Checking for missing values (`NA`): all the data must be complete. Using the whole time series as reference period. Input type is vector. No time information provided, assuming a monthly time series."
Sir how can i encounter these problems ?
ME too
Please can you advise me how to solve it?
please how can I modify the horizontal axis value, to use dates instead of numbers?
th-cam.com/video/xYwv6lIdu9E/w-d-xo.html
Hi Could you pls tell us how we can download the SPEI package for Rstudio?
Hi, Nice video. I have one query related to Rainfall data generally, we add(sum) all the RF monthly data but in this video, you mentioned monthly average value.
So could you please clarify what data should we take for SPI Monthly (Sum) or Monthly (Average) RF?
Monthly average as in the average rainfall value for the month. :)
A question to you: Do you sum up all the daily RF values of a month for calculating SPI?
How I can export result of SPEI into excel or csv file? I tried but I found error "Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors = stringsAsFactors) :
cannot coerce class ‘"spei"’ to a data.frame"
store the variable in a data frame first with
df
After that u have to actuvate the writexls package.
and use write_xlsx( df, " file path [ add an extra \ to each \") to export into excel
you can easily find how to do it if you google it once. how to export R data into excel.
The things i have mwntioned above might have some typo and syntax error
Could you please clarify what data should we take for SPI Monthly (Sum) or Monthly (Average) RF ???
same question !!
Hello guys.
Please take the sums
Thanks for the video, it mad the work easier but I encountered this issue, [could not find function "plot.spei"] Is there any solution to it? Thanks in advance
hello did you find a solution for this
Good day I did properly understand how you calculated the SPI
Also how do you account for missing data values
For mIssing data values, i have simply filled in the average values around the study period :D
Ohk thanks for your feedback sir
When plotting spi 3 do we use the 3rd spi value
@@theteddychannel2770 mr ted thanks for the data
Could I please send you my paper for you invaluable inputs about my data
@@Emeritus63s yes sure. please mail them to me manbrawl270@gmail.com
Could you please share the download link
drive.google.com/file/d/1PwpFvsyHcf42x7pdRs54YsvvnQjtGjS_/view