Data Collection
In Statistics, there is
- a research question about the target population
- and we need to answer it based on some data
- how to get the data?
- Typically cannot get the data for the entire population
- Can take a fraction of this data - this is called Sampling
Types
There are several types of data collection:
- Observational Studies - monitor and record
- sufficient to show association
- not sufficient to show causation
- Statistical Experiments - conduct an experiment and collect the data
- sufficient to show causation when the experiment is designed carefully
Sources