str2cov {ICED}

converts a ICED measurement structure data.frame and a vector

Description

helper function to generate an expected covariance matrix from an ICED measurement structure and vector of variances. Not expected to be called directly, but used within sim_ICED

Usage

str2cov(structure, variances, e_label = "e")

Arguments

structure

data.frame describing the structure of the data, with each variable convering a design aspect - see example. Note: currently the first variable must be time and include a different value for each repeated measure.

variances

list of variances for each source of variance

e_label

sting label for error variance. defaults to "e"

Value

returns a matrix

Examples

struc <- data.frame(time = c("T1", "T2", "T3", "T4"),
day = c("day1","day1","day2","day2"),
session = c("ses1", "ses1","ses2", "ses3"))
 
str2cov(struc,
list(time = 10,
     day = 2,
     session = 1,
     e = 3))