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Classify the participants into the following `age_group`s

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# Required packages

```r

install.packages("tidyverse")

```

# Default path

If you don't use RStudio, you need to set the working directory to the same folder with the `.Rproj` file.

# Filtering and ordering

# ===

# Goal: Filter the tibble for "dog" owners. 

#       Then, order the result from Z to A according to the name of the `owner`. 

# Functions: filter(), str_detect(), arrange(), desc()

# Example output: 

#      # A tibble: 2 x 2

#        owner  pet                 

#        <chr>  <chr>               

#      1 Sanjiv white dog           

#      2 Gunnar dog with an attitude

#

# Relevant R4DS chapter: https://r4ds.had.co.nz/transform.html?q=filter#filter-rows-with-filter

 

#===============================================================================

# Mutating and condition

# ===

# Goals: 

# 1. Classify the participants into the following `age_group`s:

#     * Baby: 0 - 2

#     * Young adults: 3 - 39

#     * Middle-aged adults: 40 - 59

#     * Old adults: ≥ 60.

#

# 2. Add a column to indicate `score_level`: low (< 6) or high (≥ 6).

#

# Functions: 

#   * mutate(), between()

#   * Use this function once: if_else()

#   * Use this function once: case_when()

# Example output: 

#

#      # A tibble: 10 x 5

#         participant_id   age score age_group          score_level

#         <chr>          <dbl> <dbl> <chr>              <chr>      

#       1 P01               43     5 Middle-aged adults low        

#       2 P02               40     4 Middle-aged adults low        

#       3 P03               29     7 Young adults       high       

#       4 P04               84     7 Old adults         high       

#       5 P05               89     3 Old adults         low        

#       6 P06                6     7 Young adults       high       

#       7 P07               57     9 Middle-aged adults high       

#       8 P08               71     4 Old adults         low        

#       9 P09               88     7 Old adults         high       

#      10 P10               13     9 Young adults       high     

#

# Relevant R4DS chapter: 

# * https://r4ds.had.co.nz/transform.html

# * Additionally, this "Missing values" section https://r4ds.had.co.nz/exploratory-data-analysis.html#missing-values-2

 

#===============================================================================

 

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