Method: Statsample::StratifiedSample#standard_error_wor

Defined in:
lib/statsample/multiset.rb

#standard_error_wor(field) ⇒ Object

Standard error with estimated population variance and without replacement. Source: Cochran (1972)

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# File 'lib/statsample/multiset.rb', line 254

def standard_error_wor(field)
  es=@ms.collect_vector(field) {|s_n, vector|
    {'N'=>@strata_sizes[s_n],'n'=>vector.size, 's'=>vector.sds}
  }
  
  StratifiedSample.standard_error_esd_wor(es)
end