R Data Reshaping

R mean() Function – Calculating Average

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Basic Math Statistical Functions Probability Distributions Vector Operations Strings Data Frames Apply Family Plotting Date and Time Lists and Factors File IO Missing Values

Basic Math Functions

Basic Math Functions

17 Articles

▸mean() Average ▸median() Median ▸sum() Sum ▸min() / max() Min/Max Values ▸range() Numeric Range ▸prod() Product ▸cumsum() Cumulative Sum ▸diff() Difference ▸abs() Absolute Value ▸round() Rounding ▸sqrt() Square Root ▸log() Logarithm ▸exp() Exponential ▸sin() Trigonometric Functions ▸factorial() Factorial ▸choose() Combination Number ▸ceiling() / floor() Rounding

Statistical Functions

Statistical Functions

11 Articles

▸sd() Standard Deviation ▸var() Variance ▸quantile() Quantile ▸summary() Data Summary ▸cor() Correlation Coefficient ▸cov() Covariance ▸scale() Standardization ▸t.test() t-test ▸chisq.test() Chi-square Test ▸aov() Analysis of Variance ▸lm() Linear Regression

Probability Distributions

Probability Distributions

8 Articles

▸rnorm() Normal Distribution Random Numbers ▸dnorm() / pnorm() / qnorm() ▸rbinom() Binomial Distribution ▸rpois() Poisson Distribution ▸runif() Uniform Distribution ▸rexp() Exponential Distribution ▸sample() Random Sampling ▸set.seed() Random Seed

Vector Operations

Vector Operations

13 Articles

▸seq() Generate Sequence ▸rep() Repeat Elements ▸sort() Sorting ▸order() Sorting Index ▸rev() Reverse ▸unique() Remove Duplicates ▸which() Conditional Index ▸match() Element Matching ▸append() Append ▸cut() Binning ▸ifelse() Conditional Judgment ▸table() Frequency Statistics ▸Calculate Most Frequent Element

String Operations

String Operations

9 Articles

▸paste() String Concatenation ▸sprintf() Formatted Output ▸substr() Extract Substring ▸strsplit() Split ▸grep() Pattern Matching ▸gsub() Replacement ▸nchar() Number of Characters ▸toupper() / tolower() Uppercase/Lowercase ▸trimws() Remove Whitespace

Data Frame Operations

Data Frame Operations

10 Articles

▸data.frame() Create Data Frame ▸subset() Data Filtering ▸merge() Merging ▸rbind() / cbind() Row/Column Binding ▸head() / tail() View Head/Tail ▸names() Name Operations ▸str() View Structure ▸dim() / nrow() / ncol() Dimensions ▸colnames() / rownames() Row/Column Names ▸transform() Data Transformation

Apply Family

Apply Family Functions

5 Articles

▸apply() Array Application ▸lapply() List Application ▸sapply() Simplified Application ▸tapply() Grouped Statistics ▸mapply() Multivariate Application

Basic Plotting

Basic Plotting

10 Articles

▸plot() Scatter Plot ▸hist() Histogram ▸barplot() Bar Plot ▸boxplot() Box Plot ▸pie() Pie Chart ▸plot() Graphic Types Detailed ▸par() Graphic Parameters ▸legend() Add Legend ▸abline() Reference Line ▸Linear Regression Example

Date and Time

Date and Time

4 Articles

▸as.Date() Date Conversion ▸format() Date Formatting ▸difftime() Time Difference ▸seq.Date() Date Sequence

Lists and Factors

Lists and Factors

5 Articles

▸list() Create List ▸unlist() Flatten List ▸factor() Create Factor ▸levels() Factor Levels ▸gl() Generate Factors

File IO and System

File IO and System

7 Articles

▸read.csv() Read CSV ▸write.csv() Write CSV ▸read.table() Read Table ▸scan() Read Data ▸install.packages() Install Packages ▸library() / require() Load Packages ▸getwd() / setwd() Working Directory

Missing Values and Data Cleaning

Missing Values and Data Cleaning

1 Article

▸is.na() Missing Value Handling

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R Data Reshaping

R mean() Function – Calculating Average