Stata 15 help for qnorm

[R] diagnostic plots -- Distributional diagnostic plots

Syntax

Symmetry plot

symplot varname [if] [in] [, options1]

Ordered values of varname against quantiles of uniform distribution

quantile varname [if] [in] [, options1]

Quantiles of varname1 against quantiles of varname2

qqplot varname1 varname2 [if] [in] [, options1]

Quantiles of varname against quantiles of normal distribution

qnorm varname [if] [in] [, options2]

Standardized normal probability plot

pnorm varname [if] [in] [, options2]

Quantiles of varname against quantiles of chi-squared distribution

qchi varname [if] [in] [, options3]

Chi-squared probability plot

pchi varname [if] [in] [, options3]

options1 Description ------------------------------------------------------------------------- Plot 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 -------------------------------------------------------------------------

options2 Description ------------------------------------------------------------------------- Main grid add grid lines

Plot 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 -------------------------------------------------------------------------

options3 Description ------------------------------------------------------------------------- Main grid add grid lines df(#) degrees of freedom of chi-squared distribution; default is df(1)

Plot 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 -------------------------------------------------------------------------

Menu

symplot

Statistics > Summaries, tables, and tests > Distributional plots and tests > Symmetry plot

quantile

Statistics > Summaries, tables, and tests > Distributional plots and tests > Quantiles plot

qqplot

Statistics > Summaries, tables, and tests > Distributional plots and tests > Quantile-quantile plot

qnorm

Statistics > Summaries, tables, and tests > Distributional plots and tests > Normal quantile plot

pnorm

Statistics > Summaries, tables, and tests > Distributional plots and tests > Normal probability plot, standardized

qchi

Statistics > Summaries, tables, and tests > Distributional plots and tests > Chi-squared quantile plot

pchi

Statistics > Summaries, tables, and tests > Distributional plots and tests > Chi-squared probability plot

Description

symplot graphs a symmetry plot of varname.

quantile plots the ordered values of varname against the quantiles of a uniform distribution.

qqplot plots the quantiles of varname1 against the quantiles of varname2 (Q-Q plot).

qnorm plots the quantiles of varname against the quantiles of the normal distribution (Q-Q plot).

pnorm graphs a standardized normal probability plot (P-P plot).

qchi plots the quantiles of varname against the quantiles of a chi-squared distribution (Q-Q plot).

pchi graphs a chi-squared probability plot (P-P plot).

See [R] regress postestimation diagnostic plots for regression diagnostic plots and [R] logistic postestimation for logistic regression diagnostic plots.

Options for symplot, quantile, and qqplot

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

marker_options affect the rendition of markers drawn at the plotted points, including their shape, size, color, and outline; see [G-3] marker_options.

marker_label_options specify if and how the markers are to be labeled; see [G-3] marker_label_options.

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

rlopts(cline_options) affect 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).

Options for qnorm and pnorm

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

grid adds grid lines at the 0.05, 0.10, 0.25, 0.50, 0.75, 0.90, and 0.95 quantiles when specified with qnorm. With pnorm, grid is equivalent to yline(.25, .5, .75) xline(.25, .5, .75).

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

marker_options affect the rendition of markers drawn at the plotted points, including their shape, size, color, and outline; see [G-3] marker_options.

marker_label_options specify if and how the markers are to be labeled; see [G-3] marker_label_options.

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

rlopts(cline_options) affect 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).

Options for qchi and pchi

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

grid adds grid lines at the 0.05, 0.10, 0.25, 0.50, 0.75, 0.90, and 0.95 quantiles when specified with qchi. With pchi, grid is equivalent to yline(.25, .5, .75) xline(.25, .5, .75).

df(#) specifies the degrees of freedom of the chi-squared distribution. The default is df(1).

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

marker_options affect the rendition of markers drawn at the plotted points, including their shape, size, color, and outline; see [G-3] marker_options.

marker_label_options specify if and how the markers are to be labeled; see [G-3] marker_label_options.

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

rlopts(cline_options) affect 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).

Examples

Setup . sysuse auto

Symmetry plot of price . symplot price

Ordered values of price against quantiles of uniform distribution . quantile price

Quantiles of weightd against quantiles of weightf . generate weightd=weight if !foreign . generate weightf=weight if foreign . qqplot weightd weightf

Quantiles of price against quantiles of normal distribution . qnorm price . qnorm price, grid (add a grid background)

Standardized normal probability plot of price . pnorm price . pnorm price, grid (add a grid background)

Quantiles of ch against quantiles of chi-squared distribution . egen c1 = std(price) . egen c2 = std(mpg) . generate ch = c1^2 + c2^2 . qchi ch, df(2) grid

Chi-squared probability plot . pchi ch, df(2) grid


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