A psychological test refers to a systematic procedure for comparing the behaviour of two or more people. Standardization refers to collecting a sample for the purpose of norm-referencing and it refers to the administration of a measure according to a consistent set of rules. A standardized administration is necessary to produce reliable and valid measurement. A diagnostic schedule (e.g. rating scale) refers to a specialized psychometric method that provides a structured procedure for collecting and categorizing behavioural data that corresponds to diagnostic categories or systems. It is used to diagnose a syndrome. The goal of an instrument determines whether it is a diagnostic schedule (e.g. diagnose or not). Rating scales allow for the rapid and accurate identification of domains of behaviour that may require diagnosis or intervention.There are several definitions used when testing children:Raw scoreThis refers to the sum of the item scores on a certain measure and does not give any information of performance compared to a norm-group. Standard score This refers to a raw score that is converted to a distribution that reflects the degree to which the individual has scored below or above the sample mean.T-scoreThis is a type of standard score with a mean of 50 and a standard deviation of 10.Linear T-scoresThis is a type of score which maintains the skewed shape of the raw score distribution, meaning that the relationship of percentile ranks to T-scores is unique for each scale. Uniform T-score (UT)This is a type of standard score which maintains the skewness of the original raw score distribution to ensure that the relationship between percentile ranks and T-scores is constant across scales.Scaled scoreThis is a type of standard score with a mean of 10 and a standard deviation of 3.Percentile rankThis refers to a person’s individual relative position within a norm group but has unequal units along their scale (e.g. the...
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