Lecture 13 Use and Interpretation of Dummy Variables
[Pages:134]Lecture 13. Use and Interpretation of Dummy Variables
Stop worrying for 1 lecture and learn to appreciate the uses that "dummy variables" can be put to Using dummy variables to measure average differences Using dummy variables when more than 2 discrete categories Using dummy variables for policy analysis Using dummy variables to net out seasonality
Use and Interpretation of Dummy Variables
Dummy variables ? where the variable takes only one of two values ? are useful tools in econometrics, since often interested in variables that are qualitative rather than quantitative
Use and Interpretation of Dummy Variables
Dummy variables ? where the variable takes only one of two values ? are useful tools in econometrics, since often interested in variables that are qualitative rather than quantitative
In practice this means interested in variables that split the sample into two distinct groups in the following way
Use and Interpretation of Dummy Variables
Dummy variables ? where the variable takes only one of two values ? are useful tools in econometrics, since often interested in variables that are qualitative rather than quantitative
In practice this means interested in variables that split the sample into two distinct groups in the following way
D = 1
if the criterion is satisfied
Use and Interpretation of Dummy Variables
Dummy variables ? where the variable takes only one of two values ? are useful tools in econometrics, since often interested in variables that are qualitative rather than quantitative
In practice this means interested in variables that split the sample into two distinct groups in the following way
D = 1 D = 0
if the criterion is satisfied if not
Use and Interpretation of Dummy Variables
Dummy variables ? where the variable takes only one of two values ? are useful tools in econometrics, since often interested in variables that are qualitative rather than quantitative
In practice this means interested in variables that split the sample into two distinct groups in the following way
D = 1 D = 0
if the criterion is satisfied if not
Eg. Male/Female
Use and Interpretation of Dummy Variables
Dummy variables ? where the variable takes only one of two values ? are useful tools in econometrics, since often interested in variables that are qualitative rather than quantitative
In practice this means interested in variables that split the sample into two distinct groups in the following way
D = 1 D = 0
if the criterion is satisfied if not
Eg. Male/Female so that the dummy variable "Male" would be coded 1 if male
Use and Interpretation of Dummy Variables
Dummy variables ? where the variable takes only one of two values ? are useful tools in econometrics, since often interested in variables that are qualitative rather than quantitative
In practice this means interested in variables that split the sample into two distinct groups in the following way
D = 1 D = 0
if the criterion is satisfied if not
Eg. Male/Female so that the dummy variable "Male" would be coded 1 if male and 0 if female
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