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avahoffman merged 2 commits into from
Jun 11, 2026
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Classes: Format table / cleanup #366

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674493e
Format table / cleanup
avahoffman Jun 11, 2026
d32e376
A little formatting of the table and cleaning things up
avahoffman Jun 11, 2026
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24 changes: 12 additions & 12 deletions modules/Data_Classes/Data_Classes.Rmd
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Expand Up @@ -139,33 +139,33 @@ Examples:

## Classes Overview

| Example | Class | Type | Notes |
|:---:|:---:|:---:|---|
| 1.1 | Numeric | double | default for numbers |
| 1 | integer | integer | Need to coerce to integer with as.integer() or use sample() or seq() with whole numbers |
| "FALSE", "Ball" | Character | Character | Need quotes |
| FALSE, TRUE | logical | logical | No quotes |
| "Small", "Large" | Factor | Factor | Need to coerce to factor with factor() |
| Example | Class | Type | Notes |
|:----------------:|:---------:|:---------:|----------------------------------------------------------------------------------------------------|
| 1.1 | numeric | double | Default for numbers |
| 1 | integer | integer | Need to coerce to integer with `as.integer()` or use `sample()` or `seq()` to create whole numbers |
| "FALSE", "Ball" | character | character | Need quotes |
| FALSE, TRUE | logical | logical | No quotes, 0 and 1, respectively |
| "Small", "Large" | factor | factor | Need to coerce to factor with `factor()` |

# Special data classes

## Dates

There are two most popular R classes used when working with dates and times:

- `Date` class representing a calendar date
- `POSIXct` class representing a calendar date with hours, minutes, seconds
- `Date` class - a calendar date
- `POSIXct` class - a calendar date with hours, minutes, seconds

We convert data from character to `Date`/`POSIXct` to use functions to manipulate date/date and time
Converting data from character to `Date`/`POSIXct` allows special functions date/date and time

`lubridate` is a powerful, widely used R package from "tidyverse" family to work with `Date` / `POSIXct` class objects
`lubridate` (part of `tidyverse`) helps work with `Date` / `POSIXct` class objects

## Creating `Date` class object

```{r, message = FALSE}
class("2021-06-15")

library(lubridate)
library(tidyverse) # Contains lubridate

x <- ymd("2021-06-15") # lubridate package Year Month Day
class(x)
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