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Chap 14: correlation and regression - Coggle Diagram
Chap 14: correlation and regression
scatter plot
negative vs positive correlation
perfect correlation
Pearson correlation
use it because its predictable, validity, reliability, and theory verification
spearman correlation
can be monotonic
will potentially have tied ranks
point-biserial correlation is a special version
dichotomous variable or binomial variable: relationship between 2 variables
linear relationship
Sum of products
definitional formula
computational formula
need to consider outliers
outliers drastically alter the value for the correlation
restricted range
coefficient of determination is value of r (squared)
phi-coefficient
2 step procedure
linear relationship between X and Y
slope = b
y-intercept = a
regression
regression line
regression equation for Y:
analysis of regression
least-squared-error solution
standard error of estimate
