# reStruct

0th

Percentile

##### Random Effects Structure

This function is a constructor for the reStruct class, representing a random effects structure and consisting of a list of pdMat objects, plus a settings attribute containing information for the optimization algorithm used to fit the associated mixed-effects model.

Keywords
models
##### Usage
reStruct(object, pdClass, RML, data)
##### Arguments
object
any of the following: (i) a one-sided formula of the form ~x1+...+xn | g1/.../gm, with x1+...+xn specifying the model for the random effects and g1/.../gm the grouping structure (m may be equal
pdClass
an optional character string with the name of the pdMat class to be used for the formulas in object. Defaults to "pdSymm" which corresponds to a general positive-definite matrix.
RML
an optional logical value. If TRUE, the associated mixed-effects model will be fitted using restricted maximum likelihood; else, if FALSE, maximum likelihood will be used. Defaults to FALSE.
data
an optional data frame in which to evaluate the variables used in the random effects formulas in object. It is used to obtain the levels for factors, which affect the dimensions and the row/column names of the underlying
##### Value

• an object inheriting from class reStruct, representing a random effects structure.

pdMat, lme, groupedData
library(nlme) data(Pixel) rs1 <- reStruct(list(Dog = ~day, Side = ~1), data = Pixel) rs1