Page 171 - DEDU504_EDUCATIONAL_MEASUREMENT_AND_EVALUATION_ENGLISH

Unit 12 : Conversion of Raw Scores into Standard Scores, T-scores, C-scores, Z-scores, Stanine Scores, Percentiles

made by joining the two classes on either side of C-scale. So, the range of score of points 1 and Notes
9 is 1.002, and for remaining 7 classes (2 to 8) is 0.052. These groups are sequential, that is, the
second group is better than the first one, and the third is better than the second, and in the same
way, the ninth group is better than the eighth.
Calculation of Stanine Scores
Stanine scores can be obtained using any of C-scores, percentile rank (PR) and T-scores. We have
already discussed the methods of calculating C-scores, percentile ranks (PR) and T-scores. Having
known the varue of anyone of them, the table 4 is used to find out the value of Stanine score.
Table—4
Stanine Score, C-Score, Percentile Rank, T-Score Table
Stanine Scores C-Scores Percentile Rank T-Score

9 9 -10 96 - 100 67.5 +
8 8 89 - 96 62.5 - 67.5
7 7 77 - 89 57.5 - 62.5
6 6 60 - 77 52.5 - 57.5
5 5 40 - 60 47.5 - 52.5
4 4 23 - 40 42.5 - 47.5
3 3 11 - 23 37.5 - 42.5
2 2 4 -11 32.5 - 37.5

1 0 - 1 1 - 4 less than 32.5
Utility of Stanine Scores
Only 9 numbers are used in Stanine, while 11 in C-score. So the analysis of these scores is easier
than those of C-scores. The meaning of Stanine scores is generally taken as follows :
Table—5

Meaning of Stanine Scores
Stanine Score Interpretation

9 very good
7 – 8 good
4 – 6 average
2 – 3 low
1 very low
In the classes on edges (classes 1 and 9) of Stanine scores, the score fall 4 – 4% which are not
according to rules. There are strong possibilities of committing error on classifying on its basis.
Another shortcoming in it is that the best 1% students are placed in the lower 3% students, so
these cannot be used for giving guidance.

12.7 Percentile Scores

A percentile score is another type of converted score. Your raw score is converted to a number
indicating the percentage of the norm group who scored below you. For example, a score at the

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