DataCamp

Building simple logistic regression models

The donors dataset contains 93,462 examples of people mailed in a fundraising solicitation for paralyzed military veterans. The donated column is 1 if the person made a donation in response to the mailing and 0 otherwise. This binary outcome will be the dependent variable for the logistic regression model.

The remaining columns are features of the prospective donors that may influence their donation behavior. These are the model's independent variables.

When building a regression model, it it often helpful to form a hypothesis about which independent variables will be predictive of the dependent variable. The bad_address column, which is set to 1 for an invalid mailing address and 0 otherwise, seems like it might reduce the chances of a donation. Similarly, one might suspect that religious interest (interest_religion) and interest in veterans affairs (interest_veterans) would be associated with greater charitable giving.

In this exercise, you will use these three factors to create a simple model of donation behavior.

The dataset donors is available in your workspace.

Examine donors using the str() function.
Count the number of occurrences of each level of the donated variable using the table() function.
Fit a logistic regression model using the formula interface and the three independent variables described above.
- Call glm() with the formula as its first argument and the dataframe as the data argument.
- Save the result as donation_model.
Summarize the model object with summary().

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Exercise

Building simple logistic regression models

Instructions