Raw VST gain scores did not support that two hours of weekly Word Engine use produced greater gains than one hour¶

Claim · All claims
Evidence · 1 study · causal r1 · q2
Currency · newest study 2013 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Unadjusted mean gains were slightly higher for the one-hour vocabulary and ER group (1147.54) than the two-hour vocabulary group (1107.81), contrary to the dose hypothesis. → McLean 2013

Evidence¶

McLean 2013¶

McLean, S., Hogg, N., & Rush, T. W. (2013). Vocabulary learning through an online computerized flashcard site. The JALT CALL Journal, 9(1), 79-98. https://eric.ed.gov/?id=EJ1108008

q2 · i? · causal · r1

Discussion of unadjusted pre-post gains from the year-long quasi-experiment (Table 3: vocabulary+ER gain 1147.54, vocabulary gain 1107.81). The article states the raw gains "failed to provide support" for the two-hour advantage; no effect size is printed.

"the raw mean VST gain scores failed to provide support for the claim that two hours of Word Engine led to greater VST score increases than one hour, since the vocabulary and ER group actually achieved slightly higher VST score gains, as shown in Table 3."

Discussion¶

Related Claims¶

• Adjusted posttest VST means were ordered by time spent using the word card program, with the two-hour group highest — reports the opposite
• Classes assigned weekly Word Engine online flashcard use gained significantly more on the VST than an extensive-reading control class over one academic year, in a quasi-experiment with acknowledged selection and time-on-task confounds — a broader claim this one bears on
• Number of correctly retrieved and acquired Word Engine items each correlated moderately with VST score gains — related