My Health Software, Support Forum » Rolling/floating averages vs Fixed averages
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Support Forum Topic: Rolling/floating averages vs Fixed averages
Started by: Steve (My Health Software Support)
Date: June 15, 2009

I received this question by email. If anyone comes across this in the future and has any thoughts or suggestions, please reply or email me.

> product very much. One suggestion: the averages seem to start
> fresh on Monday instead of being rolling averages. That is, it
> looks as if the Monday am average does not include reeadings
> back to the previous Monday evening but just readings since the
> beginning of the “week”, which I suspect was Sunday midnight.

As an aside, you can control what is considered the first day of the week for this average by clicking on the “Change Options” task (on the “Home” page), then clicking on “Appearance”. In the “Time format” section, you can choose which day is the first of the week as well as whether you are in the northern or southern hemisphere (which changes the labeling of the seasonal averages).

> Rolling averages might be more intuitive and useful.

At the time I was implementing this, I did consider having rolling averages. I do agree that a rolling average is more intuitive and useful for the current period, but I felt that when looking back at historical readings, using fixed periods was more intuitive and useful.

Take for example a monthly average. To see an average for the last 30 days of readings, and even to be able to compare that to the previous 30 days of readings is useful. However to be able to look back at a previous years data and see the averages for the actual months (rather than rolling 30 day periods), to my mind is easier to relate to and more meaningful.

I think that the longer the period (ie monthly/seasonal/year) and the more historical data that is available, the more useful fixed periods are compared to floating periods. The smaller the period (ie weeks) the easier it becomes to argue that floating periods would be better.

I have made a note of this for a future version and I will look into either switching the small periods to a rolling/floating system, or offering both.

Also I have posted this on our community forum to see if others are interested in this or have any comments.

For what it is worth, you can always see the latest rolling average for any number of days, by adding a “Group”. To do this, click on “Study readings”, then click on the “Group” tab. Then click on the “Add new group…’ task. In the “Date Filter”, choose “Days back” and then choose how many days back you want the average to be calculated.



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