Blog Archives

SAS and R included on R bloggers

December 18, 2009
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SAS and R included on R bloggers

The R bloggers site is an aggregator for blogs about R. We're excited to be joining that community and suggest any readers of this blog may also find it useful.

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Example 7.18: Displaying missing value categories in a table

December 14, 2009
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Example 7.18: Displaying missing value categories in a table

When displaying contingency tables (section 2.3.1), there are times when it is useful to either show or hide the missing data category. Both SAS and the typical R command default to displaying the table only for observations where both factors are observed.In this example, we generate some multinomial data (section 1.10.4) and then produce tables with and without...

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Example 7.15: A more complex sales graphic

October 13, 2009
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Example 7.15: A more complex sales graphic

The plot of Amazon sales rank over time generated in example 7.14 leaves questions. From a software perspective, we'd like to make the plot prettier, while we can embellish the plot to inform our interpretation about how the rank is calculated.For the latter purpose, we'll create an indicator of whether the rank was recorded in nighttime (eastern US...

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Example 7.14: A simple graphic of sales

September 29, 2009
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Example 7.14: A simple graphic of sales

In this example, we show a simple plot of the sales rank data read in as shown in example 7.13.SASIn SAS, we use the symbol statement (section 5.3) to request small (with the h option) dots (with the v option, and that the dots not be connected (with the i option. (See sections 5.2.2, 5.3.9 for more details.)we...

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Example 7.11: Plot an empirical cumulative distribution function from scratch

August 31, 2009
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Example 7.11: Plot an empirical cumulative distribution function from scratch

In example 7.8, we used built-in functions to produce an empirical CDF plot. But the empirical cumulative distribution function (CDF) is simple to calculate directly, and it might be useful to have more control over its appearance than is afforded by...

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Example 7.10: Get data from R into SAS

August 13, 2009
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Example 7.10: Get data from R into SAS

In our previous entry, we described how to generate a dataset from SAS that could be used for analyses in R. Alternatively, someone primarily using R might want to test the new ”statistical graphics” procedures available starting with SAS 9.2. Her...

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Example 7.9: Get data from SAS into R

August 8, 2009
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Example 7.9: Get data from SAS into R

Some people use both SAS and R in their daily work. They might be more familiar with SAS as a tool for manipulating data and R preferable for plotting purposes. While our goal in the book is to enable people to avoid having to switch back and forth, ...

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Example 7.8: Plot two empirical cumulative density functions using available tools

August 1, 2009
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Example 7.8: Plot two empirical cumulative density functions using available tools

The empirical cumulative density function (CDF) (section 5.1.16) is a useful way to compare distributions between populations. The Kolmogorov-Smirnov (section 2.4.2) statistic D is the value of x with the maximum distance between the two curves. As an...

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Book now shipping from Amazon

July 27, 2009
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Book now shipping from Amazon

Amazon now reports that the book is in stock! The current discount is 13%.Or, order from the publisher. If you are an ASA member, you can use the online discount code 634LH to obtain a 15% discount.

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Example 7.7: Tabulate binomial probabilities

July 25, 2009
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Example 7.7: Tabulate binomial probabilities

Suppose we wanted to assess the probability P(X=x) for a binomial random variate with n = 10 and with p = .81, .84, ..., .99. This could be helpful, for example, in various game settings. In SAS, we find the probability that X=x using differences in t...

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