# Box plots in stata forex

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The following statement provides an example. In a similar way you can overlay markers that represent special observations or reference values. For example, suppose the Sashelp. Class data set contains data about the heights and weights of a teacher's current students. When two new foreign exchange students Ivan and Anna are assigned to her class, she notices that these students are exceptionally tall compared to her current students. She decides to overlay the new student's heights on box plots one for each gender that show the height distributions of her current students.

One way to do this is to create a box plot of the original data and then overlay a scatter plot of the new observations. The following SAS program Creates a data set with the new data. Concatenates the original and the new data. To overlay the plots they should have a common X axis. In this case, the new data can share the Name, Sex, and Age variables of the original data, but you should create NEW variables that describe the heights and weights of the new students.

In this way only the original observations are used to construct the box plots and only the new observations are used to overlay the scatter plot. This means that plots that change the background such as a BLOCK plot should be specified first, and plots that are use markers should be specified last. The following example demonstrates overlaying three plots.

Examine 2. The average number of characters across all emails can be estimated using the sample data. Recall that email50 is a sample from email. In Chapter 5 and beyond, we will develop tools to characterize the reliability of point estimates, and we will find that point estimates based on larger samples tend to be more reliable than those based on smaller samples.

Example 2. We might like to compute the average income per person in the US. To do so, we might first think to take the mean of the per capita incomes across the 3, counties in the county data set. What would be a better approach? Solution The county data set is special in that each county actually represents many individual people. If we were to simply average across the income variable, we would be treating counties with 5, and 5,, residents equally in the calculations.

Instead, we should compute the total income for each county, add up all the counties' totals, and then divide by the number of people in all the counties. However, we have provided an online supplement on weighted means for interested readers: The median provides another measure of center. The median splits an ordered data set in half. There are 50 character counts in the email50 data set an even number so the data are perfectly split into two groups of Median: the number in the middle.

In an ordered data set, the median is the observation right in the middle. If there are an even number of observations, the median is the average of the two middle values. Graphically, we can think of the mean as the balancing point. Figure 2.

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