ssas - MDX calculated member for average sales for top 10 persons -

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supposing have electronics store 10 types of articles , 50 sales persons. can average number of sold articles 10 persons more sales each type of article?

i started creating named sets top 10 persons each article:

create dynamic set currentcube.[top 10 persons - laptops]  topcount([dim person].[person name].members, 10, ([measures].[sales], [dim article].[article name].&[laptop]));  create dynamic set currentcube.[top 10 persons - tvs]  topcount([dim person].[person name].members, 10, ([measures].[sales], [dim article].[article name].&[tv]));

i other eight.

then trying create calculated member each article type. each calculated member sum total sales particular article top 10 persons included in corresponding named set, , divide 10.

how can this? or, recommend different approach?

i able find solution this. not necessary create named set. ended doing:

avg(topcount([dim person].[person name].children, 10, ([measures].[sales], [dim article].[article name].&[laptop])), ([measures].[sales], [dim article].[article name].&[laptop]))

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