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# Need Help With Calculating Percentile Ranks (using RANKX, MAX, etc.)

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12-11-2018 01:04 PM

Hi all,

I am reposting this since I hadn't attached a dataset last time and once I did it was too late as nobody was veiwing it anymore. So here I am still running into the same issue... below is the scenario/my thought process:

I have a data set with the following raw data: Country Name, Government Debt to GDP ratio, Gross National Income (GNI), Year. However keep in mind that some countries do not have data for certain years.

I use GNI in a **measure [development category]** to categorize countries as either Advanced, Developing, or Emerging based on their GNI value for a given year. (again some countries don't have data and thus don't have a category for certain years).

Now, the ultimate goal is to calculate how Debt to GDP for a country compares to that of its peers in its development category during any given year, using percentile ranking. So for example, in 2011 where did Chile's Debt to GDP fall in comparision to other countries in its [development category] for that year? Ideally this would be another measure/column I could add to the table (shown in the sample file below).

My understanding is that to get a percentile ranking of something you need the (total # of ranks – rank)/total # of ranks.

So in my scenario I would need to first rank each country by its Debt to GDP ratio. I have created a **RANKX** measure that does this called **[Gov Debt to GDP Rank]**. This measure also makes sure not to include blanks in the ranking.

Next we would need to find the MAX of this measure (or some other proxy for total # of data points) which is where I start running into some problems. I am not sure how to approach this in a way that Power BI will calculate the max # of data points given all these variables (country/indicator/year). At first I thought maybe I could just use the total # of countries but that doesn't work since some years there are countries that don't have data and thus aren't included in the ranking. Using the MAX or MAXX functions on the **[Gov Debt to GDP Rank] **measure doesn't seem to work as MAX is only compatible with a column or multiple values and not a measure...

Here is link to a sample PBIX file with the problem laid out, it is hosted on FileDropper.com: http://www.filedropper.com/simplifiedhelpfile_1

Any help you guys could provide would be much appreciated. Let me know if you need any more info.

Thank you.

## Re: Need Help With Calculating Percentile Ranks (using RANKX, MAX, etc.)

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12-12-2018 01:28 AM

You may add measure below.

Measure = MAXX ( ALLSELECTED ( Countries[Country] ), [Government Debt to GDP Rank] )

If this post

**helps**, then please consider

**to help the other members find it more quickly.**

*Accept it as the solution*## Re: Need Help With Calculating Percentile Ranks (using RANKX, MAX, etc.)

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12-13-2018 10:30 AM

@v-chuncz-msft wrote:

You may add measure below.

Measure = MAXX ( ALLSELECTED ( Countries[Country] ), [Government Debt to GDP Rank] )

Hi Sam,

That measure works to get me the max value and I further use that to create the percentile ranks. However, I still need to be able to either filter the results by the development category or modify the measure you have made to find the max rank for each category sperately so that the resulting percentile ranks are according to category. Since development category is a measure, I cannot use it in a slicer. How can I do this?

Thanks,

Raj