# F_2_panel.qqmathline

##### Useful panel function with qqmath

Useful panel function with qqmath. Draws a line passing through the points (usually) determined by the .25 and .75 quantiles of the sample and the theoretical distribution.

- Keywords
- dplot

##### Usage

```
panel.qqmathline(x, y = x,
distribution = qnorm,
probs = c(0.25, 0.75),
qtype = 7,
groups = NULL,
…,
identifier = "qqmathline")
```

##### Arguments

- x
The original sample, possibly reduced to a fewer number of quantiles, as determined by the

`f.value`

argument to`qqmath`

- y
an alias for

`x`

for backwards compatibility- distribution
quantile function for reference theoretical distribution.

- probs
numeric vector of length two, representing probabilities. Corresponding quantile pairs define the line drawn.

- qtype
the

`type`

of quantile computation used in`quantile`

- groups
optional grouping variable. If non-null, a line will be drawn for each group.

- …
other arguments.

- identifier
A character string that is prepended to the names of grobs that are created by this panel function.

##### See Also

*Documentation reproduced from package lattice, version 0.20-41, License: GPL (>= 2)*