Number of boating trips to Lake Somerville in 1980
Facility's subjective quality ranking on a scale of 1 to 5
Equals 1 if engaged in water-skiing at Lake
Household income of the head of the group Income ($1,000/year)
Equals 1 if user's fee paid at Lake Somerville
Dollar expenditure when visiting Lake Conroe
Dollar expenditure when visiting Lake Somerville
Dollar expenditure when visiting Lake Houston