Psychological Profile Tests - Essay Example

The test-retest reliability for the GESS score has been analyzed by comparison of the data from two administrations of this test to identical subjects.  The scatter plots of these two sets of data shows a nearly identical pattern.  The slope of each best-fit line for the each data set is nearly identical, as is the Mean and Standard Deviation.  Because the slopes of the best-fit lines are positive numbers close to a correlation coefficient of +1, 0.94 for GESS 1 and 0.66 for GESS 2, there is a strong positive correlation between these measurements.

  The values obtained for the slopes of the GESS 1 and GESS 2 data suggest a high level of test validity.  A direct relationship is shown to exist between GESS 1 and GESS 2 and this is a very powerful indication of reliability.  From all of these observations, the GESS test appears to be highly reliable and highly valid.The Cronbach’s Alpha value is 0.84 for the comparison of the data between GESS 1 and GESS 2.  Cronbach’s Alpha is an important statistical analysis method that demonstrates the level of test-retest reliability.

  Empirical evidence has shown that a Cronbach’s Alpha score greater than 0.7 is necessary in order for a psychological instrument to have an adequate degree of test-retest reliability.  The high value of 0.84 obtained in this study indicates that the GESS inventory has a very strong level of test-retest reliability and is therefore a clinically usable instrument.The test-retest reliability for the ICI score has been analyzed by comparison of the data.. The current study shows that these measurements are essentially the same.

The test-retest reliability for the GESS score has been analyzed by comparison of the data from two administrations of this test to identical subjects. The scatter plots of these two sets of data shows a nearly identical pattern. The slope of each best-fit line for the each data set is nearly identical, as is the Mean and Standard Deviation. Because the slopes of the best-fit lines are positive numbers close to a correlation coefficient of +1, 0.94 for GESS 1 and 0.66 for GESS 2, there is a strong positive correlation between these measurements.

The values obtained for the slopes of the GESS 1 and GESS 2 data suggest a high level of test validity. A direct relationship is shown to exist between GESS 1 and GESS 2 and this is a very powerful indication of reliability. From all of these observations, the GESS test appears to be highly reliable and highly valid.The Cronbach's Alpha value is 0.84 for the comparison of the data between GESS 1 and GESS 2. Cronbach's Alpha is an important statistical analysis method that demonstrates the level of test-retest reliability.

Empirical evidence has shown that a Cronbach's Alpha score greater than 0.7 is necessary in order for a psychological instrument to have an adequate degree of test-retest reliability. The high value of 0.84 obtained in this study indicates that the GESS inventory has a very strong level of test-retest reliability and is therefore a clinically usable instrument.The test-retest reliability for the ICI score has been analyzed by comparison of the data from two administrations of this test to identical subjects.

The scatter plots of these two sets of data shows a