New distinct ID count over several years/months/days

[vrnvlk]

Hi everyone! 

I'm facing an issue with a chart that I would need help with. 

I have a bar chart where the time dimension can be changed to year/half year/quarter/month/week/day etc. by a variable. The measure shows the distinct count of IDs which have a demand per selected time dimension. The formular is count({<demand={1}>} distinct FAHRGESTELLNR_17)

What I would like to have is a stacked bar chart where I can see how many distinct IDs are new each year/month/day ... (depending on the selected time dimension). For example if I have 'month' as time dimension the bar chart should look something like this:

so the red stack should display, how many new distinct IDs came up that month and the blue one how many appeard already in previous months. 

I'm not sure how to do that, especially with the dynamic time dimension 

Any help is much appreciated!

[SterreKapteijns]

I would assume you would need to have 2 measures in the chart, one measure for the 'old' ID's and one measure for the 'new' ID's. Do you have a datefield from which you can determine whether the ID is new? If so, you would need to include a set expression in the measure that compares the value..

But I'm a bit unsure about the context, could you explain more about the intention of the chart? You say you need to visualize the ID's that have demand in a certain timeframe, and you need to display the new ID's.