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From |
Tom Trikalinos <ttrikalin@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: How to write a fast code to obtain a specific calculation |

Date |
Wed, 18 Feb 2009 08:54:35 -0500 |

look into the non-linear equation estimation help nl On Tue, Feb 17, 2009 at 6:53 PM, Tiago V. Pereira <tiago.pereira@incor.usp.br> wrote: > Dear statalisters, > > I usually need to compute a value X that satifies a specific condition. > > A typical example is shown below. But this is only a single example, and > ordinarily I have similar, but more complex aims. > > Hence, I would like to know your expert opinion on how one can make codes > these kind of codes faster. Perhaps only Mata helps? > > > > In this example, I want to compute the value of tau^2 that imposes the > lower limit of my confidence interval to be 0. > > . > . > . > scalar lower_limit = 999999999 > while lower_limit>0 { > local tau2 = `tau2'+0.0001 > cap drop T_i V_i W_i WT > gene T_i= ln(_ES) > gene V_i = _selogES^2 > gene W_i = 1/(V_i+`tau2') > gene WT = W_i*T_i > qui summ WT > scalar sum_WT = r(sum) > qui sum W_i > scalar sum_W_i = r(sum) > scalar summary_random = sum_WT/sum_W_i > scalar lower_limit = summary_random-(1.96/sqrt(sum_W_i)) > } > > > Cheers! > > Tiago > > > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: How to write a fast code to obtain a specific calculation***From:*"Tiago V. Pereira" <tiago.pereira@incor.usp.br>

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