Understanding Standard Scores
Standard scores are a way to compare your child's performance to that of a norm group. They are often used in educational assessments to provide a clear picture of how a student is doing relative to peers.
A standard score is typically based on a scale where the average score is set at 100, with a standard deviation of 15. This means most students score between 85 and 115.
Interpreting Percentiles
Percentiles indicate the percentage of students in the norm group who scored below your child. For example, if your child is in the 75th percentile, they scored better than 75% of the norm group.
Percentiles are useful for understanding where your child stands in a broader context, but they don't indicate how much better or worse the performance is compared to others.
Comparing Standard Scores and Percentiles
While both standard scores and percentiles provide valuable information, they serve different purposes. Standard scores are more precise in showing how far above or below the average a student's score is.
Percentiles, on the other hand, are easier for many to understand at a glance but can be less precise in conveying the magnitude of difference from the norm.
Common Assessment Tools
Several standardized tests use these scoring methods, including the WISC (Wechsler Intelligence Scale for Children) and the Woodcock-Johnson Tests of Achievement.
Each test may have its own norm group and scoring scale, so it's important to understand the specific context of the scores you're reviewing.
Why Scores Matter
Understanding these scores can help you advocate more effectively for your child's educational needs. They can highlight areas of strength and areas where additional support may be needed.
Scores can also help track progress over time, providing a measure of how well interventions are working.
Next Steps After Evaluation
Once you understand the scores, the next step is to discuss them with your child's educational team. This can include teachers, school psychologists, and other specialists.
Use the scores to inform discussions about IEP goals, accommodations, and any additional services your child may need.
Practical tips
- Review the assessment report thoroughly and note any questions you have.
- Ask the school psychologist or evaluator to explain any scores you don't understand.
- Compare your child's scores to previous evaluations to track progress.
- Use the scores to inform IEP meetings and goal setting.
- Keep a copy of the evaluation for future reference.
Common mistakes to avoid
- Confusing percentiles with percentages, which are not the same.
- Assuming a low percentile means failure; it indicates relative standing, not absolute performance.
- Overlooking the importance of standard deviations in understanding standard scores.
- Ignoring the context of the norm group used for the assessment.
Frequently asked questions
- What is a standard score?
- A standard score compares your child's performance to a norm group, typically with an average of 100 and a standard deviation of 15.
- How is a percentile different from a percentage?
- A percentile indicates the percentage of peers a child scored better than, while a percentage is a simple fraction of correct answers.
- Why are standard scores important?
- They provide a precise measure of how far above or below the average a student's performance is, helping identify strengths and needs.
- Can I request a meeting to discuss evaluation results?
- Yes, you can request a meeting with the school to discuss the evaluation and its implications for your child's education.
- How often should my child be re-evaluated?
- Re-evaluation timelines can vary, but typically every three years for special education services. Check your state's guidelines.