05/20/04
PSYC2009 Lecture 23
1
PSYC2009 LECTURE 23:
Introduction to Linear Regression
Relevant textbook chapter: Smithson, Ch.8, pp. 252-262.
When prediction is the main goal of a study, researchers often turn to
a regression analysis. A regression model
05/21/03
PSYC2009 Lecture 24
1
PSYC2009 LECTURE 25:
Predictive Accuracy and Correlation
Relevant textbook chapter: Smithson, Ch.8, pp. 269-276.
Confidence interval for the regression coefficient
Because SSe measures the amount of variation in Y away from
06/02/03
PSYC2009 Lecture 26
1
PSYC2009 LECTURE 26:
Correlation, Causation, and the General Linear Model
Relevant textbook chapter: Smithson, Ch.8, pp. 283-289.
Correlation and causation
Most often, researchers are interested in relationships between two
04/29/03
PSYC2009 Quantitative Methods Lec. 22
1
PSYC2009 Lecture 22:
Effect-Size in Analysis of Variance
Relevant textbook chapter: Smithson, Ch.7, pp. 241-249
1. How big is the effect?
Even when ANOVA tells us there is a significant difference
among tre
05/25/09
PSYC2009 Lecture 24
1
PSYC2009 LECTURE 24:
Evaluating Linear Regression Models
Relevant textbook chapter: Smithson, Ch.8, pp. 222-269.
Evaluating Regression Models with R2
Evaluating how well a regression model predicts the dependent
variable rai
04/29/03
PSYC2009 Quantitative Methods Lec. 21
1
PSYC2009 Lecture 21:
Analysis of Variance (ANOVA)
Relevant textbook chapter: Smithson, Ch.7, pp. 234-241
Rationale for ANOVA
We have already seen the need to compare means for more than two
groups in an exp
10-02-03
PSYC2009 LEC 17
1
PSYC2009 Lecture 17:
Effect Size and Power
Relevant textbook chapter: Smithson, Ch. 6, pp. 198-208
In the most recent lectures we have learned about the t-test and how
Type I and Type II errors, confidence levels, and power are
5/05/2010
PSYC2009 Quantitative Methods Lec. 18
1
PSYC2009 Lecture 18:
Comparing Two Means
Relevant textbook chapter: Smithson, Ch.7, pp. 211-223.
Basis of the comparison
The key to understanding statistical inference in between-subjects
experiments is ra
07-02-03
PSYC2009 LEC 15
1
PSYC2009 Lecture 15:
Type I and Type II Error
Relevant textbook chapter: Smithson, Ch. 6, pp. 185-192
Last time we learned about the procedure for a significance test:
1. Decide on the confidence level that you wish to use for
d
12/05/2010
PSYC2009 Quantitative Methods Lec. 20
1
PSYC2009 Lecture 20:
Comparing Two Variances
Relevant textbook chapter: Smithson, Ch.7, pp. 230-234
Variances from Two Independent Samples
Recall that means aren't the only thing we can compare between
ex
08-02-03
PSYC2009 LEC 16
1
PSYC2009 Lecture 16:
Confidence Intervals and the t-test
Relevant textbook chapter: Smithson, Ch. 6, pp. 192-198
In the most recent lectures we have learned how to use a confidence
interval to perform a significance test, and ho
3/05/2007
PSYC2009 Quantitative Methods Lec. 19
1
PSYC2009 Lecture 19:
Comparing More Than Two Means
Relevant textbook chapter: Smithson, Ch.7, pp. 223-230
Problem of multiple confidence intervals
In many situations we may want to compare means from more
3/31/2004
PSYC2009 Quantitative Methods Lec. 13
1
PSYC2009 Lecture 13:
Introduction to Confidence Intervals
Relevant textbook chapter: Smithson, Ch. 5, pp. 148-162, 169-172
Last lecture, we introduced the idea of a sampling distribution and
saw how it pro
31-03-11
PSYC2009 LEC 14
1
PSYC2009 Lecture 14:
Statistical Models and Significance Testing
Relevant textbook chapter: Smithson, Ch. 6, pp. 175-185
Confidence intervals convey how precise our estimates are. But we
can also use them to make inferences abou
2/13/2012
PSYC2009 Quantitative Methods Lec. 4
1
PSYC2009 LECTURE 4:
Using Graphs to D escribe Variables
Reading: Ch. 3, 52-72
Last week, we covered basic ideas about variables and measurement.
