Finally, intervention variables d j,t are dummy (indicator) variables that are used to capture structural breaks or outlying (irregular) observations.
The program also created dummy or indicator variables for categorical variables that were not initially dichotomous.
From location dummies (indicator variables), households at Halaideghe rangeland were less likely to use P. juliflora than those from Worer, whereas higher likelihood was observed for Gewane households than Worer.
The predictors in the model will include a dummy coded time effect and an indicator variable for the intervention interacting with the time effect.
To do so, besides including an indicator variable for holding a PC among the set of controls, we add an interaction between this indicator and a step dummy variable taking the value 1 from 1999 to 2001.24 In line with the notation used earlier, we label this step dummy as F2.
The predictors in this model will include a dummy coded time effect and separate indicator variables for the Provider and Patient interventions interacting with the time effect.
In addition to monthly MSA unemployment rate, the base regression includes indicator variables for education (5 dummies for 6 categories), age (9), gender, marital status (2), children in household (2), foreign born (2), union member, public employment, hours on primary job (6), industry (12), occupation (16), region (8), MSA size (5), month, and year dummies.
In addition to the regressors shown, the base regression includes indicator variables for education (5 dummies for 6 categories), age (9), gender, marital status (2), children in household (2), foreign born (2), union member, public employment, hours on primary job (6), industry (12), occupation (16), region (8), MSA size (5), month, and year dummies.
We also include indicator variables for usual diagnostic place and type of treatment, and, in some specifications, a dummy for NCMS membership.
To ascertain whether the associations with blood lead differed across neurobehavioral domains (anxiety, sociability, ADHD index, and global executive composite score), we treated the Z-scores as repeated measures of neurobehavior and added an indicator (dummy) variable for each neurobehavioral domain.
