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Test-retest reliability refers to the ability of an instrument to produce consistent measurements across testing occasions.
The summer effect contrasts children's scores on the second and third testing occasions, which represent the change during the summer prior to kindergarten, as shown in contrast C2.
In our study the mean difference between the two testing occasions was 1.59 (not statistically significant), and the LOA was between −10.50 and 13.68.
Reliability is the consistency with which an instrument provides similar results across items, testing occasions, and raters (Cronbach 1947; Nunnally 1967).
In example 1, we illustrate how the reliability of didactic course grades is affected by the length and number of examinations (i.e., more testing occasions).
The only other cross-cultural adaptation study reporting LOA values is the Brazilian validation study [19], with a mean difference between testing occasions of only 0.50 and LOAs between −6.1 and 7.1.
Similar(35)
At the end of the first testing occasion, she scheduled a time for her second testing occasion (with a minimum of a 48 hour time lapse).
The proportion of indeterminate sputum results was less than 1.5% on any testing occasion.
In other words, each participant's scores is entered four times: once for every testing occasion.
As per the exclusion criteria, participants underwent urine drug screening on each testing occasion.
Two tests will be conducted on each testing occasion using a standardised protocol [ 36], with the greatest distance recorded.
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