2 Regression http://n-steps. tetratech-ffx One of the most common statistical modeling tools used, regression is a technique that treats one variable as a function of another.The result of a regression analysis is an equation that can be used to predict a response from the value of a given predictor.Regression is often used in experimental tests where … one tests whether there is a significant increase or decrease in the response variable ….
3 What’s that mean?One tool used in the ‘real world’ to help make business decisions and determine the results of scientific experiments is regression analysis.You use regression analysis to see if one thing (like the periods of time a store is open) strongly affects another thing (like how much money the store makes).There are many types of regression analysis.Two of those are linear and nonlinear.
4 Linear Regressionline of best fitscatterplotThe relationship between the two variables is directly proportional.Directly Proportional: If one value increases, the other increases as well.The function that passes through the middle of the scatterplot is called the line of best fit.Linear Regression Model
5 Nonlinear Regressions There are many types of nonlinear regressions due to the fact that they are anything that is not linear.Quadratic RegressionCubic RegressionQuartic RegressionPower RegressionExponential RegressionLogarithmic RegressionLogistic Regression
10 Calculating a Regression Function XY5119.9430424.7210166.6535591.1515213.3240757.9620256.0145963.3625406.4450Step One: Press STATStep Two: Select EDITStep Three: Enter the data
11 Calculating a Regression Function Step Four: Press STAT PLOTStep Five: Select 1Step Six: Select ON
12 Calculating a Regression Function Step Seven: Press WINDOWStep Eight: Adjust x-min, x-max, y-min, and y-maxStep Nine: Press GRAPH
13 Calculating a Regression Function Step Ten: Press STATStep Eleven: Select CALCStep Twelve: Select4: LinReg(ax+b)[we’re going to see if it’slinear]Step Thirteen: Tell the Calculator where you want the equation stored.