Week 6 Flashcards
What is the General Linear Model?
Statistical framework showing relationship between 1 dependent variable and multiple independent variables, assuming a linear relationship and that the residuals will be normally distributed
What is the purpose of the General linear model?
Assess the strengths and directions of relationships and differences
Assess the strengths, interventions and manipulations
Analyse and Predict relationships between DV and IVs allowing for hypothesis testing and understaning patterns
What is ANOVA
Analysis of Variance
All GLM tests analyse variance but ANOVAs are for categorical differences such as different conditions and groups in a study , it looks at the mean differences to see if they are statistcially significant
One way ANOVA? Example?
Comapres means of 3 or more groups with1 IV and one continuous outcome(DV)
Which of the 3 diets leads to better weight loss
Factorial (Multi-way) ANOVA? Example?
Two or more groups; two or more categorical predictor variables(IVs) and one outcome variable(DV, what the measure is)
Which teaching method (traditional or online) and study time (short or long) causes better test scores.
Repeated measures (within-subjects) ANOVA? Example?
One group; two or more categorical predictor variables (IVs), one outcome variable (DV, what is measured)
Measuring effect of medication on blood pressure, before taking, 1 month after and 3 months after.
Mixed ANOVA? Example?
Two or more groups; one or more categorical predictor variables(IV)(can be both repeated/within subjects and between subjects -2 levels), one outcome variable (DV, what is measured)
Study how therapy type (cognitive/behavioral) and time (before, after 1 month therapy, after 3 months therapy) affects anxiety levels
ANOVA (t-test)? Example?
2 groups, One categorical predictor(IV) , one continuous outcome (DV)
T-test is 2 groups, ANOVA is 3 or more
Comapring test scores between group A and B
What are assumptions in (Repeated measures)ANOVA
Observations are independent (different people, times etc)
Variance of different groups or conditions should be equal
Residuals will be normally distributed
Difference between levels of a variable should have equal variance
What is MANOVA? Example?
Multivariate analysis of data
Used to determine difference/relationship in multiple outcome variables (DVs) across groups with one ore or more categorical independent variables
(ANOVA only tests 1 DV)
Does students, math, english and science score differ based on their study method of self study, group study etc?
What is logistics regression? Example?
Statistical method to determine discrete outcome variables (yes or no) based on one or more IVs
Can we predict whether someone will buy a product based off of their age and income
What is a Post-hoc test?
Used in One-way ANOVA after finding significant difference between 3 or more groups/conditions and is used to see which were significantly different from each other
What is an interaction in ANOVA results?
An interaction between 2 variables is when the differences in one variable are affected by the differences in another variable
What is ANCOVA? Example?
Combines ANOVA and Regression, tests for significant differences in a single dependent variable across groups while controlling effect of one or more continuous variables
Does type of exercise ( aerobic/strength) affect weight loss (DV) after controlling(accounting for) participants age?
What is multivariate regression? example?
Multivariate Regression is a statistical technique used to predict or understand the relationship between two or more dependent variables (outcomes) and one or more independent variables (predictors)
Different to multiple as multiple is only 1 DV
How do study hours and teaching style affect students’ performance in math and reading?
