Collections of Stats

`Series`

A Series tracks stats that should be applied to the same data stream.

y = rand(1000)

s = Series(Mean(), Variance())
fit!(s, y)

Series
  ├── Mean: n=1000 | value=0.487914
  └── Variance: n=1000 | value=0.0811676

`FTSeries`

An FTSeries tracks stats that should be applied to the same data stream, but filters and transforms (hence FT) the input data before it is sent to its stats.

s = FTSeries(Mean(), Variance(); filter = x->true, transform = abs)
fit!(s, -y)

FTSeries
  ├── Mean: n=1000 | value=0.487914
  └── Variance: n=1000 | value=0.0811676

`Group`

A Group tracks stats that should be applied to different data streams.

g = Group(Mean(), CountMap(Bool))

itr = zip(randn(100), rand(Bool, 100))

fit!(g, itr)

Group
  ├── Mean: n=100 | value=0.0465708
  └── CountMap: n=100 | value=OrderedCollections.OrderedDict(false=>52,true=>48)