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Sample Description & Weighting Procedures - Principal Survey - 2006 School Health Profile

Sample Description:

All regular secondary public schools having at least one of grades 6 through 12 were included in the sampling frame. Schools were sorted by estimated enrollment in the target grades within school level (senior high schools, middle schools, and junior/senior high schools combined) before sampling. Systematic equal probability sampling with a random start was used to select schools for the survey. 4 out of 400 sampled schools were ineligible. The principal or his/her designee was surveyed in each participating school.

Response Rate:

80% - 318 out of 396 sampled eligible principals returned questionnaires. All questionnaires were usable after data editing.

Weighting:

A weight has been associated with each questionnaire to reflect the likelihood of a principal being selected, to reduce bias by compensating for differing patterns of nonresponse, and to improve precision by making school sample distributions conform to known population distributions.  The weight used for estimation is given by:

W            =              W1 * f1 * f2

W1       =                inverse of the probability of school selection.

f1          =                a nonresponse adjustment factor calculated by school size (large, medium, or small) and school level (senior high school, middle school, or junior/senior high school combined). 

f2          =                a poststratification adjustment factor calculated by type of locale (large central city, mid-size central city, urban fringe of large city, urban fringe of mid-size city, large town, small town, rural MSA, or rural non-MSA) and school level (senior high school, middle school, or junior/senior high school combined). 

Use Of The Results:

The weighted results can be used to describe school health policies and practices of all regular secondary public schools in Tennessee having at least one of grades 6 through 12.