## Overview

- What’s DA? What’s DA for? 科學方法（王若琳）
- Modules of data analysis
- Examples
- Iris Data (Slides of Duyen Do)

- Coding: R

### Questions

- Dig out the R built-in data set related to “ToothGrowth”
- Among the variables of the data set, which one is the categorical variable (factor)?
- Construct the graph of two histograms where the upper histogram for the numerical variable with larger average while the lower histogram for the other numerical variable.

### Practice & Play

- vectors in R (vector01.r)
- Data import/點名/抽籤/排序 (data: pklist2.txt
**, code: pklist.gen.r**)

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