rmda exam 3 chapter 9

b (beta)

slope

a

intercept

regression equation

y=bx+a

homogeneity/homoscedastic

all close to the regression line

herterogeneity/heteroscedastic

spread further apart from regression line

residuals

devations around regresssion line

intercept definition

where the line crosses y-axis

slope defintion

for every 1 unit increase in X, there is a change in Y

covariates

potential third variables

std coeff

beta value in z score units to make it comparable to all predictor variables

coeff

the beta value in units of the variables

regression line

lets us predict Y scores from X scores

RMSE

devation away from regression line

measure of average prediction error

standard deviation

devation away from mean

R^2

describes how much variability X can explain

interpretation of predicting values of Y given X

using a regression line to estimate the average value of Y for a given value of X

covariance

do the results show that the variables are correlated

temporal precedence (directionality problem)

does the method establish which variable came first

cross sectional correlations

the correlation of variables when measured at the same time

external validity

the degree to which a claim generalizes to a larger population

direct replication

same concepts and variables, same operational defintions

conceptual replication

same concepts, differnt operational defintions

replication+extension

same concepts and variables, plus some new concepts and variables

theory

statement or set of statements that describes general principles about how variables relate to one another

hypothesis/prediction

what you expect to happen

systematic review

collect, evaluate, and synthesise all availiable studies on a specific question

meta analysis

combining results of several similar studies to estimate effect size

standardized beta coefficient

a measure of the strength and direction of a relationship between 2 variables

beta

raw coefficient (slope) from the model

theory testing mode

internal validity

generalization mode

external validity