{smcl} {cmd:help chowtest}{right: (version 2011-August-23)} {hline} {title:Title} {p2colset 3 15 20 2}{...} {p2col:{hi: chowtest} {hline 2}} Chow test for structure break {p_end} {p2colreset}{...} {title:Syntax} {p 4 19 2} {cmdab:chowtest} {varlist} {ifin}, {cmdab:g:roup:}{cmd:(varname)} [ {cmdab:r:estrict:}{cmd:(varlist)} {opt h:et} {opt d:etail} ] {synoptset 24 tabbed}{...} {synopthdr} {synoptline} {synopt :{opt g:roup(varname)}}specify the group variable{p_end} {synopt :{opt r:estrict}}independents which are restriced to have constant coefficients {p_end} {synopt :{opt h:et}}heteroskedasticy {p_end} {synopt :{opt d:etail}}display regression result {p_end} {synoptline} {p2colreset}{...} {p 4 6 2}{varlist} are dependent variable and unrestriced independent variables.{p_end} {title:Example} {result}{dlgtab:The auto.dta data}{text} {phang2}{inp:.} {stata "sysuse auto,clear":sysuse auto,clear}{p_end} {phang2}{inp:.} {stata "chowtest price wei mpg, group(foreign)":chowtest price wei mpg, group(foreign)}{p_end} {phang2}{inp:.} {stata "chowtest price wei mpg, group(foreign) restrict(headroom)":chowtest price wei mpg, group(foreign) restrict(headroom)}{p_end} {phang2}{inp:.} {stata "chowtest price wei mpg, group(foreign) het":chowtest price wei mpg, group(foreign) het }{p_end} {title:Acknowledgements} {pstd} Thanks for helpul suggestions of Lian Yujun in Sun Yat-sen University ({browse "mailto:arlionn@163.com":arlionn@163.com}, {browse "http://www.peixun.net/author/3.html":http://www.peixun.net/author/3.html}). {p_end} {title:Author} {pstd} {cmd:Qunyong, Wang,} Institute of Statistics and Econometrics, Nankai University.{break} E-mail: {browse "mailto:QunyongWang@outlook.com":QunyongWang@outlook.com}. {break} Homepage: {browse "http://economics.nankai.edu.cn/level2/ProfileTeacherInfo.aspx?id=229":http://economics.nankai.edu.cn/level2/ProfileTeacherInfo.aspx?id=229}. {break} {p_end}