Scatter Chart Bubble Size

[FlowViz]

Hi Guys,

I have a table like so:

WorkItemID	CycleTimeDays	DaysSinceCompleted
34	2	-1
35	2	-1
36	6	-1.25
37	7	-2

Which is visualised in a scatter chart (CycleTimeDays - Y-Axis / DaysSinceCompleted - X-Axis).

Unfortunately the bubbles overlap for certain ID's (see WorkItemID 34 and 35). 

Is there a way to create a measure for the bubble size? I'd like to highlight overlapping items with a larger bubble...

[FlowViz]

I think the larger bubble solution works better. DaysSinceCompleted is calculated using NOW()-Closed Date. So over time this will increase and using jitter could skew how many days since it was actually completed.

With the larger bubble, is it possible to do a custom tooltip that would show the data for each item on hover?

[v-shex-msft]

HI @FlowViz,

Perhaps you can take a look at the following link to know more about creating a custom report tooltip page if it is suitable for your requirement.

Create tooltips based on report pages in Power BI Desktop 
Regards,

Xiaoxin Sheng

[negi007]

@FlowViz You could create your visual like below

I have create a measure also like below which i have used in tooltip

Items = if ( COUNT(WorkItemID[ CycleTimeDays]) >1, "Multiple Items", "Single Item")

 

let me know if it works for you or not. thanks

[PhilipTreacy]

Hi @FlowViz 

Yes, using jitter for overlapping ponts will avoid the need for larger bubbles.

I'm not sure what your subsequent comment means : over time (as DaysSinceCompleted increases) the jitter won't work as the new measure will give a range of results since it was completed ?

If you aren't going to or can't use jitter, will you just use the larger bubble solution?

Regards

Phil

[PhilipTreacy · Accepted solution]

Hi @FlowViz 

Download PBIX with these examples

Yes you can use this measure for bubble size

Bubble Size = CALCULATE(COUNTROWS('Table'), FILTER(ALL('Table'), 'Table'[CycleTimedays] = SELECTEDVALUE('Table'[CycleTimedays]) && 'Table'[DaysSinceCompleted] = SELECTEDVALUE('Table'[DaysSinceCompleted])))

To give this

You might also consider introducing jitter to one of the axes to shift overlapping points slightly.

This measure shifts the x value slightly for points that overlap.  It uses the [Bubble Size] measure from above.

Jittered X = IF([Bubble Size] > 1, SELECTEDVALUE('Table'[DaysSinceCompleted])*(RAND()), SELECTEDVALUE('Table'[DaysSinceCompleted]))

Giving this visual.  The amount of jitter/shift for each point can be tweaked so it's not shifted too much.

Further info on jitter Jitter in Excel Scatter Charts • My Online Training Hub

Regards

Phil

[jackmeull]

@PhilipTreacy I know this is an old thread, but I have a similar issue and would like to make a bubble size measure just like this except with field parameters allowing the user to select x and y axis variables. My code is:

Bubble Size = CALCULATE(COUNTROWS('A1'), FILTER(ALL('A1'), 'X Question'[X Question Fields] = SELECTEDVALUE('X Question'[X Question Fields]) && 'Y Question'[Y Question Fields] = SELECTEDVALUE('Y Question'[Y Question Fields])))

and I get an error saying a single value cannot be determined. How can I refer to my parameters in terms of table A1?

Thanks!

[Anonymous]

@PhilipTreacy Thanks for a great solution, I had the same issue. 

However, my x & y values only range between 1-5, is it possible to use a lower value for the shift? As far as I know RANDBETWEEN doesn't allow for decimals? Any other ideas?

I want as small shift as possible, but still enough so it's noticable

[FlowViz]

Thanks Phil - could I use jittering to avoid having the need for a larger bubble size? If so how would I do that?

[FlowViz]

Ah I actually realised that over time (as DaysSinceCompleted increases) the jitter won't work as the new measure will give a range of results since it was completed 😞