PRIDI 2013 Design
- Overall approach to data collection
- Proctored assessment and interviews
- Children ages 2 to 4
- Two sub-groups:
- Children 24 to 41 months of age
- Children 42 to 59 months of age
- Primary Sampling Units (PSUs) – established according to geographic or administrative region
- PSUs stratified as urban or rural on the basis of each country’s own definition
Secondary Sampling Units (SSUs) – households randomly selected within the PSUs
- Only one child per household was allowed to participate in PRIDI.
- If the household had more than one child ages 2 to 4, the participating child was determined via a Kish selection grid.
- At least 2,000 children per country
- 1,000 children 24 to 41 months of age
- 1,000 children 42 to 59 months of age
7,710 children in 4 countries
Data collection techniques and instruments
Child development test in domains mentioned above
- Standardized test
- One-on-one test situation
- Administered and guided by a test administrator with rich amount of incentive material for the various test assignments
- Two test forms: Form A administered to those under 42 months of age, Form B to those 42 months and older; the forms were very similar, but the overall difficulty of Form B was greater.
Contextual information about the household and the child
- Face-to-face interview, usually with the mother or female guardian
- Observations made by the interviewer with respect to the condition of the home
- Measurement of height of child
- individual interview
- development test
- The study instruments were administered in three different languages.
- The most common language: Spanish (all countries)
- Development of an international version of all assessment instruments in Spanish under supervision of the IDB
- Translation into applicable languages of instruction by participating entities
- Translation verification by linguistic and assessment experts in order to ensure equivalence with the international version
Quality control of operations
Measures during data collection
- Participants were responsible for data collection within their own respective territories.
- Standardized survey operation procedures: step-by-step documentation of all operational activities provided with manuals
- Full-scale field test of all instruments and operational procedures (in each participating country and entity)
- Provision of software tools for creating and checking data files
- Training provided for national research coordinators (NRCs) and their staff, for test administrators, etc.
Measures during data processing and cleaning
- Data processing at the IEA using Statistical Analysis
- Software (SAS)
- Testing of all data cleaning programs with simulated data sets.
- Material Receipt Database
- Standardized cleaning process
- Repetition of data cleaning and comparison of new data sets with the preceding version
- Finally, identification of irregularities in data patterns and correction
Sources - Technical documentation