What is an add-on area?
An add-on area is either a state or a planning organization that purchased additional sampling of households in its state/area to be surveyed. The rationale is to increase the number of sample households in the state/area so that trip rates and travel statistics can be reliably estimated at that geographic level. Four states and five planning areas purchased additional samples in the 2001 survey, adding over 40,000 sample households to the NHTS. The add-ons and the target sample sizes were: • State of Wisconsin: 16,000 households • State of New York: 10,884 households • State of Texas: 3,500 households • State of Hawaii: 1,500 households • Kentucky 4 county area: 1,000 households • Baltimore, MD: 3,471 households • Des Moines MPO, IA: 1,200 households • Lancaster MPO, PA: 1,000 households The final sample size for the 2001 NHTS was targeted at 65,055 = (25,000 for the national sample + 40,055 for the add-on samples) households. Statistically developed sample weights (i.e., factors that
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