Merge pull request #10 from jeremyevans/patch-2

Remove bad check in cronbach_alpha calculation
SciRuby · Mar 18, 2015 · 3ad5888 · 3ad5888
2 parents 5618c37 + 3eaa53e
commit 3ad5888
Showing 1 changed file with 1 addition and 2 deletions.
diff --git a/lib/statsample/reliability.rb b/lib/statsample/reliability.rb
@@ -5,7 +5,6 @@ class << self
       # only uses tuples without missing data
       def cronbach_alpha(ods)
         ds=ods.dup_only_valid
-        return nil if ds.vectors.any? {|k,v| v.variance==0}
         n_items=ds.fields.size
         return nil if n_items<=1
         s2_items=ds.vectors.inject(0) {|ac,v|
@@ -150,4 +149,4 @@ def curve_field(field, item)
 require 'statsample/reliability/icc.rb'
 require 'statsample/reliability/scaleanalysis.rb'
 require 'statsample/reliability/skillscaleanalysis.rb'
-require 'statsample/reliability/multiscaleanalysis.rb'
+require 'statsample/reliability/multiscaleanalysis.rb'