3 Replies Latest reply: Dec 4, 2013 1:41 AM by Nitin Gupta

# How to chart 2 independent measures on a common dimension?

I have a problem charting 2 measures on a common dimension. I have work tickets that are created by customers and then worked on, and closed some time (days) later.

I need a chart that show both of these volumes on a common month dimension. Since I cannot select Create Date nor Closed date, as this would show incorrect data, I created an independent calendar and use an if statement to count the Created and the Closed tickets. So I select a period ( in the below example Month) on the independent calendar to get the chart results.

example of the if statement for Created Tickets:

count(distinct if([TicketCreateDate]= CalendarDate,[Ticket Number]))

and for Closed Tickets

count(distinct if([TicketCloseDate]= CalendarDate,[Ticket Number]))

example of chart

Now this works perfectly fine. The problem is that when I have a large set of data 5 to 10 million records it is incredible slow. The reason is that it compares every record against every Selected Calendar date for closed AND open.

So my question is how can I accomplish the same thing but with a faster response time? I did try set analysis but it did not seem to be faster, but perhaps I implemented it incorrectly.

I suspect there is a good solution to this.

Jim

• ###### Re: How to chart 2 independent measures on a common dimension?

Either modify an existing table or create a new table with something like this:

TicketDates:

Load distinct [Ticket Number], TicketCreateDate as CalendarDate, 0 as OpenClose

from ...tickettable... ;

Load distinct [Ticket Number], TicketCloseDate as CalendarDate, 1 as OpenClose

from ...tickettable... ;

You can then use the new OpenClose field in the expressions:

Opened SRs: count({<OpenClose={0}>} [Ticket Number])

Closed SRs:  count({<OpenClose={1}>} [Ticket Number])

0 and 1 are just examples. Strings like 'Open' and 'Close' work too, but perhaps a little slower.

• ###### Re: How to chart 2 independent measures on a common dimension?

Thank you Gysbert. This answer is correct. However I have a follow on question. For counts this works fine and it speed it up a great deal. But I neglected to say that I also want averages of certain fields. Averages work with this also provided that Incidents Numbers only have one line each.  But  I have duplicate  Incidents Numbers  and this is ok for counts as I can count distinct.

But if I want to average a field I need to average it against each unique Incident number. I can't seem to get the logic for averaging (using aggr) against a unique field entry.

for instance if I have

Incident Number        Field X

12345                        5

12345                        5

54321                        3

So the average of these 2 incidents is 5+3 / 2 = 4         NOT    5+5+3 /3 = 4.3

Any ideas on that would be appreciated.

Basically I want to

average (Field X)

but only selecting distinct Incident Numbers

• ###### Re: How to chart 2 independent measures on a common dimension?

Hi Jim,

You can also use avg(distinct Field X) as one of your measure.

Regards

Nitin Guta