Getting Started, Loading Data
I called my data data1 I might first be curious about basic descriptive & summary statistics about your data. By typing str(data1), you can see that the R object "data1", has three variables; section, class & final. (This happens to be data of student section attendance, lecture attendance and final exam scores for a class at Michigan State University.) Simple Histogram Let's create a histogram for their final exam grades:
We get the following histogram: Notice that there are only 9 bins to form the histogram above. Since the maximum score was 166 points. let's set 166 bins so we have a vertical line for each possible exam score. Adding More Bins (Adding more detail to a histogram)
Well, it doesn't look great (I think my screen resolution was just really bad as I took the screen shot), but has a bit more information in it. Adding Labels to a Histogram in R Now, let's add some useful labels:
