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From |
"Joseph Coveney" <jcoveney@bigplanet.com> |

To |
"Statalist" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: bootstrap command help |

Date |
Sun, 13 Apr 2008 17:32:48 +0900 |

Swati Misra wrote: I needed help on command of bootstrap to run the bootstrap on 2 continuous variables at a time. I was successful in running the 1000 replications to bootstrap 1 variable at a time and the command I used was as follows: [redacted] Please let me know how to run bootstrap for 2 variables simultaneously. -------------------------------------------------------------------------------- Have -bootstrap- call a program that you write that does what you want. You'll need to collect the various statistics in a matrix in order to pass them out of the called program into -bootstrap-. Pass the matrix into and out of the called program in an argument list (option); I don't think that you can reference an element of a return matrix in-line in an expression list, i.e., you cannot do: -bootstrap (price: mean = r(S[1,1]) sd = r(S[1,2]) . . . - Joseph Coveney clear * set more off * program define summaries version 10 syntax varlist , container(name) tempname R foreach var of local varlist { quietly summarize `var', detail matrix define `R' = nullmat(`R') \ ( r(mean), r(p50), r(sd), /// r(p75) - r(p25), r(max) - r(min) ) } matrix colnames `R' = mean median sd iqr range matrix rownames `R' = `varlist' matrix define `container' = `R' end * tempname A sysuse auto set seed `=date("2008-04-13", "YMD")' bootstrap (price: mean = `A'[1,1] median = `A'[1,2] sd = `A'[1,3] /// iqr = `A'[1,4] range = `A'[1,5]) (mpg: mean=`A'[2,1] /// median=`A'[2,2] sd = `A'[2,3] iqr = `A'[2,4] /// range = `A'[2,5]): summaries price mpg, container(`A') matrix drop `A' exit * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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