Xyplot, Densityplot, and Pairs plot methods for a mixed-effects model profile.

`xyplot()`

draws “zeta diagrams”, also visualizing
confidence intervals and their asymmetry.

`densityplot()`

draws the profile densities.

`splom()`

draws profile pairs plots. Contours are for the
marginal two-dimensional regions (i.e. using df = 2).

```
# S3 method for thpr
xyplot(x, data = NULL,
levels = sqrt(qchisq(pmax.int(0, pmin.int(1, conf)), df = 1)),
conf = c(50, 80, 90, 95, 99)/100,
absVal = FALSE, scales=NULL,
which = 1:nptot, ...)
```# S3 method for thpr
densityplot(x, data, npts = 201, upper = 0.999, ...)

# S3 method for thpr
splom(x, data,
levels = sqrt(qchisq(pmax.int(0, pmin.int(1, conf)), 2)),
conf = c(50, 80, 90, 95, 99)/100, which = 1:nptot,
draw.lower = TRUE, draw.upper = TRUE, ...)

- xyplot:
a density plot, a

`"trellis"`

object (lattice package) which when`print()`

ed produces plots on the current graphic device.- densityplot:
a density plot, a

`"trellis"`

object, see above.- splom:
a pairs plot, aka

**s**catter**plo**t**m**atrix, a`"trellis"`

object, see above.

- x
a mixed-effects profile, i.e., of class

`"thpr"`

, typically resulting from`profile(fm)`

where`fm`

is a fitted model from`lmer`

(or its generalizations).- data
unused - only for compatibility with generic.

- npts
the number of points to use for the

`densityplot()`

.- upper
a number in \((0,1)\) to specify upper (and lower) boundaries as

`+/- qnorm(upper)`

.- levels
the contour levels to be shown; usually derived from

`conf`

.- conf
numeric vector of confidence levels to be shown as contours.

- absVal
logical indicating if

`abs(.)`

olute values should be plotted, often preferred for confidence interval visualization.- scales
plotting options to be passed to

`xyplot`

- which
integer or character vector indicating which parameters to profile: default is all parameters (see

`profile-methods`

for details).- draw.lower
(logical) draw lower-triangle (zeta scale) panels?

- draw.upper
(logical) draw upper-triangle (standard dev/cor scale) panels?

- ...
further arguments passed to

`xyplot`

,`densityplot`

, or`splom`

from package lattice, respectively.

`profile`

, notably for an
example.

```
## see example("profile.merMod")
```

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