[R] Help with R coding

[Jeff Newmiller]

Generally more efficient to filter before grouping.

Note that summarize clears out whatever isn't mentioned in it, so the subsetting currently being done in the mean call could also be done in the pre-filter step and you can avoid filtering other columns and then discarding them by limiting the operations to only those columns that will be referenced:

tmp1 <- tmp %>%
   select( HCPCSCode, Avg_AllowByLimit, AllowByLimitFlag )
   filter( AllowByLimitFlag & Avg_AllowByLimit != 0 ) %>%
   group_by( HCPCSCode ) %>%
   summarise( Avg_AllowByLimit = mean( Avg_AllowByLimit ) )


On May 22, 2019 6:45:39 AM PDT, Rui Barradas <ruipbarradas using sapo.pt> wrote:
>Hello,
>
>Maybe filter the AllowByLimitFlag values first (not tested)?
>
>
>tmp1 <- tmp %>%
>   group_by(HCPCSCode) %>%
>   filter(AllowByLimitFlag) %>%
>   summarise(Avg_AllowByLimit = 
>mean(Avg_AllowByLimit[which(Avg_AllowByLimit!=0)]))
>
>
>Hope this helps,
>
>Rui Barradas
>
>
>Às 13:35 de 22/05/19, Bill Poling escreveu:
>> tmp1 <- tmp %>%
>> group_by(HCPCSCode) %>%
>> summarise(Avg_AllowByLimit =
>mean(Avg_AllowByLimit[which(Avg_AllowByLimit!=0)]))
>> 
>> # But I need Something like that + This
>> 
>> WHERE AllowByLimitFlag == TRUE
>
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-- 
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