Method: Statsample::StratifiedSample.proportion_sd_ksd_wr

Defined in:
lib/statsample/multiset.rb

.proportion_sd_ksd_wr(es) ⇒ Object 



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# File 'lib/statsample/multiset.rb', line 176

def proportion_sd_ksd_wr(es)
  n_total=calculate_n_total(es)
  sum=es.inject(0){|a,h|
    val= (h['N']**2 * h['p']*(1-h['p'])) / h['n'].to_f
    a+val
  }
  Math::sqrt(sum) * (1.0/n_total)
end