Behavioural Surveillance Surveys - The Wisdom of Whores
Behavioural Surveillance Surveys - The Wisdom of Whores Behavioural Surveillance Surveys - The Wisdom of Whores
Instructions for using form 2 - Cluster Selection Sheet (Equal Probability) 1. Prepare a numbered list of sites or clusters, preferably ordered geographically (e.g., by areas of a city); 2. Calculate the sampling interval (SI) by dividing the total number of clusters in the domain (i.e., target group) (M) by the number of clusters to be selected (a) -- that is, SI = M/a; 3. Select a random number (RS) between 1 and (SI). The cluster on the numbered list corresponding to this number will be the first sample cluster; 4. Subsequent units are chosen by adding the sampling interval (SI) to the number identified in step (3); that is RS + SI, RS + 2SI, RS + 3SI, etc; 5. This procedure is followed until the list has been exhausted. Note : In selecting sample clusters, it is important that the decimal points in the sampling interval be retained. The rule to be followed is that when the decimal part of the sample selection number is less than 0.5, the lower numbered cluster is chosen, and when the decimal part of the sample selection number is 0.5 or greater, the higher numbered cluster is chosen. 340 A PPEN DI X 4 B EHAV I OR A L SURV EI L L A NC E S U R V EY S
Form 2 Cluster Selection Sheet (Equal Probability) Sub-Population ______________ Geographic Location ________________ Cluster Number Cluster Name Sample Selection Mark the Number Cluster Selected 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Total number of clusters : Planned number of sampled clusters : Sampling interval (Total number of clusters/Planned number of clusters) : Random Start (Random number between 1 and Sampling Interval) : Clusters Selected : B EHAV I OR A L S U R V EI L L A NC E SURV EY S APPEN DI X 4 341
- Page 297 and 298: An example of a question for which
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- Page 315 and 316: 3 APPENDIX WORKING EXAMPLES OF SAMP
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Form 2<br />
Cluster Selection Sheet (Equal Probability)<br />
Sub-Population ______________<br />
Geographic Location ________________<br />
Cluster Number Cluster Name Sample Selection Mark the<br />
Number<br />
Cluster Selected<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
10<br />
11<br />
12<br />
13<br />
14<br />
15<br />
16<br />
17<br />
18<br />
19<br />
20<br />
Total number <strong>of</strong> clusters :<br />
Planned number <strong>of</strong> sampled clusters :<br />
Sampling interval (Total number <strong>of</strong> clusters/Planned number <strong>of</strong> clusters) :<br />
Random Start (Random number between 1 and Sampling Interval) :<br />
Clusters Selected :<br />
B EHAV I OR A L S U R V EI L L A NC E SURV EY S APPEN DI X 4<br />
341
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