The calculator above will graph and output a simple linear regression model for you, along with testing the relationship and the model equation. Keep in mind that Y is your dependent …

You can use statistical software such as Prism to calculate simple linear regression coefficients and graph the regression line it produces. For a quick simple linear regression analysis, try our …

Prism is purpose-built for scientists, and when it comes to nonlinear regression, Prism is the industry favorite tool. With a consistently clear, practical, and well-documented interface, Prism …

The standard dose-response curve is sometimes called the four-parameter logistic equation. It fits four parameters: the bottom and top plateaus of the curve, the EC50 (or IC50), and the slope …

Switch to the Interpolated X values subpage of the Results sheet to view the “unknown” values computed on the basis of the linear regression. Prism reports the corresponding X value for …

The nonlinear regression analysis fits the data, not the graph. Since Prism lets you choose logarithmic axes, some graphs with data points that form a straight line follow nonlinear …

Prism offers built-in equations designed to handle X values as either concentration OR log (concentration). Be sure you select the correct equation when performing nonlinear regression!

Free web calculator provided by GraphPad Software. Calculates the P value from z, t, r, F, or chi-square.

Prism offers two forms of simple regression: simple linear regression and simple logistic regression. Although these analyses are related, we discuss them separately.

Prism does not automatically write equations on the graph. You can see the numerical results of linear or nonlinear regression by going to the appropriate page in the Results folder.