Hi, I have a dataset with three columns: stations, Year, and avg.
There are 19 stations, and five to six years per Year, and a value for each year.
I am trying to run the Mann Kendall trend test on each of the 19 stations, using the rkt function.
I starting writing the code, copying, then changing the name of the station 19 times. I am sure there is a more efficient way to do this with loop, or lappy? Could someone help me on this? I am still learning this R!
My code: ("Year" has to be numeric for this to run)
library(rkt) ###### tn_trend1 <-rkt(date=alachua.tn.wide$Year, y=alachua.tn.wide$BLUCOPK) #> Error in integer(n): object 'alachua.tn.wide' not found tn_trend1 #> Error in eval(expr, envir, enclos): object 'tn_trend1' not found
Created on 2021-05-03 by the reprex package (v1.0.0)
My data:--just the first two stations, of five years
A tibble: 105 x 3
station Year avg
1 ALACHCHAN 2014 0.925
2 ALACHCHAN 2015 1.97
3 ALACHCHAN 2016 1.5
4 ALACHCHAN 2017 2.3
5 ALACHCHAN 2018 1.15
6 BLUCOPK 2014 1.5
7 BLUCOPK 2015 1.5
8 BLUCOPK 2016 1.7
9 BLUCOPK 2017 1.95
10 BLUCOPK 2018 1.33