I’m launching this section as a tutorial on various highly useful functions and operators within the R programming language.

- Which in R
- Paste In R
- Unique in R
- Sum in R – useful for QA (get column totals)
- %in% operator
- Pipe Operator in R (%>%)
- Using Match () and %in% to check a vector

#### Processing Data

#### Merging and Joining Data Frames

#### Text Substitution

#### Dealing with missing values

#### Data Transformation & Analysis

- Log in R – Rescaling data with the log function
- Natural Log in R – more Rescaling!
- Diff in R – calculating difference between vector elements
- Rank in R – assessing the relative value of elements

### Group Operations – Tallying Data

#### How To Articles

- How To Extract Year From Date in R
- How to Make a side by side boxplot in R
- How to calculate percentiles in R
- How to calculate dummy variables in R