Now we're going to examine techniques for describing and
summ
1/03/2012
PSYC2009 Quantitative Methods Lec. 6.5
1
PSYC2009 LECTURE 6.5:
D escriptive Statistics and Measurement
Reading: None
Overview of descriptive stats so far
Thus far, weve introduced methods of summarizing data via the
following methods:
1. Tables
3/27/2008
PSYC2009 Quantitative Methods Lec. 12
1
PSYC2009 Lecture 12:
The Normal Distribution and Sampling Distributions
Relevant textbook chapter: Smithson, Ch. 4, pp. 122-127, Ch. 5, pp.
131-135
Last lecture, we used probability to introduce the concep
02/05/03
PSYC2009 Quantitative Methods Lec. 11
1
PSYC2009 Lecture 11:
Introduction to Distributions: Binomial Distribution
Relevant textbook chapter: Smithson, Ch. 4, 116-122
Probability distributions.
A probability distribution presents the categories of
3/26/2003
PSYC2009 Quantitative Methods Lec.9
1
PSYC2009 LECTURE 9:
Probabilities of Compound Events
Relevant textbook chapter: Smithson, Ch. 4, pp. 106-112
Why do we need to know about probability?
1. Anything random involves probabilities.
Inferential s
29/02/2012
PSYC2009 Quantitative Methods Lec.5
1
PY2009 LECTURE 5-6:
Summarizing D istributions and More Lies
Reading: Ch.3, 72-83
Measures of central tendency
Measures of central tendency are ways of describing a "typical" case
in the data.
Frequency
The
3/15/2012
PSYC2009 Quantitative Methods Lec.10
1
PSYC2009 LECTURE 10:
Conditional Probabilities and Risk
Relevant textbook chapter: Smithson, Ch. 4, pp. 112-116
Health psychologists and epidemiologists refer to a characteristic (be
it age, gender, whether
2/11/2003
PSYC2009 Quantitative Methods Lec. 8
1
PSYC2009 Lecture 8:
Experimental Design and Statistical Inference
Relevant textbook chapter: Smithson, Ch. 4, 103-106
Last lecture we briefly examined the concept of an experiment with
randomized assignment
3/7/2012
PSYC2009 Quantitative Methods Lec. 7
1
PSYC2009 Lecture 7:
Introduction To Inferential Statistics
Relevant textbook chapter: Smithson, Ch. 4, 87-102
Motives for using inferential statistics:
Sampling
Suppose you wanted to find out the percentage
22-02-12
PSYC2009 Lec. 2
1
PSYC20009 LECTURE 2
Measurement, Variables and D ata
Reading: Ch. 2, 26-49.
Basic concepts
A construct is a concept, usually a characteristic or property, that
underlies measurement.
A construct is an indicator of another cons
22-02-07
PSYC2009 Lec.3
1
PSYC2009 LECTURE 3:
Introduction to Survey and Interview Questions
1. Overview of surveys and interviewing principles
(a) Interviews and surveys should approximate a conversation without
degenerating into a 'nice chat'.
(1) They
21-02-07
PSYC2009 Lec.1
1
PSYC2009 LECTURE 1:
Uncertainty and psychological research
Reading: Ch.1, 5-24
Why do we need to learn about this stuff?
Why do we need measurement?
Asking people questions or interviewing them is "measurement."
Observing peopl