topic Re: Count Rows Based On Previous Row's value. in DAX Commands and Tips

Count Rows Based On Previous Row's value.

MrFahrenheit — Tue, 16 Aug 2022 18:20:43 GMT

I have one column and it has 0s and 1s in it. I ONLY want to count the 0s which are followed by a 1 in the next row. For example, 0,1,0,1,0,1 would count 3 x 0s. Another example, 0,0,0,0,1 would only count one 0 because only one 0 is followed by a 1.

= 1 x 0 (only one 0 is followed by a 1

= 2 x 0

If anyone knows how to do this, please let me know. I checked into all the "Count" expressions but couldn't figure it out.

Re: Count Rows Based On Previous Row's value.

Fowmy — Tue, 16 Aug 2022 18:54:42 GMT

MrFahrenheit

First, add an index column to your table in Power Query:

Then create the following measure to calculate the count:

Zero Count = SUMX( Table4, VAR __CURRENTINDEX = Table4[Index] VAR __NEXTINDEX = __CURRENTINDEX + 1 VAR __CURRENTDIGIT = Table4[Digit] VAR __NEXTDIGIST = CALCULATE( MAX(Table4[Digit]) , Table4[Index] = __NEXTINDEX , REMOVEFILTERS(Table4)) RETURN INT(__CURRENTDIGIT=0 && __NEXTDIGIST = 1) )

Re: Count Rows Based On Previous Row's value.

MrFahrenheit — Wed, 17 Aug 2022 12:59:08 GMT

Thank you for your solution! I tested your suggestion by creating a smaller spreadsheet with only 50 items and manually counted how many "zeros" were followed in the next row by numbers greater than "zero". When I applied your measure/index idea, it came out to the right number!! I modified your code slightly to use "> 0" instead of "+ 1" in this part of the code (see example below) to count all "zeros" followed by any number greater than "zero":

INT(__CURRENTDIGIT=0 && __NEXTDIGIST = 1)