what is the definition of a model matrix what is meant by the matrix of the model how to make model matrix what is model matrix in regression which model can be used for a model that uses contrast how to create a matrix for a design which statement represents the contrast matrix used for calculating the parameters of the matrix? what is the design matrix difference between contrast matrix and design matrix what is the difference between a model matrix and contrast matrix what is contrast matrix why would you need a contrast matrix in a regression analysis what is the design of a matrix what is matrix contrast in java what is the comparison between the design matrix and the contrast matrix? define matrix of model what is the difference between a contrast matrix and a design matrix what is the purpose of a contrast matrix which of the following can be used to compute contrasts in linear regression model? how to make a matrix in regression analysis using contrast