高效R语言编程

高效数据木匠

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125

练习

1.

逐行运行前面的每个链例程，第一个例子的头两行条目如下：

wb_ineq

#> # A tibble: 6,925

×

9

#> Country code Year `Year Code` top10 bot10 gini b40_cons

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

#> 1 Afghanistan AFG 1974 YR1974 NA NA NA NA

#> 2 Afghanistan AFG 1975 YR1975 NA NA NA NA

#> 3 Afghanistan AFG 1976 YR1976 NA NA NA NA

#> 4 Afghanistan AFG 1977 YR1977 NA NA NA NA

#> # ... with 6,921 more rows, and 1 more variables: gdp_percap <dbl>

紧跟着：

wb_ineq %>%

select

（

Year, gini

）

#> # A tibble: 6,925

×

2

#> Year gini

#> <int> <dbl>

#> 1 1974 NA

#> 2 1975 NA

#> 3 1976 NA

#> 4 1977 NA

#> # ... with ...