Introduction 2 different scenarios Independent samples Paired samples Introduction In a previous article, we showed how to compare two groups under different scenarios using the Student’s t-test. The Student’s t-test requires that the distributions follow a normal distribution1. In this article, we show how to compare two groups when ...

Introduction Prerequisite Step-by-step guide Additional notes Introduction The COVID-19 virus led many people to create interactive apps and dashboards. A reader recently asked me how to publish a Shiny app she just created. Similarly to a pre...

Introduction Data Correlation coefficient Between two variables Correlation matrix: correlations for all variables Interpretation of a correlation coefficient Visualizations A scatterplot for 2 variables Scatterplots for several pairs of variables Another simple correlation matrix Correlation test For 2 variables For several pairs of variables Combination of correlation coefficients and correlation tests Introduction ...

Introduction Prerequisite Step-by-step guide Additional notes Introduction Few days ago, a colleague asked me how to upload some R code on GitHub in order to make it accessible to everyone. Due to the lockdown, I could not just go into his offi...

Introduction New hospital admissions New confirmed cases Introduction This is a joint work with Prof. Niko Speybroeck and Angel Rosas-Aguirre. Belgium recently started to lift its lockdown measures initially imposed to contain the spread of the...

Introduction In R Data One-proportion test Assumption of prop.test() and binom.test() Chi-square goodness of fit test Does my distribution follow a given distribution? Observed frequencies Expected frequencies Observed vs. expected frequencies By hand One-proportion test Verification in R Goodness of fit test Verification in R Introduction In a ...

Introduction Installation Download all books at once Create a table of Springer books Download only specific books By title By author By subject Acknowledgments Introduction You probably already have seen that Springer released about 500 books for free following the COVID-19 pandemic. According to Springer, these textbooks will be available free ...

Introduction Top R resources on Coronavirus Coronavirus dashboard for your own country Motivations, limitations and structure of the article Analysis of Coronavirus in Belgium A classic epidemiological model: the SIR model Fitting a SIR model to the Belgium data Reproduction number \(R_0\) Using our model to analyze the outbreak if ...

Introduction Top R resources on Coronavirus Coronavirus dashboard: the case of Belgium How to create your own Coronavirus dashboard Additional notes Data Open source Accuracy Coronavirus dashboard: the case of Belgium Introduction The Novel COVID-19 Coronavirus is the hottest topic right now. Every day, the media and newspapers share the ...

Introduction Perform multiple tests at once Concise and easily interpretable results T-test ANOVA To go even further Photo by Teemu Paananen Introduction As part of my teaching assistant position in a Belgian university, students often ask me for some help in their statistical analyses for their master’s thesis. A ...

R Shiny apps Coronavirus tracker COVID-19 outbreak R packages {nCov2019} R code Analyzing COVID-19 outbreak data with R COVID-19 Data Analysis with {tidyverse} and {ggplot2} Data Photo by CDC The Coronavirus is a serious concern around the...

Introduction Null and alternative hypothesis Hypothesis testing Two versions of the one sample t-test How to compute the one sample t-test by hand? Scenario 1: variance of the population is known Scenario 2: variance of the population is unknown How to compute the one sample t-test in R? Scenario 1: variance of the ...

What is probability? 1. A probability is always between 0 and 1 2. Compute a probability 3. Complement of an event 4. Union of two events 5. Intersection of two events 6. Independence of two events 7. Conditional probability Bayes’ theorem Example 8. Accuracy measures False negatives False positives Sensitivity Specificity Positive predictive value Negative predictive value 9. Counting techniques Multiplication ...

Introduction Null and alternative hypothesis Hypothesis testing Different versions of the Student’s t-test How to compute Student’s t-test by hand? Scenario 1: Independent samples with 2 known variances Scenario 2: Independent samples with 2 equal but unknown variances Scenario 3: Independent samples with 2 unequal and unknown variances Scenario 4: Paired samples where the variance ...

Introduction Correlation matrix Correlogram Correlation test Code Photo by Pritesh Sudra Introduction Correlation, often computed as part of descriptive statistics, is a statistical tool used to study the relationship between two variables, ...

R Markdown: what, why and how? Before you start Components of a .Rmd file YAML header Code chunks Text Code inside text Images Tables Additional notes and useful resources Photo by Jon Tyson If you have spent some time writing code in R, you probably have heard of generating dynamic ...

What is clustering analysis? Application 1: Computing distances Solution k-means clustering Application 2: k-means clustering Data kmeans() with 2 groups Quality of a k-means partition nstart for several initial centers kmeans() with 3 groups Manual application and verification in R Solution by hand Solution in R Hierarchical clustering Application 3: hierarchical clustering Data Solution by ...

What is a normal distribution? Empirical rule Parameters Probabilities and standard normal distribution Areas under the normal distribution in R and by hand Ex. 1 In R By hand Ex. 2 In R By hand Ex. 3 In R By hand Ex. 4 In R By hand Ex. 5 Why is the normal distribution so ...