eatTools (version 0.7.8)

descr: Descriptive statistics for one or several variables

Description

Function computes descriptive statistics for one variable or several variables within a data frame.

Usage

descr (variable, na = NA, p.weights = NULL, na.rm = FALSE, verbose=TRUE)

Value

a data frame with the following columns

N

number of observations

N.valid

number of non-missing observations

Missing

number of missings

Minimum

minimum of numeric variables

Maximum

maximum of numeric variables

Sum

sum of numeric variables

Mean

arithmetic mean of numeric variables

std.err

standard error of the arithmetic mean. Note: for weighted means, standard error is estimated according to Cochran (1977): \(sigma_x^2=n/((n-1)*w_s^2)*Sigma(w_i^2*(x_i-x))\).

sig

p value

Median

median of numeric variables

SD

standard deviation of numeric variables

Var

variance of numeric variables

Arguments

variable

one variable or a data.frame with several variables

na

optional values with should be considered a missing values

p.weights

optional: vector with individual weights if weighted statistics should be computed

na.rm

logical: should missings be removed prior to estimation?

verbose

logical: Print messages to console?

Author

Sebastian Weirich

References

Cochran W. G. (1977). Sampling Techniques (3rd Edn). Wiley, New York

Examples

data(mtcars)
descr(mtcars)