Study Shields et al. (2009): study AU 2001
- Public
 - 15+ aged general public, Australia, 2001
 - Survey name
 - AU-HILDA 2001
 - Sample
 - Respondents
 - N = 13903
 - Non Response
 - 34%
 - Assessment
 - 
        Interview: face-to-face                    
Additionally self-completion questionnaires were used. 
Correlate
- Authors's Label
 - Number of parents
 - Our Classification
 - 
            
 - 
                        
 - Distribution
 - Males: M=2.34 SD=.98; Females: M=2.26 SD=.99
 - Related specification variables
 - 
                
 - 
                            
 - Operationalization
 - Retrived from the number of people filling out the questionnaire in a household
 
Observed Relation with Happiness
OPRC's controlled for:
- neighbourhood fixed effects (unobserved characteristics of the neighbourhood)
- age and age squared
- number of children
- marital status
- being an Aborginal/Torres Strait Islander
- being an immigrant
- English speaking ability
- health
- education
- employment status
- household income
- house ownership
- religion
- frequency-preference of paying bills
- suspicious of interview questions
- others present during interview
- respondent was living with both parents
at age 14