R summarise求最大值 最小值 平均值

R summarise求最大值 最小值 平均值

mtcars是R Studio自带的数据集datasets里包含的,可以直接使用或datasets::iris这样引用.
library(help = "datasets")可以看到详细的数据集列表.

> mtcars %>% head()mpg cyl disp  hp drat    wt  qsec vs am gear carb
Mazda RX4         21.0   6  160 110 3.90 2.620 16.46  0  1    4    4
Mazda RX4 Wag     21.0   6  160 110 3.90 2.875 17.02  0  1    4    4
Datsun 710        22.8   4  108  93 3.85 2.320 18.61  1  1    4    1
Hornet 4 Drive    21.4   6  258 110 3.08 3.215 19.44  1  0    3    1
Hornet Sportabout 18.7   8  360 175 3.15 3.440 17.02  0  0    3    2
Valiant           18.1   6  225 105 2.76 3.460 20.22  1  0    3    1> mtcars %>% summarise(n = n(), mean = mean(disp), max = max(disp), min = min(disp))n     mean max  min
1 32 230.7219 472 71.1> mtcars %>% count()n
1 32> mtcars %>% summary()mpg             cyl             disp             hp             drat             wtMin.   :10.40   Min.   :4.000   Min.   : 71.1   Min.   : 52.0   Min.   :2.760   Min.   :1.5131st Qu.:15.43   1st Qu.:4.000   1st Qu.:120.8   1st Qu.: 96.5   1st Qu.:3.080   1st Qu.:2.581Median :19.20   Median :6.000   Median :196.3   Median :123.0   Median :3.695   Median :3.325Mean   :20.09   Mean   :6.188   Mean   :230.7   Mean   :146.7   Mean   :3.597   Mean   :3.2173rd Qu.:22.80   3rd Qu.:8.000   3rd Qu.:326.0   3rd Qu.:180.0   3rd Qu.:3.920   3rd Qu.:3.610Max.   :33.90   Max.   :8.000   Max.   :472.0   Max.   :335.0   Max.   :4.930   Max.   :5.424qsec             vs               am              gear            carbMin.   :14.50   Min.   :0.0000   Min.   :0.0000   Min.   :3.000   Min.   :1.0001st Qu.:16.89   1st Qu.:0.0000   1st Qu.:0.0000   1st Qu.:3.000   1st Qu.:2.000Median :17.71   Median :0.0000   Median :0.0000   Median :4.000   Median :2.000Mean   :17.85   Mean   :0.4375   Mean   :0.4062   Mean   :3.688   Mean   :2.8123rd Qu.:18.90   3rd Qu.:1.0000   3rd Qu.:1.0000   3rd Qu.:4.000   3rd Qu.:4.000Max.   :22.90   Max.   :1.0000   Max.   :1.0000   Max.   :5.000   Max.   :8.000

更多:.7.8/topics/summarise