Spotfire create growth calculated column -


i totally new @ spotfire environtment. want create new calculated column growth of other column. here data :

item  ||  date       || value  || growth     ||  12/12/2014 || 102    ||      ||  13/12/2014 || 121    || 19 b     ||  12/12/2014 || 141    ||  b     ||  13/12/2014 || 111    || -30

how create growth column custom expression?

i sample code solve similar problem. but, still got error.

first of create hierarchy named hirarki include item , date. create custom expression, there's error said "couldnt find hierachy : 'hirarki'"

sum([value]) on (intersect(parent([axis.hirarki]),[axis.hirarki])) - sum([value]) on (intersect(parent([axis.hirarki]),previous([axis.hirarki])))

why spotfire couldnt find hierarchy?

thank you, cheers

i think formula calculates need

sum([value]) on ([item],[date]) - sum([value]) on (intersect([item],previous([date])))

-

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