Average between two columns not correct

[jhlatinia]

Hello,

I've been trying to calculate the average of the division of 2 columns in PowerBi Desktop and not receive the right results.

As you can see the column CTR is returning 0,66% for the first line, when it should be: 0.58%

And it return 0,80 for the second, when it should be 0,83.

My Column CTR is :

CTR = DIVIDE(LinkedInAds[Clicks],LinkedInAds[Impressions],0)

Thank you for your help.

[v-jianboli-msft · Accepted solution]

Hi @jhlatinia ,

The result you get is incorrect is because it is the sum of all rows. In other words, they calculate the percentage of each row first and then sum it, which gives a different result than summing and then calculating the percentage.

Please try:

CTR = 
VAR _a =
    SUMMARIZE (
        'Table',
        'Table'[Campaign Group Name],
        "CTR",
            DIVIDE (
                CALCULATE (
                    SUM ( 'Table'[Clicks] ),
                    FILTER (
                        'Table',
                        [Campaign Group Name] = EARLIER ( 'Table'[Campaign Group Name] )
                    )
                ),
                CALCULATE (
                    SUM ( 'Table'[Impressions] ),
                    FILTER (
                        'Table',
                        [Campaign Group Name] = EARLIER ( 'Table'[Campaign Group Name] )
                    )
                )
            )
    )
RETURN
    AVERAGEX ( _a, [CTR] )

Final output:

Best Regards,

Jianbo Li

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[v-jianboli-msft]

Hi @jhlatinia ,

What does your Start Date look like? What is the relationship between the date and the value?

Sorry for that the information you have provided is not making the problem clear to me. Can you please share more details to help us clarify your scenario?

Please provide me with more details about your table and your problem or share me with your pbix file after removing sensitive data.

Refer to:

How to provide sample data in the Power BI Forum

How to Get Your Question Answered Quickly

Best Regards,

Jianbo Li

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[jhlatinia]

Hi,

This is the format.

[v-jianboli-msft]

Hi @jhlatinia ,

Are you trying to calculate the average of the CTR?

Here is my sample:

Please try:

Measure =
VAR _a =
    SUMMARIZE (
        'LinkedInAds',
        LinkedInAds[Group Name],
        "CTR",
            DIVIDE (
                CALCULATE (
                    SUM ( LinkedInAds[Clicks] ),
                    FILTER ( 'LinkedInAds', [Group Name] = EARLIER ( LinkedInAds[Group Name] ) )
                ),
                CALCULATE (
                    SUM ( LinkedInAds[Impressions] ),
                    FILTER ( 'LinkedInAds', [Group Name] = EARLIER ( LinkedInAds[Group Name] ) )
                )
            )
    )
RETURN
    AVERAGEX ( _a, [CTR] )

Final output:

Best Regards,

Jianbo Li

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[jhlatinia]

The measure look right, may I had, that Impressions or clicks are the sum of each lines of the last 7 days.

Meaning, I filtered by Start Date which doesn't show in the image, does it change the measure?

Sorry I'm quite new to all of this! And thank you for your help, really appriciated :).

[Greg_Deckler]

@jhlatinia Are Impressions and Clicks measures? If so, what are the formulas?

[jhlatinia]

@Greg_Deckler, no they are normal number column data.