# coefplot: Coefficient plots for Multivariate Linear Models In heplots: Visualizing Hypothesis Tests in Multivariate Linear Models

## Description

Displays confidence ellipses for all parameters in an multivariate linear model, for a given pair of variables. As such, it is a generalization of `confidenceEllipse`.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15``` ```coefplot(object, ...) ## S3 method for class 'mlm' coefplot(object, variables = 1:2, parm = NULL, df = NULL, level = 0.95, intercept = FALSE, Scheffe = FALSE, bars = TRUE, fill = FALSE, fill.alpha = 0.2, labels = !add, label.pos = NULL, xlab, ylab, xlim = NULL, ylim = NULL, axes = TRUE, main = "", add = FALSE, lwd = 1, lty = 1, pch = 19, col = palette(), cex = 2, cex.label = 1.5, lty.zero = 3, col.zero = 1, pch.zero = '+', verbose = FALSE, ...) ```

## Arguments

 `object` A multivariate linear model, such as fit by `lm()` `...` Other parameters passed to methods `variables` Response variables to plot, given as their indices or names `parm` Parameters to plot `df` Degrees of freedom for hypothesis tests `level` Confidence level `intercept` logical. Include the intercept? `Scheffe` If `TRUE`, confidence intervals for all parameters have Scheffe coverage, otherwise, individual coverage. `bars` Draw univariate confidence intervals for each of the variables? `fill` a logical value or vector. `TRUE` means the confidence ellipses will be filled. `fill.alpha` `labels` Labels for the confidence ellipses `label.pos` Positions of the labels for each ellipse. See `label.ellipse` `xlab, ylab` x, y axis labels `xlim, ylim` Axis limits `axes` Draw axes? `main` Plot title `add` logical. Add to an existing plot? `lwd` Line widths `lty` Line types `pch` Point symbols for the parameter estimates `col` Colors for the confidence ellipses, points, lines `cex` Character size for points showing parameter estimates `cex.label` Character size for ellipse labels `lty.zero, col.zero, pch.zero` Line type, color and point symbol for horizontal and vertical lines at 0, 0. `verbose` logical. Print parameter estimates and variance-covariance for each parameter?

## Value

Returns invisibly a list of the coordinates of the ellipses drawn

Michael Friendly

## See Also

`confidenceEllipse`, ~~~

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10``` ```mod <- lm(cbind(SAT,PPVT,Raven)~n+s+ns, data=Rohwer) coefplot(mod, lwd=2, main="Bivariate coefficient plot for SAT and PPVT", fill=TRUE) coefplot(mod, add=TRUE, Scheffe=TRUE, fill=TRUE) coefplot(mod, var=c(1,3)) mod1 <- lm(cbind(SAT,PPVT,Raven)~n+s+ns+na+ss, data=Rohwer) coefplot(mod1, lwd=2, fill=2 !=(1:5), main="Bivariate 68% coefficient plot for SAT and PPVT", level=0.68) ```

heplots documentation built on Oct. 7, 2021, 1:07 a.m.