Blog | Danish Institute for Data Science

Nov 17, 20221 min read

dplyr or base R

dplyr and tidyverse are convenient frameworks for data management and technical analytic programming. With more than 25 years of R...

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May 14, 20201 min read

The power of SAS Proc SGPLOT: Survival Plots

Obtaining the power of SGPLOT using ods output features. In the example below I have placed the y-axis label in top horizontal position...

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Dec 17, 20197 min read

Simulation of hemophilia bleeds

A SAS simulation study describing bleeds in hemophilia type A and B patients. Based on the “proof-of-concept study” Randomized,...

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Dec 14, 20191 min read

SAS University Edition load error solution

Using SAS University Edition with VirtualBox in Fedora requires kernel signing of 3 modules. Avoid this by disabling Secure Boot in BIOS...

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Dec 3, 20191 min read

Indicators from numeric factor variables

The macro call below will generate indicators for all factor levels of xfaktor from the data set regdata represented by at least 5...

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Oct 29, 20192 min read

Graphics in SAS SGPLOT illustrating ANOVA analysis results.

Output and graphics from statistical programming packages are often time-consuming to read and interpret. In peer-reviewed publications...

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Oct 29, 20192 min read

T tests in censored normal distribution

T-tests assume normal distributed random variates. We experience designs in which data take on a particular value and are otherwise...

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Apr 19, 20191 min read

Up-and-down dose response study design

Dose response model and biased coin up-and-down design estimating EV90. A simulation study with a boundary condition and addition of...

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Mar 10, 20191 min read

Stata Workflow optimization with GRAPHLOG

The basic workflow recommendations for Stata code and folder hierarchy given by Scott Long is relative easy to extend with inclusion of...

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Mar 10, 20191 min read

Set Exchange Server properties

Guided by principles in GDPR you may wish to delete mail older than 3 months from your inbox. This should be a principle for all office...

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Feb 24, 20191 min read

Half-whiskers plot of difference in treatment effect

Below an alternative graphical representation of difference in treatment effects. data ests; missing z; infile datalines delimiter=','...

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Feb 22, 20191 min read

CUSUM plots for operating time

CUSUM plots have seen application within time series and quality analysis. For both numeric, binary, ordinal and polytomous outcomes we...

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Feb 4, 20198 min read

Comorbidity indexes in SQL

Generating Elixhauser comorbidity index from Danish National Health Register as relational database. (ICD 10 Coding in SAS) A...

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Jan 4, 20192 min read

Produce animation in R illustrating uniform and Gaussian density

#Number of simulations and chunk-size sN <- 265 sM <- 10 #Line from 0 to 1 will be divided into 40 bins bin <- seq(0 + (1 / 40) / 2, 1 -...

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Dec 15, 20182 min read

Prevalence models in health science

I chose to divide generic prediction models applied in health science and administration into two main groups: Models based on general...

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Apr 19, 20181 min read

Illustrative plots and tables (SAS macro)

Basic SAS macros for basic summary statistics and illustrative plots. Features ttests, Van der Waerden and Wilcoxon tests for continuous...

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Dec 28, 20172 min read

Macro scheme for generation of RFM-I data

Recency, frequency, monetary – interaction (RFM-I) are guiding principles for extracting customer data in the process of generating...

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Oct 9, 20171 min read

Extracting variables and estimates from SAS prediction models

SAS ods output statements provide a simple alternative to advanced text manipulation techniques. The example below extracts selected...

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Oct 6, 20171 min read

Extracting selected variables from the hpgenselect procedure using code

Several SAS procedures generate code from which the user may extract critical information. In the example below I extract variables...

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Oct 1, 20172 min read

Modeling gender and age adjusted incidence rates

National Health Institute (NHI) provides a tool box for calculation of cancer incidence and percentage change. Their algorithm for...

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