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Where does this reliability coefficient come from?
The default reliability is taken from Sherman et al. (2023) and reflects internal consistency (Cronbach's alpha) values. For memory tests, internal consistency is used in preference to test-retest reliability, due to significant practice effects. Test-retest and alternate form reliability data is also relatively limited for the Meyers & Meyers version of the RCFT (see Sherman et al. (2023).
Reliability is used to calculate Estimated True Scores and confidence intervals. You can adjust this value if you have access to alternative reliability data.
Reliability is used to calculate Estimated True Scores and confidence intervals. You can adjust this value if you have access to alternative reliability data.
Assessment Results
Important Interpretation Information:
Percentiles scores are quoted to aid interpretation only, we would urge significant caution in reporting these values. Percentile calculations require the assumption that the scores are normally distributed, however the RCFT has been shown to have significantly skewed distributions ('floor' effects at low ages, 'ceiling' effects at high ages). For this reason, we recommend giving broad ranges rather than specific individual values.
Similarly, although we have calculated confidence intervals around the Estimated True Score using best-available reliability figures, these are not from paediatric populations and represent internal consistency rates only.
Norms from: Fernando K., Chard, L., Butcher, M., & McKay, C. (2003). Standardization of the Rey Complex Figure Test in New Zealand children and adolescents. New Zealand Journal of Psychology, 32(1), 33–38.
Reliability from: Sherman, E., Tan, J., & Hrabok, M. (2023). A compendium of neuropsychological tests. United States: Oxford University Press
Percentiles scores are quoted to aid interpretation only, we would urge significant caution in reporting these values. Percentile calculations require the assumption that the scores are normally distributed, however the RCFT has been shown to have significantly skewed distributions ('floor' effects at low ages, 'ceiling' effects at high ages). For this reason, we recommend giving broad ranges rather than specific individual values.
Similarly, although we have calculated confidence intervals around the Estimated True Score using best-available reliability figures, these are not from paediatric populations and represent internal consistency rates only.
Norms from: Fernando K., Chard, L., Butcher, M., & McKay, C. (2003). Standardization of the Rey Complex Figure Test in New Zealand children and adolescents. New Zealand Journal of Psychology, 32(1), 33–38.
Reliability from: Sherman, E., Tan, J., & Hrabok, M. (2023). A compendium of neuropsychological tests. United States: Oxford University Press