level.hlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{smcl}
{* 16mar2005}{...}
{cmd:help level}
{hline}

{title:Title}

{p2colset 5 18 20 2}{...}
{p2col :{hi:[R] level} {hline 2}}Set default confidence level{p_end}
{p2colreset}{...}


{title:Syntax}

{p 8 13 2}
{cmd:set} {opt l:evel} {it:#} [{cmd:,} {opt perm:anently}]


{title:Description}

{pstd}
{cmd:set} {cmd:level} specifies the default confidence level for confidence
intervals for all commands that report confidence intervals.  The initial
value is 95, meaning 95% confidence intervals.  {it:#} may be between 10.00
and 99.99, and {it:#} can have at most two digits after the decimal point.


{title:Option}

{phang}
{opt permanently} specifies that, in addition to making the change right now,
the {cmd:level} setting be remembered and become the default setting when you
invoke Stata.


{title:Remarks}

{pstd}
To change the level of confidence intervals reported by a particular command,
you need not reset the default confidence level.  All commands that report
confidence intervals have a {opt level(#)} option.  When you do not
specify the option, the confidence intervals are calculated for the default
level set by {cmd:set} {cmd:level} or for 95% if you have not reset it.


{title:Note concerning estimation commands}

{pstd}
All estimation commands can redisplay results when they are typed
without arguments; see {help estcom}.  The width of the reported confidence
intervals is a property of the display, not the estimation.  For example,

{phang2}{cmd:. regress mpg weight displ}{break}
        (output appears)

{phang2}{cmd:. regress, level(90)}{break}
       (output reappears, this time with 90% confidence intervals)


{title:Examples}

{phang}{cmd:. set level 90}

{phang}{cmd:. set level 99, permanently}


{title:Also see}

{psee}
Manual:  {bf:[R] level}

{psee}
Online:  {helpb ci}, {helpb creturn}, {helpb query}
{p_end}