Learn to use the {dplyr} package in R which helps you to solve the most common data manipulation challenges — Introduction In a previous post, we showed how to manipulate data in R. In particular, we illustrated how to create and manipulate vectors, factors, lists and data frames. This served as an introduction to R and was aimed at beginners. Moreover, as long as it was possible, all manipulations were made…

I am happy to announce that our paper has been accepted for publication in Nutrients (ISSN 2072–6643) (Houben et al. 2023). This study investigates the impact of a food rebalancing program associated with plant-derived food supplements on the biometric, behavioral, and biological parameters of obese subjects. Read more here. Thanks…

Learn how to compute the Pearson, Spearman, and Kendall correlation coefficients by hand to evaluate the relationship between two variables — Introduction In statistics, a correlation is used to evaluate the relationship between two variables. In a previous post, we showed how to compute a correlation and perform a correlation test in R. In this post, we illustrate how to compute the Pearson, Spearman, and Kendall correlation coefficients by hand and under…

Learn how to perform a one-way Analysis Of VAriance (ANOVA) by hand to compare a quantitative measure between three groups or more — Introduction An ANOVA is a statistical test used to compare a quantitative variable between groups to determine if there is a statistically significant difference between several population means. In practice, it is usually used to compare three or more groups. …

Learn how to scrape Yahoo search engine results with R using the {rvest} package — Introduction Web scraping is the process of extracting data from websites. It is usually done in an automated manner to obtain a large amounts of data through various websites, without the need to gather data by hand. In a previous post, we introduced this method and illustrated it with a Wikipedia…

Learn how to do a two-way ANOVA in R. You will also learn its aim, hypotheses, assumptions, and how to interpret the results. — Introduction The two-way ANOVA (analysis of variance) is a statistical method that allows to evaluate the simultaneous effect of two categorical variables on a quantitative continuous variable. The two-way ANOVA is an extension of the one-way ANOVA since it allows to evaluate the effects on a numerical response of two categorical…

I am happy to announce that a paper I contributed to has been accepted for publication in Open Forum Infectious Diseases (Truong et al. 2023). This study investigates bacterial meningitis among children aged under five years in Southern Vietnam for the last 10 years. Read more here. I hope this…

Discover the most common carer options available with a degree in statistics, with a description of each role and the required skills to pursue these jobs — This post has been written in collaboration with Daniel Williams. Introduction A reader recently contacted me because he was hesitating between starting his studies in statistics or economics. I studied economics and I am now doing a PhD in statistics, so he reached out to me to know what I thought…

In this post, I highlight the 10 most common errors in R and how to fix them. I also mention a couple of warnings (which are different than errors). — Introduction If you are just starting with R, you will often encounter errors in your code which prevent it to run. I remember when I was just starting to use R, errors in my code were so frequent that I almost gave up learning this programming language. I even recall that…