# crosshair {mada}

### Description

Produces a crosshair plot or adds such a plot to an existing plot.

### Usage

## S3 method for class 'default': crosshair((x, correction = 0.5, level = 0.95, method = "wilson", xlim = c(0,1), ylim = c(0,1), length = 0.1, pch = 1, add = FALSE, suppress = TRUE, ...))

### Arguments

- x
- a data frame with variables including
`TP`

,`FN`

,`FP`

,`TN`

, alternatively a matrix with column names including these. - correction
- numeric, continuity correction applied to zero cells.
- level
- numeric, confidence level for the calculations of confidence intervals.
- method
- character, method used to calculate the confidence intervals for sensitivities, specificities and false positive rates. One of
`"wald"`

,`"wilson"`

,`"agresti-coull"`

,`"jeffreys"`

,`"modified wilson"`

,`"modified jeffreys"`

,`"clopper-pearson"`

,`"arcsine"`

,`"logit"`

,`"witting"`

- xlim
- part of ROC space to be plotted
- ylim
- part of ROC space to be plotted
- length
- length of "whiskers" of the crosshair.
- pch
- Symbol used to plot point estimates. Use
`pch = ""`

to suppress plotting point estimates. - add
- logical, should the plot be added to the current plot?
- suppress
- logical, should the warnings produced by the internal call to
`madad`

be suppressed? Defaults to`TRUE`

, since only the diagnostic accuracies and their confidence intervals are used in subsequent calculations. - ...
- further arguments passed on to
`plot`

.

### Details

Crosshair plots go back to Phillips et al. (2010). Note that for fits of the `reitsma`

function a crosshair method is available to plot pooled estimate, see `reitsma-class`

.

### Values

Besides plotting, the function returns an invisible `NULL`

.

### References

Phillips, B., Stewart, L.A., & Sutton, A.J. (2010). “'Cross hairs' plots for diagnostic meta-analysis.” *Research Synthesis Methods*, **1**, 308--315.

### See Also

`ROCellipse`

, `reitsma-class`

### Examples

data(AuditC) crosshair(AuditC)

Documentation reproduced from package mada, version 0.5.5. License: GPL-2