如何使用Power BI中的当前数据集计算3个月的滚动平均值？

Question

I'm new to power BI and i require your assistance. I want to create a visualisation showing the average number of tickets from the previous 3 months and compare it with the current month. Is there any easy way to do this? I have tried many solutions online but it dosen't work. I think it is because my dataset may not suit the solution.

My data:
Tickets | Date
1 | 6/30/2019
1 | 6/10/2019
1 | 7/1/2019
0 | 7/2/2019
1 | 6/30/2019

There are many more columns and rows. The value of ticket is either 1 or 0 and the date can be repeated. This is the data i received from an API.

This is what i currently have
The data would get bigger and bigger as time goes by. I would want to add a 3month rolling average line in this current visualization that i have.

Thank you!

Answer 1

Here we go:

First I created a column FirstDayMonth,this I use to group all data of the same month

FirstDayMonth = EOMONTH(Tickets[Date];-1)+1

My table looks like:

Next I create a summarized table grouped by the FirstDayMonth

TicketsMonth = SUMMARIZE(Tickets;Tickets[FirstDayMonth];"Amount"; SUM(Tickets[Tickets]))

I add a column Ave3PrevMonth

Ave3PrevMonth = 
    var totalMonths = YEAR(TicketsMonth[FirstDayMonth]) * 12 + MONTH(TicketsMonth[FirstDayMonth]) - 3
    var periodStart = DATE(totalMonths/12;MOD(totalMonths;12);1)
    var periodEnd = TicketsMonth[FirstDayMonth]
return 
    CALCULATE(SUM(TicketsMonth[Amount]);
        FILTER(TicketsMonth; TicketsMonth[FirstDayMonth] >= periodStart && TicketsMonth[FirstDayMonth] < periodEnd))/3

This is the tricky bit as Power bi is not strong with dates..

I added an extra column PeriodStart to show the date from where average is taken:

PeriodStart = 
    var totalMonths = YEAR(TicketsMonth[FirstDayMonth]) * 12 + MONTH(TicketsMonth[FirstDayMonth]) - 3
return DATE(totalMonths/12;MOD(totalMonths;12);1)

End result: