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# Lecture9 - ECO 220Y Lecture 9 Data Collection and Research...

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ECO 220Y Lecture 9 Data Collection and Research Question Migiwa Tanaka Chapter 5, Chapter1 of Stock & Watson 1

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O tli Outline Research Questions Sampling Sampling Error and Non-Sampling Error Types of Data by collection method Endogeneity Bias 2
R h Q ti Research Questions Research Questions: asking causal relationship among variables, in the context of Quantitative Methods (Econometrics) (Econometrics). X: Independent Variable, Explanatory Variable Y D d V i bl E l i d V i bl Y: Dependent Variable, Explained Variable Example: Does a decrease of class size improve elementary education? Y: quality of education X: Class size 3

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S li Sampling Population & Sample Usually very costly to get population data. I t d d t t t f l ti l Instead, need to get part of population, a sample. What kinds of approach are there to collect the data for analysis? What should we be careful about for each approach? 4
S li & N S li E Sampling & Non-Sampling Errors Sampling Error (Sampling Noise White Noise) Sampling Error (Sampling Noise, White Noise) Discrepancy between population and sample because sample is random but only a part of population random but only a part of population. Remedy: By increasing the sample size, we can reduce the chance of having big sampling error chance of having big sampling error.

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Lecture9 - ECO 220Y Lecture 9 Data Collection and Research...

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