{smcl}
{* 02oct2006}{...}
{hline}
help for {hi:acf}
{hline}

{title:Calculate and plot autocorrelation function for longitudinal data}

{p 8 27}
{cmdab:acf}
{it:varname}


{title:Description}

{p}If you have not read help for {help xt}, please do so now.

{p} {cmd:acf} calculates and plots the autocorrelation function for the
variable {it:varname} using the time variable in {help tis} and the id
variable {help iis}.  See Diggle, Liang and Zeger (1994, Ch.3).

{title:Options}

None.

{title:Remarks}

None.

{title:Author}

{p}
Paul Rathouz

{title:Also see}

{p 0 19}On-line:  help for {help xt}, {help ksm}, {help variogram}
{p_end}