Statistical Functions in Cache

There is a simple regression calculator that is used internally for similar trend line work, iirc. The class reference is not spectacularly elaborate, but it's fairly straightforward to use. First you use the add() function to load up points and then the result() function will calculate a simple trend line and populate Slope and Intercept properties:

USER>s stat = ##class(%DeepSee.extensions.utils.SimpleRegression).%New()

USER>w stat.add(0,1)
1
USER>w stat.add(1,2)
1
USER>w stat.result(.b,.y0,.r)
1
USER>zw b,y0,r
b=1
y0=1
r=1
USER>w stat.Slope
1

you can keep adding data and re-calculate:

USER>w stat.add(1,1)
1
USER>w stat.result(.b,.y0,.r)
1
USER>zw b,y0,r
b=.5
y0=1
r=.5