require 'statsample'

Statsample::Analysis.store(Statsample::Regression::Multiple) do
  Daru.lazy_update = true
  
  samples=2000
  ds = Daru::DataFrame.new({
    :a  => rnorm(samples),
    :b  => rnorm(samples),
    :cc => rnorm(samples),
    :d  => rnorm(samples)}, clone: false)
  attach(ds)
  ds[:y] = a*5+b*3+cc*2+d+rnorm(samples)
  
  # REMEMBER: It is _mandatory_ to call #update after assingnment cycles if your 
  # operations to be performed as expected.
  ds.update
  summary lr(ds,:y)
  
  Daru.lazy_update = false
end
Statsample::Analysis.run_batch