Author Archives: norbert

About norbert

I am post doc at the Department of Medical Psychology and Sociology, Leipzig University (GER), with degrees in sociology (MA) and public health (MPH).

Scoring the St George’s Respiratory Questionnaire (SGRQ) using R

Background The St George's Respiratory Questionnaire (SGRQ) is an instrument for the measuring of Health-Related Quality-of-Life in patients with diseases of airways obstruction. The SGRQ contains 50 items covering three domains: Symptoms (8 items), Activity (16 items), and Impacts (26 … Continue reading

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srir: A new R package for scoring the Severe Respiratory Insufficiency Questionnaire (SRI)

Background The SRI is a multidimensional general health questionnaire “to assess HRQL in patients with chronic respiratory failure due to various underlying diseases” [1]. Based on 49 items, seven sub scales addressing the following domains are calculated: Respiratory Complaints (8 … Continue reading

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How to fix problems after updating to R 3.4.1 on Linux Mint 18.1 / Ubuntu 16.04

The Problem After updating R to version 3.4.1 (“Single Candle”) on Linux Mint 18.1, RStudio could neither find my installed R packages nor was it possible to install R packages into some other directory. The Solution Fortunately, this problem could … Continue reading

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How to calculate Odds Ratios in Case-Control Studies using R

Intro In June 2017 I've started working at the Clinical Trial Centre Leipzig at Leipzig University. Since my knowledge in statistics is rather poor, my employer offered me to attend some seminars in Medical Biometry at the University of Heidelberg. … Continue reading

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How to parse Citavi files using R

Intro In academic writing, the use of reference management software has become essential. A couple of years ago, I started using the free open-source software Zotero. However, most of my workmates at Leipzig University work with Citavi, a commercial software … Continue reading

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How to install and use the hexSticker package

Intro A couple of days ago, the hexSticker package was published on CRAN. The package provides some functions to plot hexagon stickers that may be used to promote R packages. As described on GitHub, the stickers can be plotted either … Continue reading

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How to plot a companion planting guide using ggplot2

Intro Recently my girl-friend asked me whether I could do some data project being useful for our family rather than just for myself. A couple of years ago – after our first son was born – we decided to rent … Continue reading

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