View source: R/draw_multivariate.R
draw_multivariate | R Documentation |
Draw multivariate random variables
draw_multivariate(formula, sep = "_")
formula |
Formula describing the multivariate draw. The lefthand side is the names or prefix and the right-hand side is the multivariate draw function call, such as mvrnorm from the MASS library or rmnom from the extraDistr library. |
sep |
Separator string between prefix and variable number. Only used when a single character string is provided and multiple variables created. |
tibble
library(MASS) # draw from multivariate normal distribution dat <- draw_multivariate(c(Y_1, Y_2) ~ mvrnorm( n = 500, mu = c(0, 0), Sigma = matrix(c(1, 0.5, 0.5, 1), 2, 2) )) cor(dat) # equivalently, you can provide a prefix for the variable names # (easier if you have many variables) draw_multivariate(Y ~ mvrnorm( n = 5, mu = c(0, 0), Sigma = matrix(c(1, 0.5, 0.5, 1), 2, 2) )) # within fabricate fabricate( N = 100, draw_multivariate(c(Y_1, Y_2) ~ mvrnorm( n = N, mu = c(0, 0), Sigma = matrix(c(1, 0.5, 0.5, 1), 2, 2) )) ) # You can also write the following, which works but gives less control over the names fabricate(N = 100, Y = mvrnorm( n = N, mu = c(0, 0), Sigma = matrix(c(1, 0.5, 0.5, 1), 2, 2) ))
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