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dplyr でプログラミング

Dr. Chester Ismay

Educator, Data Scientist, and R/Python Consultant

world_bank_data の列名

names(world_bank_data)

 [1] "iso"                   "country"               "continent"            
 [4] "region"                "year"                  "infant_mortality_rate"
 [7] "fertility_rate"        "perc_electric_access"  "perc_college_complete"
[10] "perc_cvd_crd_70"       "unemployment_rate"     "perc_rural_pop"

select() で移動

reordered_wb <- world_bank_data %>% 
    select(iso:year,

    matches("^perc"),

    everything())

names(reordered_wb)

 [1] "iso"                   "country"               "continent"           
 [4] "region"                "year"                  "perc_electric_access" 
 [7] "perc_college_complete" "perc_cvd_crd_70"       "perc_rural_pop"       
[10] "infant_mortality_rate" "fertility_rate"        "unemployment_rate"

代わりに last_col() を使用

world_bank_data %>% 
    select(iso:year, 
    matches("^perc"),

    infant_mortality_rate:last_col()) %>%

    names()

 [1] "iso"                   "country"               "continent"         
 [4] "region"                "year"                  "perc_electric_access" 
 [7] "perc_college_complete" "perc_cvd_crd_70"       "perc_rural_pop"       
[10] "infant_mortality_rate" "fertility_rate"        "unemployment_rate"

relocate() と .after の方が簡単

world_bank_data %>% 

    relocate(matches("^perc"), .after = year) %>%

    names()

 [1] "iso"                   "country"               "continent"           
 [4] "region"                "year"                  "perc_electric_access" 
 [7] "perc_college_complete" "perc_cvd_crd_70"       "perc_rural_pop"       
[10] "infant_mortality_rate" "fertility_rate"        "unemployment_rate"

relocate() と .before

world_bank_data %>%
  relocate(matches("^perc"), 
           .before = infant_mortality_rate) %>%

  names()

 [1] "iso"                   "country"               "continent"           
 [4] "region"                "year"                  "perc_electric_access" 
 [7] "perc_college_complete" "perc_cvd_crd_70"       "perc_rural_pop"       
[10] "infant_mortality_rate" "fertility_rate"        "unemployment_rate"

練習しましょう！

dplyr でプログラミング