{smcl}
{* 2007-02-26}{...}
{cmd:help ajv} {right:Version 1.1 2007-02-26}
{hline}

{title:Title}

{p2colset 5 12 12 2}{...}
{p2col:{hi:ajv} {hline 2}}Generate a random variate following a Johnson distribution{p_end}
{p2colreset}{...}


{title:Syntax}

{p 8 17 2}
{cmd:ajv}
[{varname}]
{ifin}
{cmd:,} {cmdab:di:stribution(}{it:SN}|{it:SL}|{it:SU}|{it:SB}{cmd:)} 
  {cmdab:g:enerate(}{it:newvar}{cmd:)} {cmdab:ga:mma(}{it:#}{cmd:)} {cmdab:de:lta(}{it:#}{cmd:)} [{it:options}]

{synoptset 20 tabbed}{...}
{synopthdr}
{synoptline}
{syntab:Main}
{synopt:{opt l:ambda(#)}}value for {it:lambda}; defaults to one{p_end}
{synopt:{opt x:i(#)}}value for {it:xi}; defaults to zero{p_end}
{synopt:{opt seed(#)}}seed for random number generator{p_end}
{synopt:{opt n(#)}}set number of observations{p_end}
{synoptline}
{p2colreset}{...}


{title:Description}

{pstd}
{cmd:ajv} generates a random variable {newvar} that follows one of the Johnson distributions, SN, SL, SU or SB.  Parameters
{it:gamma}, {it:delta}, {it:lambda} and {it:xi} are such as those obtained from {help jnsn}.  If {varname} is specified, then
it will be used as a standard normal deviate and {newvar} will be generated from it and the Johnson distribution 
parameters.  If no {varname} is specified, then {cmd:ajv} will internally generate a standard normal variate using the 
{cmd:seed()} if one is specified.  


{title:Options}

{dlgtab:Main}

{phang}
{cmd:distribution} specifies the Johnson distribution; it may be in upper, lower or mixed case.

{phang}
{cmd:generate} names the new variable.

{phang}
{cmd:gamma}
{cmd:delta}
{cmd:lambda}
{cmd:xi} specify parameters of the Johnson distribution.

{phang}
{cmd: seed} sets the seed for random number generation, e.g., when {varname} is not specified.

{phang}
{cmd: n} specifies the number of observations, e.g., starting from an empty dataset.


{title:Remarks}

{pstd}
{cmd:ajv} is an implementation of {it:Algorithm AS 100.1} (Hill, 1976).


{title:References}

{pstd}
I. D. Hill, Normal-Johnson and Johnson-Normal transformations. {it:Applied Statistics} {bf:25}:190{c 150}92, 1976.


{title:Examples}

{phang}{cmd:. ajv snv, distribution(sl) generate(lnv) gamma(1) delta(1)}

{phang}{cmd:. ajv , distribution(su) generate(suv) gamma(1) delta(1) seed(12345) n(100)}


{title:Author}

{pstd}
Joseph Coveney
jcoveney@bigplanet.com


{title:Also see}


{psee}
Online:  {helpb jnsn}, {helpb jnsw}, {helpb generate}