Measuring the goodness of fit
Explained variations and unexplained variations (residuals)
How much of the variation in Y is explained by this regression line? If you have perfect correlation then it would be 1. But usually in social science research we d
Multiple Regression
Coefficient of Multiple
Determination, R2
The proportion of the variation in the
dependent variable that is explained by the
several explanatory variables.
Lies between 0 and 1. The higher it is the
more the variation in Y that has b
Study Guide I
SOCI 377B
Walther
Basic mathematical equations.
1. How is a line defined?
2. What does Y equal? Why is this significant? Be able to explain how Y and X work
together.
Y
X
5
7
9
a
1
0
2
b
4
6
8
Wheel of Science
3. How does this class define c
Study Guide 377B Spring, 2010 Wheel of Science 1. How does this class define conceptualization and operationalization? How do they work for theories, questions, and measurements?
2. What is the wheel of science?
3. What is an inquiry? What are the four wa
Why learn about research methods?
Necessary to understand scholarly/research articles Crucial to performing your own research Develops your analytical and critical thinking skills
Overview of Course
Unit 1: Understanding basic concepts of how research i
Reliability
Cohens Kappa
K=
Cohens Kappa
Or, equivalently, using frequencies from a
cross-classification table:
K=
Where dobs and dexp are number of
disagreements that are observed and
expected by chance, respectively.
Calculating Kappa
Rater 2
Rater 1
Ye
Reliability analysis allows you to study the properties of measurement scales and the items that compose the scales. The Reliability Analysis procedure calculates a number of commonly used measures of scale reliability and also provides information about
Simple linear regression
Explanatory and dependent
variables
X having the influence on Y.
or Y = f(X).
More than one independent variable.
Questions addressed by regression
1. Is there any relationship or association between
X and Y?
2. If so, how stro