st: what does lambda mean after treatment regression?

[gjhxmu@sina.com]

<style id="sinamailpaperfilter">.sinamailpaper-0{cursor:text;}.sinamailpaper-0 td,.sinamailpaper-0 textarea,.sinamailpaper-0 input,.sinamailpaper-0 br,.sinamailpaper-0 div,.sinamailpaper-0 span{font-size:14px;font-family:"宋体",Verdana,Arial,Helvetica,sans-serif;line-height:1.5;}.sinamailpaper-0 p{*margin:0.2em auto;}.sinamailpaper-0 img{border:0;}.sinamailpaper-0 pre{white-space:normal;}.sinamailpaper-0 form{margin:0;}</style>&nbsp;Dear&nbsp;statalists,<BR><BR>I&nbsp;use&nbsp;-treatment-&nbsp;in&nbsp;the&nbsp;stata,and&nbsp;the&nbsp;resulting&nbsp;lambda&nbsp;is&nbsp;insignificant.<BR>What&nbsp;does&nbsp;it&nbsp;mean?&nbsp;Should&nbsp;I&nbsp;take&nbsp;the&nbsp;ols&nbsp;re 

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