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8-sampling-strategy [2018/08/01 16:13] thorsten [8.2 Sampling at the secondary sampling unit (SSU) level] |
8-sampling-strategy [2018/08/01 16:13] thorsten [8.1 Sampling at the primary sampling unit (PSU) level] |
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| ===== 8.1 Sampling at the primary sampling unit (PSU) level ===== | ===== 8.1 Sampling at the primary sampling unit (PSU) level ===== | ||
| The information needed to be collected are:\\ A) Number of PSU in the population (which should have been determined in [[/7-Study-design|section 7]])\\ B) Design prevalence\\ C) Desired confidence\\ D) Desired power\\ E) Sensitivity (Sensitivity at the PSU level equals confidence at the SSU level, if two-stage sampling is used)\\ F) Specificity\\ \\ This information will be used in later steps for sample size calculation. In some cases, the sample size is decided a priori, for instance based on a specific budget. If this is the case, then the information in this section would not need to be collected. Then, in step 8.5 (below) you will find a link to tools to explore different sampling options and carry out a power analysis - identify the achievable confidence using the sample size established a priori.\\ \\ | The information needed to be collected are:\\ A) Number of PSU in the population (which should have been determined in [[/7-Study-design|section 7]])\\ B) Design prevalence\\ C) Desired confidence\\ D) Desired power\\ E) Sensitivity (Sensitivity at the PSU level equals confidence at the SSU level, if two-stage sampling is used)\\ F) Specificity\\ \\ This information will be used in later steps for sample size calculation. In some cases, the sample size is decided a priori, for instance based on a specific budget. If this is the case, then the information in this section would not need to be collected. Then, in step 8.5 (below) you will find a link to tools to explore different sampling options and carry out a power analysis - identify the achievable confidence using the sample size established a priori.\\ \\ | ||
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| ===== 8.2 Sampling at the secondary sampling unit (SSU) level ===== | ===== 8.2 Sampling at the secondary sampling unit (SSU) level ===== | ||
| If one-stage sampling process is applied, then PSU is the only unit to consider (skip this step). For two-stage sampling, the same information should be collected for the SSU level:\\ A) Number of SSUs in the population (which should have been determined in [[/7-Study-design|section 7]])\\ B) Design prevalence\\ C) Desired confidence\\ D) Desired power\\ E) Sensitivity\\ F) Specificity\\ \\ | If one-stage sampling process is applied, then PSU is the only unit to consider (skip this step). For two-stage sampling, the same information should be collected for the SSU level:\\ A) Number of SSUs in the population (which should have been determined in [[/7-Study-design|section 7]])\\ B) Design prevalence\\ C) Desired confidence\\ D) Desired power\\ E) Sensitivity\\ F) Specificity\\ \\ | ||