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en:general:indices [02.04.2015 17:34]
oezbf2012 [Frequently Asked Questions]
en:general:indices [02.04.2015 17:34] (current)
oezbf2012 [Frequently Asked Questions]
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 The calculation of a scale index is only sensible if all items reflect the same construct. In practice you can test this by computing the correlation between the items by means of Cronbach's alpha. The calculation of a scale index is only sensible if all items reflect the same construct. In practice you can test this by computing the correlation between the items by means of Cronbach's alpha.
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 As a rule of thumb Cronbach's alpha should be above .7. However, Cronbach's alpha is highly influenced by the amount of items. Therefore a scale with only 4 or 5 items can be plausible with an alpha value of .6. As a rule of thumb Cronbach's alpha should be above .7. However, Cronbach's alpha is highly influenced by the amount of items. Therefore a scale with only 4 or 5 items can be plausible with an alpha value of .6.
  
en/general/indices.txt · Last modified: 02.04.2015 17:34 by oezbf2012
 
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