The F Awakens Flashcards
What is The General Model Equation?
A conceptual representation of all statistical models
outcome = model + error
What is The Linear Model Equation?
A particularly common type of statistical model
What does the error term include?
Everything that separates your model from actual reality (e.g. individual differences, unmeasured variables, measurement errors)
What is b0 in the linear model equation?
The value of y when x is 0 (intercept)
What is b1 in the linear model equation?
The change in y for every unit change in x (slope)
When we know b0 and b1, what can we estimate?
the outcome (y) for any value of x1
What is “The simplest model”?
The null (intercept-only) model where there is no relationship between the predictor(s) and outcome
If there is no relationship between the predictor and outcome, what does b1 =?
b1 = 0
What are three things a good model will do?
- Fit the data better than the simplest possible model
- Explain a lot of variance in the outcome
- Explain an amount of variance that significantly differs from zero
What does R^2 tell us?
The percentage of outcome variance our model explains
What does the F-statistic and its associated p-value tell us?
Whether the amount of variance explained is significantly different from 0
We can use the confidence interval as a measure of what?
Uncertainty
b1 is also an effect size that tells us the strength and direction of what?
The relationship between the predictor and the outcome
