Karteikarten
ger sampling
Karten in diesem Stapel (18)
- 1unitidentify element from which measurements are to be taken
- 2populationall the units
- 3Sample subsetPortion of the population
- 4Census vs sampleCensus may not be possible
Speed
Cost
Accuracy-better task force - 5What is good sampleEvery unit in the population has a possibility of being selected
Selection process is not bias - 6Steps for good samplingSampling frame-well represented,good coverage, every person in population must have a probability of being selected
up to date and complete - 7Simple random samplingAssign number 1 to N in sampling frame, where n is number of sampling unit
Use function randbetween (1,N) in excel to generate random numbers.
Sampling unit is selected - 8Systematic samplingInterval of K unit
We can use if the number of sampling units is unknown - 9Characteristic of systematicbad if there is a cyclical effect
- 10Stratified samplingDivide the population into groups and then take probability sample from each group
More accurate result of the overall effectiveness throughout the country - 11Multi-stage samplingEg Cluster sampling, each unit is interviewed
And then interview one of them - 12Unwanted units excludedImperfect sampling frame-certain times it exclude those unwanted units
We need to 1)redefine target population
2)assess the impact of excluding these units - 13Non-responseNot all are contactable
Not all are willing to take part - 14Volunteer or self-selected sampleStrong view of the issue are interviewed. It is biased.
- 15Convenient or haphazard samplereadily available
- 16Judgmental samplebias, as interviewee are selected by interviewers using their own discretion about who is representative
- 17Quota samplenumbered under each category, but there would still be a tendency to interview their preferred unit ( etc gender under race )
- 18—
Informationen
- Beschreibung
- Ger1000 Karteikarten am ger sampling, erstellt von liu haoyu am 17/09/2017.
- Erstellt von
- liu haoyu
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