Besides, having spent my childhood in Westchester, where business and residential numbers are intertwined, I learned early on to take wrong numbers in stride.
Such calls usually go through from residential numbers, on the assumption that they can always be charged back to the calling phone.
Although residential numbers increased through time, the percentage of residents in the lahar-hazard zone across the five Washington volcanoes (Figure 6b) remained the same between 1990 and 2010 (4.4% and 4.3%, respectively).
"Carriers must put residential numbers back into use within 90 days," said Mark Wigfield, a Federal Communications Commission spokesman.
All residential numbers in the community were eligible, and the CATI system released the telephone numbers randomly.
The LA-RDD sampling frame was created by using four digit prefixes that contained connected residential numbers from the EWP.
Among the 20,802 working residential numbers identified from the RDD sample, each of 3,553 households had a child meeting the eligibility criteria.
To maximize the chances of reaching residential numbers, seed numbers used for dialing included the area code plus the first five digits of the study's cases and all cancer cases diagnosed in Marin County in 1998.
Of the 820 meeting the matching criteria, 122 did not have a matching case available, 102 mothers refused to participate, and 526 agreed to participate (2.5% of the 20,802 working residential numbers or 83.8% of the 628 eligible control children for whom a matching case child was available).
To address the minority attrition, a sample of 598 Black adolescents (in the same age range) were recruited through lists of residential numbers for US census tracts for which African-Americans represented 20% or more of the population, resulting in an available sample of 3653 for this study.
