twoway_pcspike.hlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{smcl}
{* 08apr2005}{...}
{cmd:help twoway pcspike}{right:dialogs:  {dialog twoway_overlay:overlaid twoway}{space 0}}
	{right:{dialog twoway_simple:single twoway}{space 2}}
{hline}

{title:Title}

{p2colset 5 33 35 2}{...}
{p2col :{hi:[G] graph twoway pcspike} {hline 2}}Paired-coordinate plot with spikes{p_end}
{p2colreset}{...}
{* index twoway pcspike tt}{...}
{* index paired-coordinate plots, pcspike}{...}


{title:Syntax}

{p 8 60 2}
{cmdab:tw:oway}
{cmd:pcspike}
{it:y1var} {it:x1var} {it:y2var} {it:x2var}
{ifin}
[{cmd:,}
{it:options}]


{p2colset 9 32 34 2}{...}
{p2col:{it:options}}description{p_end}
{p2line}
INCLUDE help gr_blspike2

INCLUDE help gr_hvpcopt
INCLUDE help gr_axlnk

INCLUDE help gr_twopt
{p2line}
{pin}
All explicit options are {it:rightmost}, except {cmd:vertical}
and {cmd:horizontal}, which are {it:unique}; see {help repeated options}.


{title:Description}

{pstd}
A paired-coordinate spike plot draws a spike (or line) for each observation in
the dataset.  The line starts at the coordinate ({it:y1var},{it:x1var}) and
ends at the coordinate ({it:y2var},{it:x2var}).


{title:Options}

INCLUDE help gr_blspikef2

INCLUDE help gr_hvpcoptf

INCLUDE help gr_axlnkf

INCLUDE help gr_twoptf


{title:Remarks}

{pstd}
Remarks are presented under the headings

	{help twoway_pcspike##basic_use:Basic use}
	{help twoway_pcspike##advanced_use:Advanced use}
	{help twoway_pcspike##advanced_use2:Advanced use 2}

{marker basic_use}{...}
{title:Basic use}

{pstd}
We have longitudinal data from 1968 and 1988 on the earnings and total
experience of US women by occupation.

	{cmd:. sysuse nlswide1, clear}

	{cmd:. list occ wage68 ttl_exp68 wage88 ttl_exp88}
{txt}
	     {c TLC}{hline 15}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c TRC}
	     {c |} {res}          occ     wage68   ttl_e~68     wage88   ttl_e~88 {txt}{c |}
	     {c LT}{hline 15}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c RT}
	  1. {c |} {res}Professionals   6.121874    .860618   10.94776   14.11177 {txt}{c |}
	  2. {c |} {res}     Managers   5.426208   1.354167   11.53928   13.88886 {txt}{c |}
	  3. {c |} {res}        Sales   4.836701   .9896552   7.290306   12.62823 {txt}{c |}
	  4. {c |} {res}     Clerical   4.088309    .640812   9.612672   11.08019 {txt}{c |}
	  5. {c |} {res}    Craftsmen   4.721373   1.091346   7.839769   12.64364 {txt}{c |}
	     {c LT}{hline 15}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c RT}
	  6. {c |} {res}   Operatives   4.364782   .7959284   5.893025   11.99362 {txt}{c |}
	  7. {c |} {res}    Transport   1.987857   .5247414   3.200494   8.710394 {txt}{c |}
	  8. {c |} {res}     Laborers   3.724821    .775966   5.264415   10.56182 {txt}{c |}
	  9. {c |} {res}        Other    5.58524   .8278245   8.628641   12.78389 {txt}{c |}
	     {c BLC}{hline 15}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c -}{hline 10}{c BRC}
{txt}

{pstd}
We graph a spike showing the movement from 1968 values to 1988 values for each
observation (each occupation):

	{cmd:. twoway pcspike wage68 ttl_exp68 wage88 ttl_exp88}
	  {it:({stata "gr_example nlswide1: twoway pcspike wage68 ttl_exp68 wage88 ttl_exp88":click to run})}
{* graph gtpcspike1}{...}


{marker advanced_use}{...}
{title:Advanced use}

{pstd}
{cmd:twoway} {cmd:pcspike} can be usefully combined
with other {cmd:twoway} plottypes.  Here we add markers and labeled markers
along with titles and such to improve the graph:

{cmd}{...}
	. twoway pcspike wage68 ttl_exp68 wage88 ttl_exp88	||
		 scatter wage68 ttl_exp68, msym(O)		||
		 scatter wage88 ttl_exp88, msym(O) pstyle(p4)
		 mlabel(occ) xscale(range(17))
		 title("Change in US Women's Experience and Earnings")
		 subtitle("By Occupation -- 1968 to 1988")
		 ytitle(Earnings) xtitle(Total experience)
		 note("Source: National Longitudinal Survey of Young Women")
		 legend(order(2 "1968" 3 "1988"))
{txt}{...}
	  {it:({stata "gr_example2 twopcspike1":click to run})}
{* graph gtpcspike2}{...}


{marker advanced_use2}{...}
{title:Advanced use 2}

{pstd}
Drawing the edges of network diagrams is often easier with 
{cmd:twoway pcspike} than with other plottypes. 

	{cmd:. sysuse network1}

	{cmd:. twoway pcspike y_c x_c y_l x_l}
	  {it:({stata "gr_example network1: twoway pcspike y_c x_c y_l x_l":click to run})}
{* graph gtpcspike3}{...}

{pstd}
As with our first example, this graph can be made prettier by combining 
{cmd:twoway pcspike} with other plottypes.  

{cmd}{...}
	. sysuse network1a

	. twoway pcspike y_c x_c y_l x_l, pstyle(p3)		    ||
		 pcspike y_c x_c y_r x_r, pstyle(p4)		    ||
		 scatter y_l x_l, pstyle(p3) msize(vlarge) msym(O)
				  mlabel(lab_l) mlabpos(9)	    ||
		 scatter y_c x_c, pstyle(p5) msize(vlarge) msym(O)  ||
		 scatter y_r x_r, pstyle(p4) msize(vlarge) msym(O)
				  mlabel(lab_r) mlabpos(3)
	       yscale(off) xscale(off) ylabels(, nogrid) legend(off)
	       plotregion(margin(30 15 3 3))
{txt}{...}
	  {it:({stata "gr_example2 twopcspike2":click to run})}
{* graph gtpcspike4}{...}


{title:Also see}

{psee}
Manual:  {bf:[G] graph twoway pcspike}

{psee}
Online:  
{helpb twoway};
{helpb twoway line};
{helpb twoway rspike};
{helpb twoway pccapsym},
{helpb twoway pcarrow},
{helpb twoway pcbarrow},
{helpb twoway pcscatter},
{helpb twoway pci}
{p_end}