Measure for Minimum n/sample size

[Anonymous]

Hi all, I have a tricky issue: how best to suppress low sample sizes which can be inferred from the present of other data? For example, when a male N is 2, and the total of staff is 9, then even when the male count of 2 is suppressed (disincluded), if the female count of 7 is provided then the male count can be readily inferred. (And this is an even simpler example as it's a binary category (for us) as opposed to multiple categories for things such as race/ethnicity and management band.

In order to preserve personal identity markers, I want to suppress any count <5. Looking at these two forum posts (https://community.powerbi.com/t5/Desktop/Exclude-cells-with-small-sample-sizes/m-p/176805 & https://community.powerbi.com/t5/Desktop/applying-filters-with-minimum-sample-size/m-p/659289) I am using the following DAX, which works well when substitute in the value portion of the visualization:

Suppress_Low_Sample = IF(COUNTAX(WORKER_AVG_HC,WORKER_AVG_HC[EEID])<=4, "***", COUNTAX(WORKER_AVG_HC,WORKER_AVG_HC[EEID]))

Voila, I got from this 

 to this

 

Now, my next issue should be apparent. With just a little bit of mental math, one is able to determine the suppessed sample size of 3 is actually 3 -- by subtracting 5 from 8. I've been toying around with various DAX but haven't landed on a workable solution.

I found a potential visual filter solution (https://community.powerbi.com/t5/Desktop/applying-filters-with-minimum-sample-size/m-p/659289), but it's not quite working for me:

MeasureforVisualFilter =
IF (
    CALCULATE ( COUNTROWS ( tableName ), ALLEXCEPT ( tableName, TableName[City] ) ) < 5,
    1
)

 I'd appreciate any thoughts or ideas to make this work, both for binary instances and cases where there are multiple categories to take into account.

[v-frfei-msft · Accepted solution]

Hi @Anonymous ,

Does that meet your requirement?

Measure = 
VAR a =
    MINX (
        ALL ( WORKER_AVG_HC[EEID] ),
        CALCULATE ( COUNTX ( WORKER_AVG_HC, WORKER_AVG_HC[EEID] ) )
    )
VAR b =
    COUNTX ( WORKER_AVG_HC, WORKER_AVG_HC[EEID] )
RETURN
    IF ( a = b, "***", b )

Pbix as attached. If it doesn't meet your requirement,  kindly share your sample data and excepted result to me if you don't have any Confidential Information. Please upload your files to One Drive and share the link here.