The average improvement index for Arthur in English language development is +11 percentile points, ranging from –5 to +17 across findings¶

Claim · All claims
Evidence · 1 study · causal r? · q3 · i1 small
Currency · newest study 2006 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i1 Across the three English language development outcomes, the WWC computed a domain average effect size of 0.29 (ns) and an average improvement index of +11 percentile points, with a range of –5 to +17. → Arthur (WWC Intervention Report) 2006

Evidence¶

Arthur (WWC Intervention Report) 2006¶

Arthur (WWC Intervention Report). (2006). What Works Clearinghouse, U.S. Department of Education. http://pbskids.org/arthur/index.html

q3 · i1 · causal · r?

WWC calculations across the Uchikoshi randomized controlled trial's three outcomes (combined narrative measure, total number of words, mean clause length) yield a domain average effect size of 0.29, ns, corresponding to the +11 average improvement index. The improvement index is "entirely based on the size of the effect, regardless of the statistical significance."

"The average improvement index is +11 percentile points, with a range of –5 to +17 percentile points across findings, for the English language development domain."

Discussion¶

Learner Variables¶

• English-Learner Status — outcome: instruction changes it
• Oral Language — outcome: instruction changes it

Related Claims¶

• Peer Tutoring and Response Groups has positive effects on English language development for English language learners, with an average improvement index of +17 percentile points — related
• Enhanced Proactive Reading shows no discernible effects on English language development — related
• The WWC rates Instructional Conversations and Literature Logs as having potentially positive effects on reading achievement and English language development — related
• Mean clause length showed a small negative difference favoring the comparison group, not statistically significant — related
• Watching Arthur improves English narrative skill development in kindergarten English language learners more than an alternative educational program (potentially positive effects) — related
• The supporting evidence is a randomized controlled trial in which 108 kindergarten English learners watched 54 episodes of Arthur or Between the Lions over one school year — related
• The WWC improvement index is +31 percentile points for English language development and +3 percentile points for reading achievement — reports the opposite