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Child human capital production: A field experiment in the Solomon Islands
Last registered on August 20, 2019

Pre-Trial

Trial Information
General Information
Title
Child human capital production: A field experiment in the Solomon Islands
RCT ID
AEARCTR-0004116
Initial registration date
August 20, 2019
Last updated
August 20, 2019 8:09 PM EDT
Location(s)

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Primary Investigator
Affiliation
UNSW
Other Primary Investigator(s)
PI Affiliation
University of San Francisco
PI Affiliation
University of Technology Sydney
PI Affiliation
Ecole Normale Superieure
PI Affiliation
University of New South Wales
Additional Trial Information
Status
On going
Start date
2019-06-06
End date
2020-08-31
Secondary IDs
Abstract
We introduce and test an early learning intervention on child-directed speech in the Solomon Islands, which aims to: (i) estimate the relative contributions of parental inputs in the child human capital production function, and (ii) identify the channels through which early childhood interventions can be effective. We provide parents with information and learning materials intended to stimulate child-directed speech. We then measure short-run (within days of the intervention) and medium-run (after 1 year) effects of the intervention on speech outcomes.
External Link(s)
Registration Citation
Citation
Cassar, Alessandra et al. 2019. "Child human capital production: A field experiment in the Solomon Islands." AEA RCT Registry. August 20. https://doi.org/10.1257/rct.4116-2.0.
Experimental Details
Interventions
Intervention(s)
We provide parents with information about the importance of child directed speech. They are also given materials they can use with their children to stimulate child directed speech at home. A control group receives no intervention. We measure speech outcomes before and after the intervention and compare them across treatment v. control.
Intervention Start Date
2019-06-06
Intervention End Date
2019-08-20
Primary Outcomes
Primary Outcomes (end points)
Words spoken to the child by adults and children. Utterances by the child. Conversational turns.
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Parental beliefs about the returns to child directed speech. Parental investment in children.
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
We assign treatment at the village level. In each village, we ask village leaders to assemble a community meeting, where we randomly select participants via public lottery. The selection criteria for attending the meeting is couples (male and female partners who consider themselves to be in a committed relationship) between the ages of 20 and 45, who have at least one child between the ages of 18 months and 3 years. We then randomly select 5 couples (10 participants) and their respective child to participate in the intervention by pulling numbers out of an urn and announcing them publicly in the community meeting.

We will conduct a follow-up 1 year after the initial intervention.
Experimental Design Details
Not available
Randomization Method
Treatment (village level) randomization done in office by a computer. Participants within each village selected via public lottery.
Randomization Unit
Village.
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
50 villages.
Sample size: planned number of observations
50 villages x 5 couples per village = 250 couples. 1 child per couple = 250 children. 2 parents per child = 500 parents.
Sample size (or number of clusters) by treatment arms
14 control villages and 36 treatment villages.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Informed by data from Weber et al. (2017) study in Senegal. We assume 0.8 power, alpha=0.05, and 25% correlation between clusters. First main outcome is words spoken to the child by the parent in a 5-minute session. Baseline mean of 228 words (SD=151). MDE=42% increase. Second main outcome is utterances by the child in a 5-minute session. Baseline mean of 35.5 utterances (SD=15). MDE=27% increase.
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
University of New South Wales HREC Executive
IRB Approval Date
2018-12-14
IRB Approval Number
HC180755
Analysis Plan

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