Calculating the mean vector
The first step in analyzing multivariate data is computing the mean vector. The wine dataset consists of several variables. You will calculate the mean vector of the first four numeric variables, Alcohol, Malic, Ash, Alcalinity, which are located in columns 2 through 5. When observations in a dataset have different subgroups, like wine type, it is also helpful to calculate the mean vector by group.
Bu egzersiz
Multivariate Probability Distributions in R
kursunun bir parçasıdırEgzersiz talimatları
- Calculate the mean of the variables first four numeric variables, which appears in column
2:5using functioncolMeans(). - Calculate the mean of the above variables for each of the wine types, using the
by()function.
Uygulamalı interaktif egzersiz
Bu örnek kodu tamamlayarak bu egzersizi bitirin.
# Calculate the mean of the Alcohol, Malic, Ash, and Alcalinity variables
colMeans(wine[___])
# Calculate the mean of the variables by wine type
by(wine[___], wine$___, colMeans)