Stata 15 help for lroc

[R] lroc -- Compute area under ROC curve and graph the curve

Syntax

lroc [depvar] [if] [in] [weight] [, options]

options Description ------------------------------------------------------------------------- Main all compute area under ROC curve and graph curve for all observations nograph suppress graph

Advanced beta(matname) row vector containing model coefficients

Plot cline_options change look of the line marker_options change look of markers (color, size, etc.) marker_label_options add marker labels; change look or position

Reference line rlopts(cline_options) affect rendition of the reference line

Add plots addplot(plot) add other plots to the generated graph

Y axis, X axis, Titles, Legend, Overall twoway_options any options other than by() documented in [G-3] twoway_options ------------------------------------------------------------------------- fweights are allowed; see weight. lroc is not appropriate after the svy prefix.

Menu

Statistics > Binary outcomes > Postestimation > ROC curve after logistic/logit/probit/ivprobit

Description

lroc graphs the ROC curve and calculates the area under the curve.

lroc requires that the current estimation results be from logistic, logit, probit, or ivprobit.

Options

+------+ ----+ Main +-------------------------------------------------------------

all requests that the statistic be computed for all observations in the data, ignoring any if or in restrictions specified by the estimation command.

nograph suppresses graphical output.

+----------+ ----+ Advanced +---------------------------------------------------------

beta(matname) specifies a row vector containing model coefficients. The columns of the row vector must be labeled with the corresponding names of the independent variables in the data. The dependent variable depvar must be specified immediately after the command name. See Models other than the last fitted model in [R] lroc.

+------+ ----+ Plot +-------------------------------------------------------------

cline_options, marker_options, and marker_label_options affect the rendition of the ROC curve -- the plotted points connected by lines. These options affect the size and color of markers, whether and how the markers are labeled, and whether and how the points are connected; see [G-3] cline_options, [G-3] marker_options, and [G-3] marker_label_options.

+----------------+ ----+ Reference line +---------------------------------------------------

rlopts(cline_options) affects the rendition of the reference line; see [G-3] cline_options.

+-----------+ ----+ Add plots +--------------------------------------------------------

addplot(plot) provides a way to add other plots to the generated graph; see [G-3] addplot_option.

+-----------------------------------------+ ----+ Y axis, X axis, Titles, Legend, Overall +--------------------------

twoway_options are any of the options documented in [G-3] twoway_options, excluding by(). These include options for titling the graph (see [G-3] title_options) and for saving the graph to disk (see [G-3] saving_option).

Example

Setup . webuse lbw

Fit logistic regression to predict low birth weight . logistic low age lwt i.race smoke ptl ht ui

Graph ROC curve and calculate area under the curve . lroc

Stored results

lroc stores the following in r():

Scalars r(N) number of observations r(area) area under the ROC curve


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