R

data-visualization

An R barchart is a fundamental visualization that maps categorical variables to rectangular bar heights, enabling clear comparison across groups. In base R, barplot() produces s...

statistics

The interquartile range (IQR) measures the spread of the middle 50% of a distribution. In R, you can compute it with the base IQR() function or with tidy tools from dplyr and re...

programming

Selecting columns in R is a foundational skill for data analysis and preprocessing. Whether you work with base R data frames or tidyverse tibbles, knowing how to extract one or...

programming

%/% in R is the integer-division operator. It returns the quotient with any fractional part removed, effectively rounding toward negative infinity. For example, 7 %/% 3 equals 2...

programming

Selecting rows by value in R is a core skill for data cleaning, exploration, and reporting. The goal is to extract rows where one or more columns match a specified condition or...

data-visualization

The barplot() function in R produces vertical or horizontal bar charts from numeric vectors, matrices, or tables. It is part of base graphics and is commonly used to show counts...

Guides And Explainers

The warning don't know how to automatically pick scale for object of type data.frame. defaulting to continuous appears when a geom or stat expects a single aesthetic that maps t...

model-diagnostics

The messages glm.fit: algorithm did not converge and glm.fit: fitted probabilities numerically 0 or 1 indicate that the maximum likelihood estimation failed to find a stable sol...