Estimating the reliability of a test split into two parts of equal or unequal length.

@article{Feldt2003EstimatingTR,
  title={Estimating the reliability of a test split into two parts of equal or unequal length.},
  author={Leonard S. Feldt and Richard A. Charter},
  journal={Psychological methods},
  year={2003},
  volume={8 1},
  pages={102-9}
}
When the reliability of test scores must be estimated by an internal consistency method, partition of the test into just 2 parts may be the only way to maintain content equivalence of the parts. If the parts are classically parallel, the Spearman-Brown formula may be validly used to estimate the reliability of total scores. If the parts differ in their standard deviations but are tau equivalent, Cronbach's alpha is appropriate. However, if the 2 parts are congeneric, that is, they are unequal… CONTINUE READING

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