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That is a very good question Simon.
I currently have 20 day, 50 day, 100 day and 200 day moving averages implemented (although I also calculate other averages, I just don't currently allow you to select them for display - I may make this user configurable).
The moving average routines were originally built nearly 18 months ago - and I originally chose the numbers because this is what Yahoo offered on their charts.
If you consider that each "day" is actually a trading day, so 5 days is really a week, 20 days = 4 weeks = approximately 1 month. ), 50 day is close to 3 months, 100 day close to 6 months and 200 day close to 1 year (actually it's quite a bit less - but it's just an approximate indicator).
I watch the 20 and 50 day moving averages for short term indications and the 100 and 200 day moving averages for long term indicators. A fund that "drifts" down below the 100 day moving average is not doing much, and a fund which passes the 200 day moving average is in serious decline.
I personally don't bother with MAVs of less than 20 days, because you can't react quickly with managed funds anyway (especially if you use a margin loan) ... in my view the most "micro" view you can take with a fund is weekly - but I find a 5 day moving average to give too much detail.
It is also useful to compare funds during a correction to see if they drop below the 100 or 200 day moving average lines (and indeed, how far past they go!) - and also how quickly they get back above those lines.
I'm sure the share traders amongst us can add a lot more detail about how to use moving averages.
Unfortunately it is too processor/database intensive to calculate any arbitrary moving average figure - I pre-calculate them whenever the data is updated with new information and store that information directly in the database f... so I can only have a fixed number of moving averages available for display. If people would like to see some other numbers, please post here and I'll consider how I might make it possible for you to select other averages for display (possibly user-selectable in the control panel).
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Sim'
This is a general comment only and does not constitute advice. Before making financial decisions you should seek advice from a professional adviser, who can take into account your specific circumstances and investment goals.
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