Counting reports of clients on in specific group

[Jannikskak]

Hello everybody.

I am quite new to PBI, and I'm trying to get acquinted with the possibilites in Power Query.

I have a dataset of some hundred thousand rows each representing a report made by contractors of different firms. Some of the firms are grouped. 

I wish to count, in a column, the reports by the name having filled out the report on condition of the report being in specific firm groups (GroupO and report classification "Single"). That is, I am in need of af DAX formula quite like the COUNTIFS of Excel. I have tried composing a collumn of the form: 

Measure =

CALCULATE(COUNT(Sheet1[Contractor]),

FILTER(ALL(Sheet1),Sheet1[c_firma_navn_aggregeret]="GroupO"),

FILTER(ALL(Sheet1),Sheet1[EM_type]="Single"))

This gives me a column of the total of reports satisfying these criteria. The problem is, that i wish to have the total number of reports peformed by each "Contractor[name]", that should give me "0" for contractors not in GroupO.

Does any of you sharp minds know my best of solving this?

Thank you very much in advance! 

[Manoj_Nair]

@Jannikskak - try this DAX and let me know if this fixes your problem. Many Thanks

Measure = if(Sheet1[c_firma_navn_aggregeret]="GroupO", 
CALCULATE(COUNT(Sheet1[Contractor]),
FILTER(ALL(Sheet1),Sheet1[c_firma_navn_aggregeret]="GroupO"),
FILTER(ALL(Sheet1),Sheet1[EM_type]="Single")),0)