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    Question

    Which of the following R functions is most appropriate

    for fitting a linear regression model?
    A plot() Correct Answer Incorrect Answer
    B lm() Correct Answer Incorrect Answer
    C summary() Correct Answer Incorrect Answer
    D predict() Correct Answer Incorrect Answer
    E cor() Correct Answer Incorrect Answer

    Solution

    Explanation: The lm() function in R is specifically designed for fitting linear models, including linear regression. This function takes the formula for the dependent and independent variables, along with the dataset, and returns an object containing all the necessary information about the fitted model. For example, using lm(y ~ x, data=dataset) fits a linear regression model to predict y based on x . This makes it an essential tool for statistical modeling and predictive analytics. The lm() function forms the backbone for many analyses in R, enabling data analysts to understand relationships between variables and build models for forecasting or hypothesis testing. Option A: The plot() function creates visualizations but does not perform statistical modeling. Option C: The summary() function provides details about a fitted model, but it doesn’t fit models itself. Option D: The predict() function makes predictions based on a model fitted by lm() but does not perform fitting. Option E: The cor() function calculates correlation between variables, which is useful for analysis but not for fitting models.

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