Re: [rules-users] [drools-fusion] Detecting a Trend in Data
Quick ideas (not tested):
1) Detect an always increasing trend:
ensure that no previous value - possibly scoped by a sliding window - is
greater than the current
$current : MyPoint( $val : value )
not MyPoint( value > $val, this before $current ) over window:length(3)
2) A more robust approach, allowing for some noise:
create a custom accumulate function that computes a (linear) regression
and returns a
data structure with the basic output parameters (regression
coefficients, confidence intervals, etc..)
You would then constrain on that... something like
when
LinearRegressionData( k > .... ) from accumulate ( $x : MyPoints()
over window:length(3),
myCustomLinearRegressionAccumulateFunction $x ) )
then
Other options might be possible
Davide
On 11/03/2013 10:21 AM, code4dc wrote:
Hey guys,
I am trying to come up with a way to get Drools to detect a trend in a
dataset. The data is very basic and looks something like this:
(each row represents an object in the WM)
Time Value
10:00 1
11:00 2
12:00 3
01:00 1
02:00 3
04:00 4
05:00 5
06:00 3
I want to set up a rule that detects when there is an upward trend in the
value for 3(configurable) or more consecutive data points.
It's easy to set up a rule to detect when there is a two consecutive rows
and the 2nd one has a higher value. But how can I set up a rule to detect
when there are multiple consecutive rows each with a higher value than the
previous one?
Any ideas are welcome(even if they are not complete!).
Thanks
--
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