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.
Este ejercicio forma parte del curso
Multivariate Probability Distributions in R
Instrucciones del ejercicio
- 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.
Ejercicio interactivo práctico
Prueba este ejercicio y completa el código de muestra.
# 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)