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FutureStarrStem and Leaf Plot With Decimals
Stem Plots are fan out plots that can show trend lines and capture the data in a tidy way, as with the above left example. When the data is less accommodating, a "leaf" plot is also beneficial, like on the right:.
If I try to use the last digit, the hundredths digit, for these numbers, the stem-and-leaf plot will be enormously long, because these values are so spread out. (With the numbers' first three digits ranging from 232 to 270, I'd have thirty-nine leaves, most of which would be empty.) So instead of working with the given numbers, I'll round each of the numbers to the nearest tenth, and then use those new values for my plot. Rounding gives me the following list: Stem and leaf plots are a valuable way of organizing your data, and determining how many data points with a particular ones, tens, or hundreds digit you have. You can use stem and leaf plots to organize decimals much the same way that you would use stem and leaf plots to organize whole numbers. Since stem and leaf plots are not traditionally used to organize decimal numbers, you will need to create a key that makes it clear to your readers that you are organizing decimals.
The main advantage of a stem and leaf plot is that the data are grouped and all the original data are shown, too. In Example 3 on battery life in the Frequency distribution tables section, the table shows that two observations occurred in the interval from 360 to 369 minutes. However, the table does not tell you what those actual observations are. A stem and leaf plot would show that information. Without a stem and leaf plot, the two values (363 and 369) can only be found by searching through all the original data—a tedious task when you have lots of data!Be sure to read where R places the decimal point for the output. For this result, the decimal is placed 2 digits after the vertical bar. In other words, the decimal point is 1 digit after the leaf. Notice that the leaf is a single digit. That means, you need to add a 0 after each leaf. For example, the first entry has a stem of 0 and leaf of 4. That means that the shortest river is 40 miles. The next river has a stem of 2 and a leaf of 0. That means, it is 200 miles long. The third entry has a stem of 2 and a leaf of 1. That means, this river is 210 miles long. (Source: bookdown.org)