23 C.F.R. § 1340.5   Documentation requirements.


Title 23 - Highways


Title 23: Highways
PART 1340—UNIFORM CRITERIA FOR STATE OBSERVATIONAL SURVEYS OF SEAT BELT USE

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§ 1340.5   Documentation requirements.

All sample design, data collection, and estimation procedures used in State surveys conducted in accordance with this part must be well documented. At a minimum, the documentation must:

(a) For sample design—

(1) Define all sampling units, with their measures of size;

(2) Define what stratification was used at each stage of sampling and what methods were used for allocation of the sample units to the strata;

(3) Explain how the sample size at each stage was determined;

(4) List all samples units and their probabilities of selection; and

(5) Describe how observation sites were assigned to observation time periods.

(b) For data collection—

(1) Define an observation period;

(2) Define an observation site and what procedures were implemented when the observation site was not accessible on the date assigned;

(3) Describe what vehicles were observed and what procedures were implemented when traffic was too heavy to observe all vehicles; and

(4) Describe the data recording procedures.

(c) For estimation—

(1) Display the raw data and the weighted estimates;

(2) For each estimate, provide an estimate of one standard error and an approximate 95 percent confidence interval; and

(3) Describe how estimates were calculated and how variances were calculated.

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