swilk.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}
{* 27jan2005}{...}
{cmd:help swilk}, {cmd:help sfrancia}{right:dialogs:  {bf:{dialog swilk}}  {bf:{dialog sfrancia}}}
{hline}

{title:Title}

{p2colset 5 18 20 2}{...}
{p2col:{hi:[R] swilk} {hline 2}}Shapiro-Wilk and Shapiro-Francia tests for
normality{p_end}
{p2colreset}{...}


{title:Syntax}

{pstd}
Shapiro-Wilk normality test

{p 8 17 2}
{cmd:swilk}{space 4}{varlist} {ifin} [{cmd:,} {it:options}]

{pstd}
Shapiro-Francia normality test

{p 8 17 2}
{cmd:sfrancia} {varlist} {ifin}

{synoptset 20 tabbed}{...}
{synopthdr}
{synoptline}
{syntab:Main}
{synopt:{opth g:enerate(newvar)}}create {it:newvar} containing W test coefficients
{p_end}
{synopt:{opt l:nnormal}}test for three-parameter log normality
{p_end}
{synopt:{opt not:ies}}do not use average ranks for tied values
{p_end}
{synoptline}
{p2colreset}{...}
{p 4 6 2}
{opt by} may be used with {opt swilk} and {opt sfrancia}; see {helpb by}.


{title:Description}

{pstd}
{opt swilk} performs the Shapiro-Wilk W test for normality, and {opt sfrancia}
performs the Shapiro-Francia W' test for normality.  {opt swilk} can be used
with 7<=n<=2000 observations, and {opt sfrancia} can be used with with
5<=n<=5000 observations; see {helpb sktest} for a test allowing a larger
number of observations.


{title:Options}

{dlgtab:Main}

{phang}
{opth generate(newvar)} creates new variable {it:newvar} containing the W
test coefficients.

{phang}
{opt lnnormal} specifies that the test be for three-parameter
log normality, meaning ln(X-k) is tested for normality, where k is calculated
from the data as the value that makes the skewness coefficient zero.  When
simply testing ln(X) for normality, do not specify this option.  See
{helpb lnskew0} for estimation of k.

{phang}
{opt noties} suppresses use of averaged ranks for tied values when
calculating the W test coefficients.


{title:Examples}

    {cmd:. sfrancia chol}

    {cmd:. swilk chol}

    {cmd:. gen lchol = ln(chol)}
    {cmd:. swilk lchol}

    {cmd:. lnskew0 lcholk = chol}
    {cmd:. swilk lcholk, lnnormal}


{title:Also see}

{psee}
Manual:  {bf:[R] swilk}

{psee}
Online:  {helpb lnskew0}, {helpb lv}, {helpb sktest}
{p_end}