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Frequent Visitor

Calculate Number of Periods of Consecutive Increase/Decrease

I have data that looks like the first three columns here:

I am wanting to calculate the fourth column, in italics. This number represents the number of consecutive months that the score has increased or decreased leading up to that point: for example, in September, Site A's score had decreased for three months in a row (80% -> 20% -> 10% -> 0%), so its sustaining change was -3. In February, meanwhile, its score had increased for just one month (60% -> 70%) so its sustaining change was +1.

I have spent quite some time playing around with DAX functions and table variables trying to find a solution to do this but am finding it a bit too complicated - any suggestions?

(If relevant, I do have a Date table linked to my table via a "First Day of Month" column)

1 ACCEPTED SOLUTION

Accepted Solutions
Super User

Re: Calculate Number of Periods of Consecutive Increase/Decrease

Can we do it in 2 steps

First this supporting calculated column

```EachMonthChange =VAR Mymonth = [Month]RETURNIF ([Score]> CALCULATE (MIN ( Table1[Score] ),FILTER ( Table1, Table1[Month] = Mymonth - 1 && [Site] = EARLIER ( [Site] ) )),1,-1)
```

Then the desired one

```Sustaining Change =
VAR mychange = [EachMonthChange]
VAR result =
MINX (
TOPN (
1,
FILTER (
Table1,
[Month] < EARLIER ( [Month] )
&& [EachMonthChange] <> mychange
&& [Site] = EARLIER ( [Site] )
),
[Month], DESC
),
[Month]
)
RETURN
( [Month] - IF ( ISBLANK ( result ), 1, result ) ) * [EachMonthChange]
```

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3 REPLIES 3
Super User

Re: Calculate Number of Periods of Consecutive Increase/Decrease

Can we do it in 2 steps

First this supporting calculated column

```EachMonthChange =VAR Mymonth = [Month]RETURNIF ([Score]> CALCULATE (MIN ( Table1[Score] ),FILTER ( Table1, Table1[Month] = Mymonth - 1 && [Site] = EARLIER ( [Site] ) )),1,-1)
```

Then the desired one

```Sustaining Change =
VAR mychange = [EachMonthChange]
VAR result =
MINX (
TOPN (
1,
FILTER (
Table1,
[Month] < EARLIER ( [Month] )
&& [EachMonthChange] <> mychange
&& [Site] = EARLIER ( [Site] )
),
[Month], DESC
),
[Month]
)
RETURN
( [Month] - IF ( ISBLANK ( result ), 1, result ) ) * [EachMonthChange]
```

Try my new Power BI game Cross the River
Super User

Re: Calculate Number of Periods of Consecutive Increase/Decrease

Attaching the pbix file as well with your sample data

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Highlighted
Frequent Visitor

Re: Calculate Number of Periods of Consecutive Increase/Decrease

Hi,

I am really interested in this for an SPC chart when looking to plot runs of increases/decreases. However, I currently have more than just "Site" to filter to. I would also like to be able to slice on the following fields: Site, Specialty, POD.

Because my visuals and the SPC chart are driven by those slicers, is it possible to come up with a calculated measure for this?

For example, chart for Site A, all Specs, all POD's may show sequences of increases/decreases but slicing the the Spec to 130 and POD to 1st Attendance would need to re-calculate the sequences.

Also, I am not working with month numbers but MonthDateStart (01/01/2000, 01/02/2000 etc)

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