{smcl}
{* 15nov2018}{...}
{cmd:help trajstart}
{marker s_Description}
{title:Description}

{p 4 4 6}{cmd:trajstart}: generate random start values for traj{p_end}

{p 4 4 6}(NOTE: trajstart does not currently work with the joint trajectory model){p_end}

{title:Examples}

    1:{help trajstart##s_1:  Multi-trajectory model}               
    2.{help trajstart##s_2:  Censored Normal Model with Risk}                 
{hline}
{marker s_Syntax}
{title:Syntax}

{p 6 8 6}
{cmdab:trajstart} {cmd:, start(}{help matrix:{it:matrix}}{cmd:) sigma(#) groups(#) risk} {p_end} 
{synoptset 20 tabbed}{...}
{synopthdr}
{synoptline}
{syntab:Trajectory Variables}
{synopt :{opt start(matrix)}}name of the matrix with the initial start values to be changed{p_end}
{synopt :{opt sigma(#)}}amount of variability for the new random start values{p_end}
{synopt :{opt groups(#)}}number of groups in the traj model (not required with risk option){p_end}
{synopt :{opt risk}}optional to specify that the traj model includes risk variables{p_end}

{hline}
{marker s_1}
{title:Example 1: Multi-Trajectory Model}

{p 4 10 8}{stata "use http://www.andrew.cmu.edu/user/bjones/traj/data/montreal_sim.dta, clear"}{p_end}

{p 4 10 8}{stata "traj, multgroups(3) var1(qcp84op-qcp91op) indep1(age1-age5) model1(cnorm) max1(10) order1(2 2 2) var2(qas*det) indep2(age3-age7) model2(zip) order2(2 0 3) detail"}{p_end}

{p 4 10 8}{stata "mat sv = -.73, 0, 0, .99, 0, 0, 2.71, 0, 0, 1.72, -3, 0, 0, -.22, .85, 0, 0, 0, 33.3, 33.3, 33.3"}{p_end}

{p 4 10 8}{stata `"trajstart, start(sv) sigma(.002) groups(3)"'}{p_end}

{p 4 10 8}{stata `"mat A = r(trajstart)"'}{p_end}

{p 4 10 8}{stata `"mat list A, format(%8.3f)"'}{p_end}

{p 4 10 8}{stata "traj, multgroups(3) var1(qcp84op-qcp91op) indep1(age1-age5) model1(cnorm) max1(10) order1(2 2 2) var2(qas*det) indep2(age3-age7) model2(zip) order2(2 0 3) start(A) detail"}{p_end}

{marker s_2}
{title:Example 2: Censored Normal Model with Risk}

{p 4 10 8}{stata "use http://www.andrew.cmu.edu/user/bjones/traj/data/montreal_sim.dta, clear"}{p_end}

{p 4 10 8}{stata "traj, var(qcp*op) indep(age*) model(cnorm) min(0) max(10) order(1 3 2) risk(scolmer scolper) detail"}{p_end}

{p 4 10 8}{stata "mat sv = -.24, 0, 2.24, 0, 0, 0, 4.72, 0, 0, 2.48, 0, 0, 0, 0, 0, 0"}{p_end}

{p 4 10 8}{stata `"trajstart, start(sv) sigma(.01) risk"'}{p_end}

{p 4 10 8}{stata `"mat A = r(trajstart)"'}{p_end}

{p 4 10 8}{stata `"mat list A, format(%8.3f)"'}{p_end}

{p 4 10 8}{stata "traj, var(qcp*op) indep(age*) model(cnorm) min(0) max(10) order(1 3 2) risk(scolmer scolper) start(A) detail"}{p_end}

{hline}

{marker saved_results}{...}
{title:Saved results}

{pstd}
{cmd:trajstart} saves the following in {cmd:r()}:

{synoptset 19 tabbed}{...}
{p2col 5 19 23 2: Matrices}{p_end}
{synopt:{cmd:r(trajstart)}}start vector{p_end}

{hline}

{title:Author}

{p 4 4 6}Bobby L. Jones{p_end}
{p 4 4 6}bjones@andrew.cmu.edu{p_end}

{title:Web-page}

{p 4 4 6} {browse "http://www.andrew.cmu.edu/user/bjones/"} {p_end}

{smcl}