Chapter3 - Introduction Producing Data Statistics is...

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1 Producing Data Introduction • Statistics is concerned with interpreting already available data as well as producing new data. • This chapter will help you understand: – Very basic principles of getting trustworthy data. – Develop a critical view of whether existing data are trustworthy or flawed. Data sources • Limitation of anecdotal evidence. • Available data: from the library and the internet. (e.g. Statistics Canada: ) • Producing data – Sampling: Section 3.3 sampling design – Experiments Section 3.2 experiment design Introduction: observational study vs. experiment Observational study : observes individuals and measures variables of interest. Subjects (usually people) are not asked to do anything other than to respond truthfully to questions. Experiment : deliberately imposes some treatment on individuals in order to observe their responses.
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2 Observational study or sampling • Used more frequently in the social sciences • examples include opinion polls, labour market activity surveys. • Usually, not everyone is in a sample. • A census includes each individual in the population. Such large samples are very expensive. Canada conducts a census every five years. • Limitation of observational studies: example 1 3.1 Experiments • Used more frequently in sciences and social experiment is less common. • Designing and actually conducting the
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This note was uploaded on 09/01/2011 for the course ECON 2500 taught by Professor Xianghongli during the Fall '11 term at York University.

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Chapter3 - Introduction Producing Data Statistics is...

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