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Identify the true statements about intrarater agreement as a method of calculating the reliability of measures.
a. It may be calculated in instances in which there are two or more raters for a particular attribute
b. It is likely to indicate a low reliability for short time intervals between measures.
c. Its interpretation is made difficult by the time factor as reliability of the measure tends to decrease with time.
d. It may involve calculating the correlation between two sets of scores a rater has assigned to the same person across time periods.