Report: median number of sites a user logs into with Persona #1
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This is mostly implemented as of 0b9da9a. The dashboard retrieves data, calculates the median Controls allow segmentation by OS, browser, and locale. |
This was referenced Jun 30, 2012
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Since this report's functionality has been implemented for a while and is largely stable, I'm closing this issue. New issues should be opened for any changes or improvements. |
nmalkin
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Jul 18, 2012
The report is also converted to display the mean number of sites logged in instead of the median (closes #29). The reason behind it (from #29): Report #1 is the median number of sites a user logs into with Persona. As part of migrating to CouchDB as the backend (#27), finding the median of the data series becomes a significantly harder technical challenge. (To do it in a map/reduce framework requires a quick-select algorithm, which there doesn't seem to be a good way to do in CouchDB.) Alternately, the median value for each day could be precalculated when data arrives and then stored in the database. However, this would require either a new database (cumbersome) or a change to the data format and code of the current one (very undesirable). Calculating the mean of the dataset, however, is much easier. While the median is a more sensible value to look at (it is less sensitive to outliers), it has been agreed, before, that this entire report is not hugely meaningful. The median value itself doesn't really say anything. The only way we'd use it is to watch the number and hope it trends up. In that case, however, the mean is just about as good: we can look at it and watch its trend.
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from Bugzilla #746231
KPI Dashboard's first Key Performance Indicator report will be:
Median # of sites a user logs into w Persona
Description: How well are we doing on Persona ID uptake? On average, how many sites does our user interact with over the day? This value should climb over time and stabilize at a healthy value.
A report should have the following common features:
Common features will show up in other KPI reports
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