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Scoring Service API
Assigns an ability estimate to an assessment-taker in the form of a Lexile Reading, El Sistema Reading, or Quantile measure.
About Scoring Service REST API
Reporting Scoring Service Measures
The Scoring Service API uses the Lexile® and Quantile® frameworks to calculate student measures (called ability in the API response).

APIs
- Scoring Service API
  Assigns an ability estimate to an assessment-taker in the form of a Lexile Reading, El Sistema Reading, or Quantile measure.
  - About Scoring Service REST API
    - Service Level Agreement for Scoring Service API
    - High Availability
      High Availability (HA) of MetaMetrics® Services.
    - Bayesian Scoring Theoretical Foundations
      Everyone has heard the maxim “the best predictor of future behavior is past behavior.” Bayesian Scoring is a statistical approach for predicting a student’s test score by incorporating both the student’s prior test scores and the uncertainty associated with all measures into an adjustment to the current score. The more confident we are about the prior information, the smaller is the standard deviation of the prior information (Yen and Fitzpatrick, 2006). The result is that the adjusted score is a more accurate measure of the student’s “true” ability level. The MetaMetrics Scoring Service API is a scoring technology that updates student ability measures – Lexile or Quantile measures. Calculations are made by incorporating historical student performance data and current test experiences to estimate new, more refined ability estimates.
    - Reporting Scoring Service Measures
      The Scoring Service API uses the Lexile® and Quantile® frameworks to calculate student measures (called ability in the API response).
    - Scoring Service Response Codes
    - Scoring Service REST API FAQ
      The process of scoring student assessments and reporting results has evolved greatly over the years. From teachers sitting with paper-based answer sheets to bubble-sheets fed through a machine that produces a percent correct, technology has helped to enhance the process of scoring tests. While percent correct on an assessment can be valuable, many assessments benefit from reporting an estimate of the underlying student ability in an educational construct. These ability estimates provide indicators of status and can be used to monitor growth over time.
  - API Calls
  - Service Level Agreement for Scoring Service API
- Lexile Text Analyzer API
  Analyzes text to produce Lexile text measures on custom content.
- Titles API
  Access more than 470,000 hardcover, e-books, paperback, trade and other titles.
- Forecasting API
  Forecast an individual student or group performance on an upcoming assessment.
- Growth Planner API
  Plot a student's projected growth using Lexile or Quantile measures.
- Oral Reading API
  Measures a student's oral reading ability and the oral readability of text on the same scale.
- PowerV API
  Create and access vocabulary lists for over thousands of titles with the Titles Database.
- Career Database API
  Identify a career’s reading and math demands in Lexile and Quantile metrics for goal setting and career preparedness.

Reporting Scoring Service Measures

The Scoring Service API uses the Lexile® and Quantile® frameworks to calculate student measures (called ability in the API response).

For detailed information about each framework represented in the Scoring Service API see:

The calls in the Scoring Service API return a measure and uncertainty. If the measures are being used for research or institutional purposes, they can be used as reported. Measures provided by the standard calls can also be used when making Bayesian calls.

If the measures are used for reporting to teachers, parents, and students then proper branding needs to be applied. To do this:

Round the measure to the nearest 5th integer. For example if
- A measure is 572 it should be rounded to 570.
- A measure is 577 it should be rounded to 575.
Add L (for Lexile) or Q (for Quantile) to the end of the measure. For example: 575Q
If a measure starts with - (negative sign) replace the negative sign with
- BR (for Lexile or El Sistema reading). BR stands for Beginning Reader.
- EM (for Quantile). EM stands for Emerging Mathematician.
For example BR100L
MetaMetrics may provide additional rules for some Assessment Products. Please check with the person assigned to your program if the following rules should be applied:
1. Minimum and maximum reported scores, referred to as scale caps. For information about capping percentiles by grade see:
  - Table 1 in Reporting Lexile Reading and Text Measures.
  - Table 1 in Reporting Quantile Student Measures for Students and Materials.
  - Table 1 in Reporting Spanish Lexile Reading and Text Measures.
2. Measure ranges:
  1. The lower Lexile range is -100L
  2. The upper Lexile range is +50L
  3. The lower Quantile range is -50Q
  4. The upper Quantile range is +50Q
  5. Example. If the result returned from the service for a Lexile measure is 843, then the reported measure is 845L, and the range is 745L - 895L
  6. The highest and lowest observed reported scores apply to ranges as well. Reported scores should not exceed these values.
    Note: For example: The result returned from the service for a Lexile measure is 1472 for a student in grade 6. The reported measure is 1470L, and the lower range is 1370L, but the upper range is bounded by the scale cap of 1500L.