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IV. Preliminary Versus Final Estimates

Estimates presented in this report are considered preliminary because they are based on the initial weighting, editing, and imputation procedures implemented immediately after data collection was completed (December 1995). Further analyses of the 1995 NHSDA data and evaluation of the estimation procedures is ongoing, and may result in revisions in later data releases. However, if no such revisions are deemed necessary, final estimates will be the same as the preliminary estimates presented in this report. Final estimates will be published in Population Estimates, which will be available in mid-1996 and in Main Findings, which will be published in 1997. SAMHSA will also release additional analyses from the 1995 NHSDA through additional published reports and journal articles.

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