In R, the function harvtest(formula, order.by = NULL, data = list()) is used to execute the test. Key Components and Usage
The test is used to determine if the relationship between variables in a linear regression model is truly linear or if it is instead convex or concave. HARVTEST V1.4
It performs a t-test on recursive residuals. If the relationship is non-linear, the mean of these residuals will differ significantly from zero. Hypothesis: Null Hypothesis ( H0cap H sub 0 ): The true relationship is linear. Alternative Hypothesis ( H1cap H sub 1 ): The relationship is non-linear (convex or concave). In R, the function harvtest(formula, order
