Today:

**Scatterplot AKA bivariate plot**- Line-graph
- Boxplot
- Barplot AKA Barchart AKA bargraph
- Histogram

Mon Sep 26, 2016

Today:

**Scatterplot AKA bivariate plot**- Line-graph
- Boxplot
- Barplot AKA Barchart AKA bargraph
- Histogram

Let's re-run our example from last time:

# Load packages library(dplyr) library(ggplot2) # Create data frame simple_ex <- data_frame( A = c(1, 2, 3, 4), B = c(1, 2, 3, 4), C = c(3, 2, 1, 2), D = c("a", "a", "b", "b") ) simple_ex

A statistical graphic is a mapping of `data`

variables to `aes()`

thetic attributes of `geom_`

etric objects.

- Drill down on
`geom_point()`

- Introduce two techniques for
**over-plotting**. See saw this phenomenon in the Lec05 Learning Check discussion.`alpha`

to control**transparency**`geom_jitter()`

: a kind of`geom_point()`

where we add a little**jitter**(i.e. random noise) to the points to break log-jams