Regression analysis Flashcards
1
Q
What is the regression model concerned with?
A
Modelling the relationship between two or more variables
2
Q
How can the bivariate regression model be written?
A
Yi = α + βXi + ui
3
Q
In Yi = α + βXi + ui, X is:
A
The independent variable
4
Q
In Yi = α + βXi + ui, Y is:
A
The dependent variable
5
Q
In Yi = α + βXi + ui, u is:
A
A random error or disturbance
6
Q
In Yi = α + βXi + ui, Alpha and Beta are:
A
Parameters which characterise the relationship between Y and X
7
Q
What are two interpretations of the regression mode?
A
- The X values are chosen by the investigator e.g. by a process of experimentation
- The X and Y variables are jointly distributed random variables
8
Q
Generally, what are alpha and Beta?
A
Population parameters
9
Q
What are alpha (hat) and beta (hat)
A
Population parameters based on sample data
