Excel Data Cleansing

Cedric Charlier continues his series on fixing up an Excel file.  First up is turning results into an enumeration:

We’ve previously decided that a DON’T KNOW, shouldn’t influence our average of the answers. To apply this decision, we just need to filter the table Result and remove all the values equal to 0 (Enum value of DON’T KNOW). Then we calculate the average and subtract 1 to get a value between 0 and 4. Coooool, except that if we’ve no value non equal to 0, it will return -1 … not what we’re expecting. We’ll need to validate that the average is not null before subtracting 1.

The next post involves converting respondent information into a dimension:

In this table, only the results with a QuestionId equal to 111 really interest me for a merge with the existing table Respondent. If you’re familiar with the UI of Power BI Desktop then you’ll probably think to create a new table referencing this one then filter on QuestionId equals 111and finally merge. It’ll work but applying this strategy could result in many “temporary” tables. A lot of these small tables used only for a few steps before merging with other tables tend to be a nightmare for maintenance. You can use the “Advanced formula editor” to not display this kind of temporary tables and embed them in your main table.

Read on for more.

Related Posts

The Importance of Interaction in Power BI

Marc Lelijveld continues a series on storytelling with Power BI: Many times, I see reports with loads of visuals on the pages. This results in both a really poor performance, as well as the end user has no clue what the key message is of this report. You can always ask yourself, is this visual […]

Read More

Running Power BI Desktop as a Different Account

Gilbert Quevauvilliers shows how you can run Power BI Desktop as a different domain account, even when your logged-in account is not on the domain: This is not the greatest error message. Fortunately, I knew that I could connect to the server so the issue was not with connectivity but more around how could I […]

Read More

Categories

February 2017
MTWTFSS
« Jan Mar »
 12345
6789101112
13141516171819
20212223242526
2728