Posts Tagged ‘ Getting Started ’

Convert a vector to a string

July 27, 2015
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Convert a vector to a string

Base SAS contains many functions for processing strings, and you can call these functions from within a SAS/IML program. However, sometimes a SAS/IML programmer needs to process a vector of strings. No problem! You can call most Base SAS functions with a vector of parameters. I have previously written about […] The post Convert a vector to a string appeared first on The DO Loop.

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Create a density curve with shaded tails

July 20, 2015
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Create a density curve with shaded tails

A SAS programmer wanted to plot the normal distribution and highlight the area under curve that corresponds to the tails of the distribution. For example, the following plot shows the lower decile shaded in blue and the upper decile shaded in red. An easy way to do this in SAS […] The post Create a density curve with shaded tails appeared first on The DO Loop.

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Compare the performance of algorithms in SAS

July 13, 2015
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Compare the performance of algorithms in SAS

As my colleague Margaret Crevar recently wrote, it is useful to know how long SAS programs take to run. Margaret and others have written about how to use the SAS FULLSTIMER option to monitor the performance of the SAS system. In fact, SAS distributes a macro that enables you to […] The post Compare the performance of algorithms in SAS appeared first on The DO Loop.

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An easy way to use numbers for column headers

June 29, 2015
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An easy way to use numbers for column headers

When I am computing with SAS/IML matrices and vectors, I often want to label the columns or rows so that I can better understand the data. The labels are called headers, and the COLNAME= and ROWNAME= options in the SAS/IML PRINT statement enable you to add headers for columns and […] The post An easy way to use numbers for column headers appeared first on The DO Loop.

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Everything you wanted to know about writing SAS/IML modules

June 17, 2015
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Everything you wanted to know about writing SAS/IML modules

One of the fundamental principles of computer programming is to break a task into smaller subtasks and to modularize the program by encapsulating each subtask into its own function. I have written many blog posts over the years about how to define and use functions in the SAS/IML language. I […] The post Everything you wanted to know about writing SAS/IML modules appeared first on The DO Loop.

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SAS/IML functions that operate on columns of a matrix

June 1, 2015
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SAS/IML functions that operate on columns of a matrix

A SAS programmer asked for a list of SAS/IML functions that operate on the columns of an n x p matrix and return a 1 x p row vector of results. The functions that behave this way tend to compute univariate descriptive statistics such as the mean, median, standard deviation, and quantiles. The following […] The post SAS/IML functions that operate on columns of a matrix appeared first on The DO Loop.

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Five reasons to use ODS EXCLUDE to suppress SAS output

May 28, 2015
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Five reasons to use ODS EXCLUDE to suppress SAS output

I previously wrote about the best way to suppress output from SAS procedures. Suppressing output is necessary in simulation and bootstrap analyses, and it is useful in other contexts as well. In my previous article, I wrote, "many programmers use ODS _ALL_ CLOSE as a way to suppress output, but […] The post Five reasons to use ODS EXCLUDE to suppress SAS output appeared first on The DO Loop.

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Finding observations that satisfy multiple conditions: The LOC-ELEMENT technique

May 11, 2015
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Finding observations that satisfy multiple conditions: The LOC-ELEMENT technique

A common task in data analysis is to locate observations that satisfy multiple criteria. For example, you might want to locate all zip codes in certain counties within specified states. The SAS DATA step contains the powerful WHERE statement, which enables you to extract a subset of data that satisfy […] The post Finding observations that satisfy multiple conditions: The LOC-ELEMENT technique appeared first on The DO Loop.

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An easy way to clear your SAS titles

May 4, 2015
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An easy way to clear your SAS titles

Did you know that if you have set multiple titles in SAS, that there is an easy way to remove them? For example, suppose that you've written the following statements, which call the TITLE statement to set three titles: title "A Great Big Papa Title"; title2 "A Medium-sized Mama Title"; […] The post An easy way to clear your SAS titles appeared first on The DO Loop.

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Sum a series in SAS

April 22, 2015
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Sum a series in SAS

A customer asked: How do we go about summing a finite series in SAS? For example, I want to compute for various integers n ≥ 3. I want to output two columns, one for the natural numbers and one for the summation of the series. Summations arise often in statistical […] The post Sum a series in SAS appeared first on The DO Loop.

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