The WWC rated Arthur as having potentially positive effects rather than positive effects because only one study met evidence standards and it lacked a strong design¶

Claim · All claims
Evidence · 1 study · causal r? · q2
Currency · newest study 2006 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Arthur received the rating of potentially positive effects: at least one study showed a substantively important positive effect and no studies showed statistically significant or substantively important negative effects, but the criteria for positive effects were not met because there was only one study and it lacked a strong design. → 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

q2 · i? · causal · r?

The WWC intervention rating scheme requires two or more studies showing statistically significant positive effects, at least one with a strong design, for a positive effects rating. For Arthur, "the study lacked a strong design" despite a substantively important average effect size, so the highest applicable rating was potentially positive effects.

"It did not meet the criteria for positive effects, because it only had one study. The remaining ratings (mixed effects, no discernible effects, potentially negative effects, and negative effects) were not consid-ered because Arthur was assigned the highest applicable rating."

Discussion¶

Related Claims¶

• Watching Arthur improves English narrative skill development in kindergarten English language learners more than an alternative educational program (potentially positive effects) — possibly the same claim (merge candidate)
• The WWC rated JOBSTART as having potentially positive effects on completing school, based on a small extent of evidence from a single study — related
• The WWC rates The Expert Mathematician as having potentially positive effects on middle school mathematics achievement — 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