trends, trendlines, regression, regression analysis, cross-section data, scatter chart, plotting, R2, R-Squared, regression line, polynomials, best fit, stepwise regression, intercept, slope, Multiple R, R-Square Adjusted R Square, Standard Error, parameters, parameter estimation, interpreting sample parameters, interpreting significance of regression, confidence intervals, regression assumptions, normality of errors, homoscedasticity, heteroscedasticity, autocorrelation, outliers,