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EBVM Animal Disease Surveys (Terminologies (Bias, Target population, Study…
EBVM Animal Disease Surveys
Information may be obtained from
Censuses
Sample surveys
National picture of disease
National and regional control and eradication campaigns
Local eradication and control campaigns
Terminologies
Bias
Target population
Study population
Elementary units
Stratum
Sampling frame
Sampling unit
Sampling fraction
Types of sampling
Non-probability
Convenience sampling
Purposive selection
Probability
SImple random sampling
Systematic sampling
Stratified sampling
Cluster sampling
Used when
Sampling frame is incomplete
Random sampling from all clusters I’m impracticable
May be
One stage: sample all animals in selected clusters
Two stage: sample some animals in selected clusters
Multistage
Sample size determination
Estimation of disease prevalence
Detecting the presence of disease
Terminologies
(P) : Expected proportion
(d) : precision of sample estimate
Degree of confidence in estimate
Population size
Formulae
Simple Random Sampling
Calculation of confidence intervals
Exact Method
Approximate Methods
Normal approximation
Poison approximation