**Summary**

The subject specific STAAR Raw Score mean and standard deviation (2018-2019 Technical Digest) are used to convert individual student raw scores into standardized z-scores. A standard z-score is a raw score expressed in terms of how many standard deviations it is away from the population mean.

The Standard Score Subject Comparison Report is used to evaluate students’ performance on two distinct STAAR tests using a standard score as defined above. To be included in this report, a student must have at least 2 scores, one for each test identified in the filter.

**Usage**

Each student standard score is identified by one point on the coordinate plane. The x-axis represents his/her performance on one assessment, while the y-axis is his/her performance on the other, the point represents where the two individual scores intersect. The standard score (z-score) is compared to the performance of the population in the state. By definition, the average standard score of the population in the state would be 0. Any number greater than 0 equals greater than average performance as compared to the population in the state. Conversely, any number less than 0 would equal less than average performance as compared to the population in the state. There are nine sections of the coordinate plane as identified from top left to bottom right.

T = Top ? B = Bottom ? M = Middle ? L = Left ? R = Right

- (TL) Above Average in Subject 1; Below average in subject 2
- (TM) Above Average Subject 1; Average Subject 2
- (TR) Above Average Both
- (ML) Average Subject 1; Below Average Subject 2
- (MM) Average Both
- (MR) Average Subject 1; Above Average Subject 2
- (BL) Below in Both
- (BM) Below Average Subject 1; Average Subject 2
- (BR) Below Average Subject 1; Above Average Subject 2

**Data Sources**

STAAR

- Raw Scores (Students must have a raw score on record for both the previous and current year on the same test version, to be included in this report)
- STAAR Mean (2018-2019 Technical Digest)
- STAAR Standard Deviation (2018-2019 Technical Digest)

**Definitions**

- Average Raw Score: The average calculated by summing all the values in a data set and dividing by the number of cases.
- Standard Score: A raw score expressed in terms of how many standard deviations it falls away from the mean (also known as z-score).
- Standard Deviation: Tells the average distance by which average scores deviate from the mean.
- Scatter Plot:
- point: Where 2 standard scores intersect for 1 student (students must have a raw score on record for both the previous and current year on the same test version, to be included in this report).
- x-axis: Standard Score of 1st test (Subject 1) for each student
- y-axis: Standard Score of 2nd test (Subject 2) for each student
- Yellow Plot lines: Denote the area within +/- one standard deviation of the mean. By definition, the average standard score of the population in the state would be 0. Any number greater than 0 equals greater than average performance as compared to the population in the state. Conversely, any number less than 0 would equal less than average performance as compared to the population in the state.
- From 0 to +/- 1 = 68% of the population
- From +/- 1 to +/- 2 = 27% of the population
- From +/- 2 to +/- infinity = 5% of the population

- z-Score: A raw score expressed in terms of how many standard deviations it falls away from the mean (also known as standard score).

**Features**

Student List: Drills down to list of students who fall within that section of the coordinate plane.

**Filters**

Single-select (One for each test):

- Subject
- Year
- Grade
- Campus
- Version
- Admin Month
- Language
- Test Admin Mode
- Ethnicity (Optional)
- Special Population (Optional)

Single Select:

- Focus List (Optional)