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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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