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ENH Improve visualization of time-series data in Cognos 10
Properties of Cognos are very limited when it comes to visualization of time-series data. Cognos allows only fixed intervals between measurements instead of having actual true time intervals. Due to this limitation an exponential increase of followed critical measurements is hidden and thus it might be overlooked.
See attached document for visual example of C2H4 gas measurement trending the same data with Excel and Cognos gives totally different looking graph:
- Excel: An exponential and alarming increase of C2H4!
- Cognos: Difficult to notice exponential increase of C2H4 level due the different time axis (with fixed time intervals).
It is possible to add all the missing dates to the x axis if you have a calendar table and do an outer join in the report. However it is not possible to create a line to show the trend change through time. Thus we request a possibility to have same kind of XY-graphs as in Excel.
Suggested enhancement for functionality:
1) A feature that combines the points in the graph with a line even if there are null values (missing values for some dates). Line type could be either straight or smooth (existing in line graphs)
2) A feature that allows values on x axis to be shown with a selected time frame. For example in this example all the dates will be shown between a certain time frame even if there are no values for all dates.
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