## Stata 15 help for gr7hist

```
help gr7hist                                              (out-of-date command)
-------------------------------------------------------------------------------

Warning

This help file documents the old version of Stata's graph command.  See
graph for the modern version.

Stata runs the old version of graph whenever graph is invoked under
version control (see version) or when you use the graph7 or gr7 command.

Graph histograms (graph7, histogram command)

{graph7 | gr7} [variable] [weight] [if exp] [in range], histogram
[common_options bin(#) {freq | percent} normal[(#,#)]
density(#)]

common_options                                See help
------------------------------------------------------
title and axes options                        gr7axes
symbol and line options                       gr7sym
color and shading options                     gr7color
saving, printing, & multiple image options    gr7other
------------------------------------------------------

by is allowed; see by.

Description

graph7 ... , histogram ... specifies a histogram is to be drawn; this is
the default for graph7 when only one variable is specified and so the
histogram option is seldom typed.  For an introduction to graph7, see
graph7.

Options unique to histogram

bin(#) specifies the number of intervals to use for accumulating the
histogram.  The default is bin(5).

freq and percent affect how the vertical axis is labeled.  freq labels
the vertical axis in frequency rather than fractional units.  percent
labels the axis in percent.

normal[(#,#)] draws a normal density over the histogram.  normal by
itself will calculate and use the observed mean and standard
deviation.  normal(1,2) would overlay a normal with mean 1 and
standard deviation 2.

density(#) is used only with normal; it specifies the number of points
along the density to be calculated.  Default is density(100).

Examples

Since histogram is the default for graph7 with one variable

. graph7 x                  (draws a histogram of x)

. graph7 x, bin(11)         (uses 11 bins for histogram)

. graph7 x, normal(10,3)    (overdraws a normal mean 10 s.d. 3
density)

A more involved example:

. gr7 tempjuly, bin(9) log normal xlabel noxaxis yline ylabel
xline(58,100) t1("(Based on 956 U.S. Cities)") by(region) total

Also see

The eight graph7 types are specified as options.  The other seven types
are

Option       Graph type                    See help
----------------------------------------------------
twoway       Two-way scatterplot           gr7twoway
matrix       Two-way scatterplot matrix    gr7matrix
oneway       One-way scatterplot           gr7oneway
box          Box-and-whisker plot          gr7box
star         Star chart                    gr7star
bar          Bar chart                     gr7bar
pie          Pie chart                     gr7pie
----------------------------------------------------

Help:  [G-2] graph7, gr7axes, gr7color, gr7other, gr7sym; [R] cumul,
[R] histogram, [R] stem

```