About the Measure

Domains Literacy
Subscales Phonological awareness, letter recognition, fluency, vocabulary and comprehension
Target Construct Literacy: Components of reading (phonemic awareness, phonics, fluency) Oral language: vocabulary, comprehension.
Description One main purpose of ERDA-R is to identify children at risk for not meeting grade-level expectations in reading. Another purpose is to provide teachers with a tool to assist in planning instruction.
Test Authors The Psychological Corporation
Publisher Pearson (2003)

Implementation details

Respondent Child
Prior knowledge Required Teachers can administrate
Scoring Reported as manageable and accessible
Time 45–60 minutes, including 15–20 minutes for screening
Age 5 years to 8 years

Psychometric details

UK norms YES
Norm / Criterion referenced Both
Standardisation sample 800
Reliability Fall split half estimates range from 0.63 to 0.95 and Spring overall estimates range from 0.61 to 0.96. Spring interrater reliability 0.88; fall interrater reliability 0.96
Criterion validity Insufficient data in the public domain to evaluate
Construct validity Insufficient data in the public domain to evaluate
Concurrent validity A study comparing the scores of 47 grade 2 and grade 3 students with a diagnosed learning disability in reading with same grade counterparts. ERDA-2 differentiates students with reading disabilities from students without them.