random.yx: Generates random bivariate scores

In statpsych: Statistical Methods for Psychologists

Generates random bivariate scores

Description

Generates a random sample of y scores and x scores from a bivariate normal distributions with specified population means, standard deviations, and correlation. This function is useful for generating hypothetical data for classroom demonstrations.

Usage

random.yx(n, my, mx, sdy, sdx, cor, dec)

Arguments

n	sample size
my	population mean of y scores
mx	population mean of x scores
sdy	population standard deviation of y scores
sdx	population standard deviation of x scores
cor	population correlation between x and y
dec	number of decimal points

Value

Returns n pairs of y and x scores

Examples

random.yx(10, 50, 20, 4, 2, .5, 1)

# Should return: 
#        y    x
#  1  50.3 21.6
#  2  52.0 21.6
#  3  53.0 22.7
#  4  46.9 21.3
#  5  56.3 23.8
#  6  50.4 20.3
#  7  44.6 19.9
#  8  49.9 18.3
#  9  49.4 18.5
# 10  42.3 20.2
 

statpsych documentation built on Sept. 11, 2024, 7:42 p.m.