R Programming Quizzes (MCQs)

    
            Level 1
            Fundamentals
            Syntax & Data Structures
        
                    R Environment
                    Assignment (<-), Data Types, Relational Operators
                
                    01_BASICS
                    
                    Vectors & Matrices
                    c(), Indexing, Recycling, rbind/cbind
                
                    02_VEC_MAT
                    
                    Lists & Data Frames
                    df$col, Subsetting, Factors, Levels
                
                    03_STRUCT
                    
            Level 2
            Programming
            Logic & Data Wrangling
        
                    Control Flow
                    If/Else, Loops, Custom Functions
                
                    04_FLOW
                    
                    The Tidyverse
                    Pipes (%>%), Filter, Select, Mutate
                
                    05_TIDY
                    
                    Joins & Reshaping
                    Left Join, Pivot Longer/Wider
                
                    06_RESHAPE
                    
            Level 3
            Analysis
            Visualization & Statistics
        
                    Data Viz (ggplot2)
                    Grammar of Graphics, Geoms, Faceting
                
                    07_GGPLOT
                    
                    Probability
                    Normal (rnorm), Binomial, Distributions
                
                    08_PROB
                    
                    Hypothesis & Regression
                    T-tests, ANOVA, Linear Models (lm)
                
                    09_STATS
                    
            Level 4
            Applied
            Advanced R & Special Topics
        
                    The Apply Family
                    lapply, sapply, tapply, Functional Ops
                
                    10_APPLY
                    
                    Strings & Dates
                    Regex, stringr, lubridate Package
                
                    11_STR_DATE
                    
                    Robust R
                    tryCatch, Debugging, Error Handling
                
                    12_ERROR