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From |
wgould@stata.com (William Gould) |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: How many statistics can be bootstrapped by one program? |

Date |
Mon, 19 Aug 2002 08:05:36 -0500 |

Olena Stavrunova <ostavrun@blue.weeg.uiowa.edu> writes, > I need to bootstrap [...] 5 statistics [...]. [...] I have no luck in > obtaining bootstrap estimates for the number of statistics larger than 4. I > use the following program, which works fine for 4 statistics : > > program define jobflo > version 6.0 > [...] > end > > However, if I add one more statistic for calculation so that the program > looks like: > > program define jobflo1 > version 6.0 > [...] > local tf`i' = `gh`i'' - 'jk`i'' > [...] > post `1' `gh1998' `jk1998' `tf1998' `gh1999' `jk1999' `tf1998' > end There are two problems. The first is with the line > local tf`i' = `gh`i'' - 'jk`i'' ^ | should be `, not ' More important is how I found it, which was to run the program with -set trace on-. The second problem has not bitten Olena yet and perhaps it never will, but better to be safe. It concerns the line > post `1' `gh1998' `jk1998' `tf1998' `gh1999' `jk1999' `tf1998' I recommend Olena change the line to read, post `1' (`gh1998') (`jk1998') (`tf1998') (`gh1999') (`jk1999') (`tf1998') Stata 7 would require that line look like I have just retyped it, but Olena is using Stata 6 (or perhaps using Stata 7 in Stata-6 compatability mode). `gh1998', `jk1998', `tf1998', `gh1999', `jk1999', and `tf1998' are all macros, meaning each substitutes to the number itself. So, > post `1' `gh1998' `jk1998' `tf1998' `gh1999' `jk1999' `tf1998' might become > post `1' 12 15.2 -17 3.25 9.1 11.7 Note the negative 17 in the middle. -post- will think it sees > post `1' 12 (15.2-17) 3.25 9.1 11.7 and then complain that too few values were specified. This is avoided by binding each number in parentheses ourselves; post `1' (`gh1998') (`jk1998') (`tf1998') (`gh1999') (`jk1999') (`tf1998') becomes post `1' (12) (15.2) (-17) (3.25) (9.1) (11.7) and -post- cannot become confused. If Olena were using Stata 7, it would have forced her to use the safer syntax. -- Bill wgould@stata.com * * 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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