mf_corr.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}
{* 28mar2005}{...}
{cmd:help mata corr()}
{hline}
{* index corr()}{...}
{* index correlation}{...}

{title:Title}

{p 4 4 2}
{bf:[M-5] corr() -- Make correlation matrix from variance matrix}


{title:Syntax}

{p 8 12 2}
{it:real matrix}
{cmd:corr(}{it:real matrix V}{cmd:)}

{p 8 12 2}
{it:void}{bind:      }
{cmd:_corr(}{it:real matrix V}{cmd:)}


{title:Description}

{p 4 4 2}
{cmd:corr(}{it:V}{cmd:)} returns the correlation matrix corresponding 
to variance matrix {it:V}.

{p 4 4 2}
{cmd:_corr(}{it:V}{cmd:)} changes the contents of {it:V} from being a 
variance matrix to being a correlation matrix.


{title:Remarks}

{p 4 4 2}
See function {cmd:variance()} in 
{bf:{help mf_mean:[M-5] mean()}}
for obtaining a variance matrix from data.


{title:Conformability}

    {cmd:corr(}{it:V}{cmd:)}{break}
	{it:input:}
		{it:V}:  {it:k x k}
	{it:output:}
	   {it:result}:  {it:k x k}

    {cmd:_corr(}{it:V}{cmd:)}{break}
	{it:input:}
		{it:V}:  {it:k x k}
	{it:output:}
		{it:V}:  {it:k x k}


{title:Diagnostics}

{p 4 4 2}
{cmd:corr()} and {cmd:_corr()} abort with error if {it:V} is not square.
{it:V} should also be symmetric, but this is not checked.


{title:Source code}

{p 4 4 2}
{view corr.mata, adopath asis:corr.mata},
{view _corr.mata, adopath asis:_corr.mata}


{title:Also see}

{p 4 13 2}
Manual:  {hi:[M-5] corr()}

{p 4 13 2}
Online:  help for 
{bf:{help mf_mean:[M-5] mean()}};
{bf:{help m4_stata:[M-4] stata}},
{bf:{help m4_statistical:[M-4] statistical}}
{p_end}