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From |
Steve Samuels <sjsamuels@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: RE: calculating standard deviation of age at death from period life tables |

Date |
Tue, 9 Mar 2010 08:51:42 -0500 |

"Tricking" Stata's survival programs to accept age-period data, as recommended in the 2004 Statalist post, may be unnecessary. The user-written -lifetabl- command by Carlos Ramalheira ("findit lifetabl") will read a schedule of rates or of numerator & midyear denominator counts. This is a specialized area, so I recommend that consultation with a demographer, or at least a recent demography text. The example on German Rodriguez's Princeton page reproduces calculations from SH Preston, P Heuveline, and T Guillot (2000) Demography : Measuring and Modeling Population Processes, Wiley-Blackwell, NY. I do question whether SDs are a good summary for the variability in age at death, In most parametric survival models, SDs are parameters for the log of the time variable. On the original scale, SDs are usually increasing functions of the mean. -Steve On Mon, Mar 8, 2010 at 12:42 PM, Steve Samuels <sjsamuels@gmail.com> wrote: > Tony is on the right track. This requires a life-table solution. The > SD for age at death in period (or "current") life tables is that of > the ages at death for a synthetic cohort whose age-specific death > rates are those observed for the period, in this case 2004. This > calculation requires information about the numbers at risk in each age > during the year, not just about the numbers who died at each age. > > I've not constructed a period life table in Stata, but see: > > http://data.princeton.edu/eco572/periodlt.html > http://www.stata.com/statalist/archive/2004-02/msg00127.html > > Getting from these results to the SD will take some work: from the > table probabilities estimate the mean at death m; then estimate the > mean of (age -m)^2 > > -Steve > > > On Mon, Mar 8, 2010 at 11:57 AM, Lachenbruch, Peter > <Peter.Lachenbruch@oregonstate.edu> wrote: >> Am I missing something? Doesn't the Greenwood formula give this to you, and isn't it in the ltable command? Johannes Schoder wrote: >> I want to calculate the standard deviation of age at death from period >> life tables: >> So I know how many people died at age x, where x runs from 0,1,2...110: >> For example, in 2004 in the US people 2000 died at age 0, 1900 at age 1, >> 600 at age 2, etc. > -- Steven Samuels sjsamuels@gmail.com 18 Cantine's Island Saugerties NY 12477 USA 845-246-0774 * * 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: calculating standard deviation of age at death from period life tables***From:*Johannes Schoder <johannes.schoder@soi.uzh.ch>

**st: RE: RE: calculating standard deviation of age at death from period life tables***From:*"Lachenbruch, Peter" <Peter.Lachenbruch@oregonstate.edu>

**Re: st: RE: RE: calculating standard deviation of age at death from period life tables***From:*Steve Samuels <sjsamuels@gmail.com>

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