{p 4 8 12}{cmd:breaks(}{it:#}{cmd:)} specifies the number of unknown breaks under the alternative or the number of break points to be estimated. For hypothesis 2, {cmd:breaks()} can take two values, for example {cmd:breaks(4 6)} test for no breaks against 4-6 breaks. If only one value specified, then the lower limit is set to 1.{p_end} {p 4 8 12}{cmdab:breakc:onstant} break in constant. Default is no breaks in deterministics.{p_end} {p 4 8 12}{cmdab:breakf:ixedeffects} break in fixed effects. Default is no breaks in fixed effects.{p_end} {p 4 8 12}{cmdab:noconst:ant} suppresses constant in time series or pooled constant in panel model{p_end} {p 4 8 12}{cmdab:nofixed:effects} suppresses individual fixed effects (panel data only).{p_end} {p 4 8 12}{cmdab:nobreakvar:iables(}{it:varlist1}{cmd:)} defines variables with no structural break(s). {it:varlist1} can contain time series operators. {p_end} {p 4 8 12}{cmd:vce(type)} covariance matrix estimator, allowed: ssr, hac, hc and np. For more see,{help xtbreak##cov: covariance estimators}.{p_end} {p 4 8 12}{cmdab:trim:ming(}{it:real}{cmd:)} minimal segment length in percent. The minimal segment length is the minimal time periods between two breaks. The default is 15% (0.15). Critical values are available for %5, 10%, 15%, 20% and 25%.{p_end} {p 4 8 12}{cmd:error(}{it:real}{cmd:)} define error margin for partial break model.{p_end} {p 4 8 12}{cmd:csd} adds cross-section averages of variables with and without breaks.{p_end} {p 4 8 12}{cmd:csa({varlist})} and {cmd:csanobreak()} specify the variables with and without breaks which are added as cross-sectional averages. {cmd:xtbreak} calculates internally the cross-sectional averages.{p_end} {p 4 8 12}{cmdab:kf:actors(}{varlist}{cmd:)} (known factors) and {cmdab:nbkf:actors} (known factors without breaks) specify known factors which are constant across the cross-sectional dimension such as seasonal dummies or other observed common factors such as asset returns and oil prices with and without breaks. {p_end}