ECO 2117 Lecture Notes - Lecture 3: Internal Validity, Hawthorne Effect, External Validity

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A dependent variable depends on another variable whereas an independent variable is used to explain variation in the dependent variable. In the case of wealth/gdp with democracy --> democracy would be the independent variable because we are looking for how democracy brings growth. We would come up with an index of democracy (x-axis), and a growth index or maybe the gdp per capita (y-axis) and then we have data from the wb or somewhere else. We would have a graph with all kinds of data points from different countries on the graph. We want to see if there is a negative or positive correlation between the two. In this case the correlation would be positive because the slope is positive. There is a positive correlation between democracy and growth. A negative example: corruption (0-100) and gdp per capita. There is a negative relationship between those data points.

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