Exercise: Use parameters to show only certain crime statistics

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The answer to the exercise will be included and explained if you attend the Wise Owl course listed below!

Category ==> Power BI Desktop  (26 exercises)
Topic ==> Parameters  (2 exercises)
Level ==> Average difficulty
Course ==> Power BI Desktop
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Create a new Power BI Desktop file, and load the Excel workbook from the folder above.  Use this to create a table showing the number of offences for each offence subgroup (you can see a link to the original data source here, if you're interested):

Offences table

The first few roles of the table.

 

We want to be able to filter this to show only those offences for a particular group:

List of offence groups

The offence groups. It would be nice to be able to type one of these into a parameter box, and see the table change!

 

In Query Editor, create a new parameter called OffenceGroup, and set its default value to Robbery (if for no other reason than that it's the shortest to type in!):

Your new parameter

Your parameter should look something like this.

Still in Query Editor, filter the table of offences to show only those ones for the offence group specified by your parameter:

The final table

After returning to your report, you should now see your table is much smaller!

 

We could do with a title for our report.  Go back to Query Editor, and tell Power BI Desktop that you want to load your parameter into your data model:

Loading parameter

In Query Editor, choose to enable loading for your parameter.

 

Now add a measure to the main data table, with a formula looking something like this:

Title = "Showing offences for group - " &
UPPER(values(OffenceGroup[OffenceGroup]))

Display this measure in a card to get a nice-looking report:

Parameter in title

You'll need to turn the card's Category Labels off to get this effect.

 

Go into Query Editor and change the offence group to Drug offences, and check that your table then updates:

Drug offences table

To avoid getting an error, you'll need to refresh your report to bring in the changed value of the parameter (the table will do this, but the card won't).

 

Save this as Was it worth it, then close down the Power BI instance you're using. 

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