ssas - How to calculate average based on distinct counts in MDX -

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my ssas cube has following fact , dimensions columns shown below

factactivity

datekey, userkey, activitykey, activitycount

dimdate

datekey, date, week, year

dimuser

userkey, username, gender

dimactivity

activitykey, activityname

i have created distinct count measures of users , dates follows

[distinct users]

count(nonempty([dimuser].[userkey].[userkey].members, [measures].[activitycount])

[distinct dates]

count(nonempty([dimdate].[datekey].[datekey].members, [measures].[activitycount])

both these measures working correctly expected when slice/pivot activityname.

now wanted calculate average days per user, created metric follows

[avg days per user]

avg([dimuser].[userkey].[userkey].members, [measures].[distinct dates])

but giving me wrong results.! tried

divide([measures].[distinct days], [measures].[distinct users])

still wrong results...what i'm doing wrong?

maybe adding in existing help?

avg(   existing [dimuser].[userkey].[userkey].members,    [measures].[distinct dates] )

although trying recreate similar in advwks seem top valid return without existing:

with    member [measures].[avg count per reseller]      avg     ( [reseller].[reseller].[reseller].members      ,[measures].[reseller order count]     ), format_string = "0.0000"  select    {[measures].[reseller order count],[measures].[avg count per reseller]} on 0  ,{[promotion].[promotion].[all promotions].children} on 1 [adventure works] [date].[calendar year].&[2005];

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