reporting services - Converting string to decimal if string isNumeric in SSRS to calculated weighted average -


i have dataset in ssrs column contains both decimals , string value of 'n/a'. sql casts column string (varchar(10)).
example of dataset:

 board      urgency             ticketcounty    averestime  averesoltime  support    open - priority 2   4               5.766666    n/a  support    priority 1          2               1.833333    0.125925          priority 1          3               2.733333    0.875925          priority 2          1               0.000000    0.294444

in total row need calculate weighted average averesoltime each board. expression created:

=sum(fields!ticketcountbypriority.value * iif(isnumeric(fields!averageresolutiontime_busdays.value)=1, cdec(fields!averageresolutiontime_busdays.value), 0))/sum(iif(isnumeric(fields!averageresolutiontime_busdays.value)=1, fields!ticketcountbypriority.value, 0))

for support board value displayed #error total value nan.

i believe problem string values in averesoltime not being converted when numbers , when value 'n/a' throws error. how convert strings decimals can , set value 0 when value 'n/a'?

i corrected 1 issue if of values numeric, weighted average computed. removed `=1'

 =sum(fields!ticketcountbypriority.value * iif(isnumeric(fields!averageresolutiontime_busdays.value), cdec(fields!averageresolutiontime_busdays.value), 0))/sum(iif(isnumeric(fields!averageresolutiontime_busdays.value), fields!ticketcountbypriority.value, 0))

if value n/a, 0 value not used in calculation , still getting #error in result.

update got weighted average calculate using code:

=iif(isnumeric(fields!averageresolutiontime_busdays.value), sum(fields!ticketcountbypriority.value * cdec(iif(isnumeric(fields!averageresolutiontime_busdays.value), fields!averageresolutiontime_busdays.value, 0)))/sum(iif(isnumeric(fields!averageresolutiontime_busdays.value), fields!ticketcountbypriority.value, 0)), 0)

i had put calculation within if statement. still have take care of case of values 'n/a' , @alan states, there divide 0 error.

the second part of expression says if fields!averageresolutiontime_busdays.value not number, divide zero. might easier if expression working instances numeric , wrap in if numeric test. can't test @ moment . iif(isnumeric(fields!averageresolutiontime_busdays.value), yourworkingexpressionhere, 0). replace final 0 'nothing' (no quotes) if want show blank instead of zero


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