Two approaches (interventions) are compared for increasing the "up-to-date" immunization rate in 19- to 35-month-old children. 16 counties in Colorado 1:1 are randomized to either a population-based approach or a practice-based approach. Ahead of randomization, several county-level variables are collected, and a subset of them are used for covariate constrained randomization. The continuous variable of average income is categorized to illustrate the use of cvcrand on multi-category variables. And the percentage in CIIS variable is truncated at 100
A data frame with 16 rows and 7 variables:
the identification for the county
urban or rural
percentage of children aged 19-35 months in the Colorado Immunization Information System (CIIS)
number of children aged 19-35 months
percentage of children already up-to-date on their immunization
percentage of African American
percentage of Hispanic ethnicity
average income categorized into tertiles
pediatric practice-to-family medicine practice ratio
number of community health centers
Dickinson, L. M., B. Beaty, C. Fox, W. Pace, W. P. Dickinson, C. Emsermann, and A. Kempe (2015): Pragmatic cluster randomized trials using covariate constrained randomization: A method for practice-based research networks (PBRNs). The Journal of the American Board of Family Medicine 28(5): 663-672
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