Terms : Hide Images
| 1621845922 | Representative Sample | characteristics of interest can be estimated from the sample with a known degree of accuracy | 0 | |
| 1621845923 | Observation unit | An object on which a measurement is taken | 1 | |
| 1621845924 | Target Population | Complete collection of observations we want to study | 2 | |
| 1621845925 | Sample | Subset of a population | 3 | |
| 1621845926 | Sampled Population | The collection of all possible observation units that might have been chosen in a sample; the population from which the sample was taken. | 4 | |
| 1621845927 | Sampling Unit | A unit that can be selected fro a sample. [ex. We want to sample individuals but can't. We instead sample households and survey individuals. Sampling units are the households and observation units are the individuals] | 5 | |
| 1621845928 | Sampling frame | A list, map or other specification of sampling units in the population from which a sample may be selected | 6 | |
| 1623187559 | Selection bias | occurs when some part of the target population is not in the sampled population, or more, generally, when some population units are sampled at a different rate than intended | 7 | |
| 1623187560 | Sample of convenience | often biased; units that are easiest to select or are most likely to respond are usually not representative of the harder-to-select or non-responding units | 8 | |
| 1623187561 | judgement sample | investigator chooses his or her judgement to select the specific units to be included in the sample | 9 | |
| 1623187562 | under-coverage | failing to include the target population in the sampling frame | 10 | |
| 1623187563 | overcoverage | including population units in the sampling frame that are not in the target population | 11 | |
| 1623187564 | nonresponse | failing to obtain responses from all of the chosen sample | 12 | |
| 1623187565 | measurement error | when the response in a survey differs from the true value | 13 | |
| 1623187566 | measurement bias | occurs when the response has a tendency to differ from the true value in one direction | 14 | |
| 1623187567 | sampling error | error that results from taking one sample instead of examining the whole population | 15 | |
| 1623187568 | non-sampling errors | any errors that cannot be attributed to the sample-to-sample variability (selection bias and measurement error) | 16 |
