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Rather, rater separation reliability is a measure of how different the raters are.
A degradation in separation reliability due to tight gap distance is observed in separation experiments.
Reliability of each final form of the TRC-n and TRC-e was examined by computing Rasch coefficients for the Person Separation Reliability (PSR) and Item Separation Reliability (ISR), and the Kuder-Richardson formula 20 (KR20).
The dimensions all have moderately acceptable reliability: expected a posteriori/plausible value (EAP/PV) separation reliability indices range from 0.62 to 0.67.
To document construct reliability, a Person Separation Reliability Index (analogous to Cronbach's alpha; Bond and Fox 2001) was calculated in Winsteps (Linacre 2012).
Person Separation Reliability measures the replicability of the ordering of persons (by ability) if they were given another instrument measuring the same construct (in this case tree-thinking skills).
Using the EAP/PV separation reliability statistic, the reliability indices for the 4 dimensions in the LPDI are between 0.62 and 0.67, and the indices for the eight dimensions of the CTSR are between 0.64 and 0.72.
We had a relatively low Person Separation Reliability index (0.34 for the group analyzing a tree and 0.44 for the group building a tree) implying that we had too few questions and too many students of high ability to closely parse out student ability (Bond and Fox 2007; see Additional file 1: Figure S1 and Additional file 1: Figure S2).
Person separation reliability coefficient was 0.89.
Furthermore, the person separation reliability was 0.94.
ICC is similar to Rasch separation reliability.
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