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The Northwest Evaluation Association (NWEA) [1] [2] is a division of Houghton Mifflin Harcourt (acquired by HMH in 2023) that creates academic assessments for students pre-K-12. NWEA assessments are used by over 50,000 schools and districts in 149 countries. [ 3 ]
The reason for the choice of the number 21.06 is to bring about the following result: If the scores are normally distributed (i.e. they follow the "bell-shaped curve") then the normal equivalent score is 99 if the percentile rank of the raw score is 99; the normal equivalent score is 50 if the percentile rank of the raw score is 50;
Numeric scores (or possibly scores on a sufficiently fine-grained ordinal scale) are assigned to the students. The absolute values are less relevant, provided that the order of the scores corresponds to the relative performance of each student within the course. These scores are converted to percentiles (or some other system of quantiles).
The figure illustrates the percentile rank computation and shows how the 0.5 × F term in the formula ensures that the percentile rank reflects a percentage of scores less than the specified score. For example, for the 10 scores shown in the figure, 60% of them are below a score of 4 (five less than 4 and half of the two equal to 4) and 95% are ...
Prior to the 2021-2022 school year, the point system included three categories, each weighted at 300 points instead of the current 450. Instead of the CPS High School Admissions Test, the district used the Selective Enrollment High School exam, and the third category was based on the students' percentile score on the NWEA MAP test. [52]
A confidence interval approach is also used, where after each item is administered, the algorithm determines the probability that the examinee's true-score is above or below the passing score. [16] [17] For example, the algorithm may continue until the 95% confidence interval for the true score no longer contains the passing score. At that ...
Raw scores for all scales of the BRIEF questionnaire can be computed with the Software Portfolio (BRIEF-SP). This computer program provides separate normative tables for both the Parent and Teacher Forms in which figure T scores, percentiles, and 90% confidence intervals for four developmental age groups (5–18 years) by gender of the child. T ...
Norms provided for the 1978 edition include standard scores with a mean of 100 and a standard deviation of 15, percentile scores, and grade levels. The standard scores are scaled based on the norm group; the grade levels are arbitrarily assigned and can be interpreted only as rough references to achievement level.