The Influence of Third Variables in Hypothesis Testing
Delve into the significance of third variables and trivariate hypotheses in bivariate hypothesis testing through examples and theoretical concepts. Explore potential effects of third variables, including moderators, confounders, and intervening variables. Consider the impact of social class and metabolism on obesity, highlighting the complexity of relationships in research.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
THE EFFECT OF THIRD VARIABLES: THINKING ABOUT TRIVARIATE HYPOTHESES HENK VAN DER KOLK
AIM Theorizing about potential third variables. Introducing the word trivariate .
TESTING BIVARIATE HYPOTHESIS IS CHECKING: - - - time order of cause and effect correlation/association effect of third variables Theorizing about the effect of third variables Formulating a trivariate hypothesis Testing the trivariate hypothesis
EXAMPLE Explaining obesity Image of Gregory Mark Kovacs.jpg
EXAMPLE Does social class (income/education) have a negative effect on obesity of individuals? Social Class Obesity -
TESTING BIVARIATE HYPOTHESIS IS CHECKING: - - time order of cause and effect correlation/association
% of people with BMI > 25 100 80 60 40 20 0 low high Education Source: https://www.volksgezondheidenzorg.info
TESTING BIVARIATE HYPOTHESIS IS CHECKING: - - - time order of cause and effect correlation/association effect of third variables Theorizing about the effect of third variables Formulating a trivariate hypothesis Testing the trivariate hypothesis
Potential effects of third variables Moderator? Dependent variable Independent variable Confounder? Intervening variable? Another independent variable?
ADDITION: ANOTHER INDEPENDENT VARIABLE Social class Obesity + - Level of metabolism (genetics)
CONFOUNDING: A CONFOUNDING VARIABLE Social class Obesity _ - + Self constraint Ability to plan (genetic?)
INTERPRETATION: AN INTERVENING VARIABLE Social class Obesity - - + Knowledge about consequences
Confounding or interpretation? Time order: If the (original) independent variable precedes the third variable in time: interpretation. If the (original) independent variable is explained by the third variable: confounding.
INTERACTION: MODIFYING THE RELATIONSHIP Supply of easy food + Social class Obesity -
TRIVARIATE HYPOTHESIS After the introduction of the third (test) variable (mention the third variable) The bivariate relationship (mention the original bivariate hypothesis) (disappears, changes, remains the same) And the test variable is related to the other variables . (outline the model)
THE EFFECT OF THIRD VARIABLES: THINKING ABOUT TRIVARIATE HYPOTHESES
