Posts Tagged ‘ Statistical Programming ’

Video: Create and use lists and tables in SAS/IML

June 26, 2017
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Video: Create and use lists and tables in SAS/IML

My presentation at SAS Global Forum 2017 was "More Than Matrices: SAS/IML Software Supports New Data Structures." The paper was published in the conference proceedings several months ago, but I recently recorded a short video that gives an overview of using the new data structures in SAS/IML 14.2: If your [...] The post Video: Create and use lists and tables in SAS/IML appeared first on The DO Loop.

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Two ways to compute maximum likelihood estimates in SAS

June 14, 2017
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Two ways to compute maximum likelihood estimates in SAS

In a previous article, I showed two ways to define a log-likelihood function in SAS. This article shows two ways to compute maximum likelihood estimates (MLEs) in SAS: the nonlinear optimization subroutines in SAS/IML and the NLMIXED procedure in SAS/STAT. To illustrate these methods, I will use the same data [...] The post Two ways to compute maximum likelihood estimates in SAS appeared first on The DO Loop.

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Quadratic optimization in SAS

April 12, 2017
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Quadratic optimization in SAS

At SAS Global Forum last week, I saw a poster that used SAS/IML to optimized a quadratic objective function that arises in financial portfolio management (Xia, Eberhardt, and Kastin, 2017). The authors used the Newton-Raphson optimizer (NLPNRA routine) in SAS/IML to optimize a hypothetical portfolio of assets. The Newton-Raphson algorithm [...] The post Quadratic optimization in SAS appeared first on The DO Loop.

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A simple trick to construct symmetric intervals

April 10, 2017
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A simple trick to construct symmetric intervals

Many intervals in statistics have the form p ± δ, where p is a point estimate and δ is the radius (or half-width) of the interval. (For example, many two-sided confidence intervals have this form, where δ is proportional to the standard error.) Many years ago I wrote an article [...] The post A simple trick to construct symmetric intervals appeared first on The DO Loop.

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Nonsmooth models and spline effects

April 5, 2017
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Nonsmooth models and spline effects

Most regression models try to model a response variable by using a smooth function of the explanatory variables. However, if the data are generated from some nonsmooth process, then it makes sense to use a regression function that is not smooth. A simple way to model a discontinuous process in [...] The post Nonsmooth models and spline effects appeared first on The DO Loop.

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Print tables in SAS/IML

April 3, 2017
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Print tables in SAS/IML

One of the advantages of the new mixed-type tables in SAS/IML 14.2 (released with SAS 9.4m4) is the greatly enhanced printing functionality. You can control which rows and columns are printed, specify formats for individual columns, and even use templates to completely customize how tables are printed. Printing a table [...] The post Print tables in SAS/IML appeared first on The DO Loop.

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Lists: Nonmatrix data structures in SAS/IML

March 29, 2017
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Lists: Nonmatrix data structures in SAS/IML

Lists are collections of objects. SAS/IML 14.2 supports lists as a way to store matrices, data tables, and other lists in a single object that you can pass to functions. SAS/IML lists automatically grow if you add new items to them and shrink if you remove items. You can also [...] The post Lists: Nonmatrix data structures in SAS/IML appeared first on The DO Loop.

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Data tables: Nonmatrix data structures in SAS/IML

March 22, 2017
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Data tables: Nonmatrix data structures in SAS/IML

Prior to SAS/IML 14.2, every variable in the Interactive Matrix Language (IML) represented a matrix. That changed when SAS/IML 14.2 (released with SAS 9.4m4) introduced two new data structures: data tables and lists. This article gives an overview of data tables. I will blog about lists in a separate article. [...] The post Data tables: Nonmatrix data structures in SAS/IML appeared first on The DO Loop.

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Simultaneous confidence intervals for multinomial proportions

February 15, 2017
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Simultaneous confidence intervals for multinomial proportions

A categorical response variable can take on k different values. If you have a random sample from a multinomial response, the sample proportions estimate the proportion of each category in the population. This article describes how to construct simultaneous confidence intervals for the proportions as described in the 1997 paper [...] The post Simultaneous confidence intervals for multinomial proportions appeared first on The DO Loop.

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An easy way to run thousands of regressions in SAS

February 13, 2017
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An easy way to run thousands of regressions in SAS

A common question on SAS discussion forums is how to repeat an analysis multiple times. Most programmers know that the most efficient way to analyze one model across many subsets of the data (perhaps each country or each state) is to sort the data and use a BY statement to [...] The post An easy way to run thousands of regressions in SAS appeared first on The DO Loop.

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