Sameer Mathur
mt <- mtcars[c("mpg", "hp", "wt", "am")]
head(mt)
mpg hp wt am
Mazda RX4 21.0 110 2.620 1
Mazda RX4 Wag 21.0 110 2.875 1
Datsun 710 22.8 93 2.320 1
Hornet 4 Drive 21.4 110 3.215 0
Hornet Sportabout 18.7 175 3.440 0
Valiant 18.1 105 3.460 0
mt <- mtcars[c("mpg", "hp", "wt", "am")]
summary(mt)
mpg hp wt am
Min. :10.40 Min. : 52.0 Min. :1.513 Min. :0.0000
1st Qu.:15.43 1st Qu.: 96.5 1st Qu.:2.581 1st Qu.:0.0000
Median :19.20 Median :123.0 Median :3.325 Median :0.0000
Mean :20.09 Mean :146.7 Mean :3.217 Mean :0.4062
3rd Qu.:22.80 3rd Qu.:180.0 3rd Qu.:3.610 3rd Qu.:1.0000
Max. :33.90 Max. :335.0 Max. :5.424 Max. :1.0000
library(Hmisc)
myvars <- c("mpg", "hp", "wt")
describe(mtcars[myvars])
mtcars[myvars]
3 Variables 32 Observations
---------------------------------------------------------------------------
mpg
n missing distinct Info Mean Gmd .05 .10
32 0 25 0.999 20.09 6.796 12.00 14.34
.25 .50 .75 .90 .95
15.43 19.20 22.80 30.09 31.30
lowest : 10.4 13.3 14.3 14.7 15.0, highest: 26.0 27.3 30.4 32.4 33.9
---------------------------------------------------------------------------
hp
n missing distinct Info Mean Gmd .05 .10
32 0 22 0.997 146.7 77.04 63.65 66.00
.25 .50 .75 .90 .95
96.50 123.00 180.00 243.50 253.55
lowest : 52 62 65 66 91, highest: 215 230 245 264 335
---------------------------------------------------------------------------
wt
n missing distinct Info Mean Gmd .05 .10
32 0 29 0.999 3.217 1.089 1.736 1.956
.25 .50 .75 .90 .95
2.581 3.325 3.610 4.048 5.293
lowest : 1.513 1.615 1.835 1.935 2.140, highest: 3.845 4.070 5.250 5.345 5.424
---------------------------------------------------------------------------
library(psych)
myvars <- c("mpg", "hp", "wt")
describe(mtcars[myvars])
vars n mean sd median trimmed mad min max range skew
mpg 1 32 20.09 6.03 19.20 19.70 5.41 10.40 33.90 23.50 0.61
hp 2 32 146.69 68.56 123.00 141.19 77.10 52.00 335.00 283.00 0.73
wt 3 32 3.22 0.98 3.33 3.15 0.77 1.51 5.42 3.91 0.42
kurtosis se
mpg -0.37 1.07
hp -0.14 12.12
wt -0.02 0.17