 
Test for stationarity (pp-test). In R source code all other command executions I understood, but how I am getting the ssqrtl value 

ssqrtl <- .C ("R_pp_sum", as.vector(u,mode="double"), as.integer(n),
                  as.integer(l), trm=as.double(ssqru), PACKAGE="ts")

please explain the above command.

Thanks in advance
Ramesh
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