ChickWts

Load dataset

Show the data structure

library(datasets)
dat <- datasets::chickwts
str(dat)

## 'data.frame':    71 obs. of  2 variables:
##  $ weight: num  179 160 136 227 217 168 108 124 143 140 ...
##  $ feed  : Factor w/ 6 levels "casein","horsebean",..: 2 2 2 2 2 2 2 2 2 2 ...

As you can see, the column 2 is the feeds type

List the column 2 (feeds type) for all the dataset

chickwts[,2] 

##  [1] horsebean horsebean horsebean horsebean horsebean horsebean horsebean
##  [8] horsebean horsebean horsebean linseed   linseed   linseed   linseed  
## [15] linseed   linseed   linseed   linseed   linseed   linseed   linseed  
## [22] linseed   soybean   soybean   soybean   soybean   soybean   soybean  
## [29] soybean   soybean   soybean   soybean   soybean   soybean   soybean  
## [36] soybean   sunflower sunflower sunflower sunflower sunflower sunflower
## [43] sunflower sunflower sunflower sunflower sunflower sunflower meatmeal 
## [50] meatmeal  meatmeal  meatmeal  meatmeal  meatmeal  meatmeal  meatmeal 
## [57] meatmeal  meatmeal  meatmeal  casein    casein    casein    casein   
## [64] casein    casein    casein    casein    casein    casein    casein   
## [71] casein   
## Levels: casein horsebean linseed meatmeal soybean sunflower

List the feeds type for all the dataset

chickwts["feed"] 

##         feed
## 1  horsebean
## 2  horsebean
## 3  horsebean
## 4  horsebean
## 5  horsebean
## 6  horsebean
## 7  horsebean
## 8  horsebean
## 9  horsebean
## 10 horsebean
## 11   linseed
## 12   linseed
## 13   linseed
## 14   linseed
## 15   linseed
## 16   linseed
## 17   linseed
## 18   linseed
## 19   linseed
## 20   linseed
## 21   linseed
## 22   linseed
## 23   soybean
## 24   soybean
## 25   soybean
## 26   soybean
## 27   soybean
## 28   soybean
## 29   soybean
## 30   soybean
## 31   soybean
## 32   soybean
## 33   soybean
## 34   soybean
## 35   soybean
## 36   soybean
## 37 sunflower
## 38 sunflower
## 39 sunflower
## 40 sunflower
## 41 sunflower
## 42 sunflower
## 43 sunflower
## 44 sunflower
## 45 sunflower
## 46 sunflower
## 47 sunflower
## 48 sunflower
## 49  meatmeal
## 50  meatmeal
## 51  meatmeal
## 52  meatmeal
## 53  meatmeal
## 54  meatmeal
## 55  meatmeal
## 56  meatmeal
## 57  meatmeal
## 58  meatmeal
## 59  meatmeal
## 60    casein
## 61    casein
## 62    casein
## 63    casein
## 64    casein
## 65    casein
## 66    casein
## 67    casein
## 68    casein
## 69    casein
## 70    casein
## 71    casein