Exploring standard scores for the WISC-III using modern methods

Timothy D White, Tennessee State University


The methods for transforming raw scores into standard scores on individual tests are examined in two experiments. Traditionally, scores are transformed with a normalizing process based on percentile conversions. A method for transforming scores based on modern methods is proposed and evaluated. In experiment one, Monte Carlo simulations were used to generate significantly nonnormal distributions due to small sample size, skewness, and kurtosis. Kolmogorov-Smirnov tests were employed to compare the goodness of fit of the transformed distributions with the raw scores distributions. Results indicated that transformations based on modern methods provide a better fit for the data than the traditional method. However, transformations based on modern methods made no progress toward normalizing the distributions. Experiment two examined the efficiency of traditional transformations on 100 WISC-III profiles collected from the public school system's archival data. Results indicate excessively unsmooth progression of scores.

Subject Area

Psychological tests

Recommended Citation

Timothy D White, "Exploring standard scores for the WISC-III using modern methods" (1999). ETD Collection for Tennessee State University. Paper AAI9943854.