For example, we could turn the curve into a red dashed line: library(ggplot2) #plot logistic regression curve Note that this is the exact same curve produced in the previous example using base R.įeel free to modify the style of the curve as well. Stat_smooth(method=" glm", se=FALSE, method.
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The following code shows how to fit the same logistic regression model and how to plot the logistic regression curve using the data visualization library ggplot2: library(ggplot2) #plot logistic regression curve To create this plot in SAS, you can do the following: Use PROC LOGISTIC to output the predicted probabilities for any logistic regression. specifies the level of significance for confidence intervals. The fringe plot reveals that about 77 of the observed responses are Y0, a fact that was not apparent in the original plots that used a scatter plot to visualize the response variable. Table 51.1 summarizes the available options. Example: Plot a Logistic Regression Curve in ggplot2 The PROC LOGISTIC statement invokes the LOGISTIC procedure and optionally identifies input and output data sets, suppresses the display of results, and controls the ordering of the response levels. We can clearly see that higher values of the predictor variable hp are associated with lower probabilities of the response variable vs being equal to 1.
The x-axis displays the values of the predictor variable hp and the y-axis displays the predicted probability of the response variable am. Plot(vs ~ hp, data=mtcars, col=" steelblue") Newdata$vs = predict(model, newdata, type=" response") #use fitted model to predict values of vs frame(hp=seq(min(mtcars$hp), max(mtcars$hp),len= 500)) #define new data frame that contains predictor variable Model <- glm(vs ~ hp, data=mtcars, family=binomial) The following code shows how to fit a logistic regression model using variables from the built-in mtcars dataset in R and then how to plot the logistic regression curve: #fit logistic regression model Example: Plot a Logistic Regression Curve in Base R Often you may be interested in plotting the curve of a fitted logistic regression model in R.įortunately this is fairly easy to do and this tutorial explains how to do so in both base R and ggplot2.
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