25 Recipes for Getting Started with R by Paul Teetor

By Paul Teetor

R is a robust instrument for statistics and images, yet getting begun with this language should be troublesome. This brief, concise publication offers newcomers with a variety of how-to recipes to resolve basic issues of R. each one answer supplies simply what you want to understand to exploit R for uncomplicated facts, pictures, and regression.

You'll locate recipes on analyzing facts records, developing information frames, computing uncomplicated information, checking out capacity and correlations, making a scatter plot, acting easy linear regression, and plenty of extra. those ideas have been chosen from O'Reilly's R Cookbook, which incorporates greater than two hundred recipes for R that you'll locate helpful when you movement past the basics.

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Extra resources for 25 Recipes for Getting Started with R

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First, we compute the means: > heights <- tapply(airquality$Temp, airquality$Month, mean) That gives the heights of the bars, from which we create the bar chart: > barplot(heights) The result is shown in the lefthand panel of Figure 1-4. The result is pretty bland, as you can see, so it’s common to add some simple adornments: a title, labels for the bars, and a label for the y-axis: > barplot(heights, + main="Mean Temp. arg=c("May", "Jun", "Jul", "Aug", "Sep"), + ylab="Temp (deg. F)") 80 60 40 20 0 0 20 40 Temp (deg.

Packages function. 24 Predicting New Values Problem You want to predict new values from your regression model. Solution Save the predictor data in a data frame. 5) > predict(m, newdata=preds) Discussion Once you have a linear model, making predictions is quite easy because the predict function does all the heavy lifting. The only annoyance is arranging for a data frame to contain your data. The predict function returns a vector of predicted values with one prediction for every row in the data. 99569 In case it’s not obvious, the new data needn’t contain values for response variables, only predictor variables.

Solution Use either the library function or the require function to load the package into R: > library(packagename) Discussion R comes with several standard packages, but not all of them are automatically loaded when you start R. Likewise, you can download and install many useful packages from CRAN, but they are not automatically loaded when you run R. The MASS package comes standard with R, for example, but you could get this message when using the lda function in that package: > lda(x) Error: could not find function "lda" R is complaining that it cannot find the lda function among the packages currently loaded into memory.

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