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studies, or indeed to any subject where you study a population which changes over time, and the members of the population move from one category to another (e.g., non-pregnant to pregnant for a birth control study, or from living to dead in the case of a life table). So what I am saying is that life table "methods" are general methods and may have many applications, just as you mentioned regarding the screwdriver above. However, life tables
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900:"Life contingencies" is a more general term than "life table methods", but since both of those are red links, I'm not sure where they are in Knowledge. I spend most of my time on WP on other interests, not insurance/reinsurance, although I may devote more time to it, since some of the content is biased towards specific areas of practice. There are many actuaries editing on WP, and I would direct the question to one of them, such as
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estimate future population, with decreases due to deaths and increases due to births, so it is a reasonable extension to the single-decrement life table, which is the most common type. Maybe that section could be expanded to include an example of a table using this parameter. Anyway, it clearly belongs in a way that the birth control topic did not.
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better-documented higher life expectency versions. Woods derives his model life tables from early twentieth-century
Chilean data, which may be recent, but not present. Other attempts have used Egyptian records, Ulpian's figures, etc. for adult mortality, with other estimates for child mortality. Saskia Hin goes over some of this in
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Life tables are (according to the article) used for insurance purposes (actuarial calculations), for some biology applications (population and actuarial calculations), and for some birth control applications. And nothing else. This is a very limited number of uses, I would say all of these uses are
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However, in relation to life tables, the "See also" section should be topics linked closely with life tables - not tangential topics. For example, would it be reasonable to include links to "Screwdriver" in each of the articles: Cars, Boats, Airplaces, Bicycles, Radios, Bookshleves, ... just because
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I'm actually a casualty actuary, not a life actuary, although our initial training is the same. Life contingencies includes the study of mortality, and using life tables, although to be very picky, it may be more restricted to the study of the time-value of money adjusted for mortality uncertainty.
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I think you are misunderstanding the distinction between "life table" and "life table methods". I don't think life tables are used in any way for birth control studies. However, the actuarial methods involved in the use of life tables would have general application to pregnancy and birth control
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An illustration of this error is the recent death of the last WWI veteran, who died at 110. His cohort faced not only two world wars, but the influenza epidemic, and a long stretch of time with no antibiotics. So, while the table indicates 1 living person at his age of death out of 100,000, he
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The table is actually a snapshot in of the present time. The prediction of life expectancy, Item 1 & 2, is predicated on conditions surrounding mortality remaining the same. Item 3, is simply wrong, as cumulative deaths, which is aggregated from cumulative survivors at a given age, actually
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An illustration of this error is the recent death of the last WWI veteran, who died at 110. His cohort faced not only two world wars, but the influenza epidemic, and a long stretch of time with no antibiotics. So, while the table indicates 1 living person at his age of death out of 100,000, he
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The table is actually a snapshot in of the present time. The prediction of life expectancy, Item 1 & 2, is predicated on conditions surrounding mortality remaining the same. Item 3, is simply wrong, as cumulative deaths, which is aggregated from cumulative survivors at a given age, actually
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Well, the additional parameter for progeny does go beyond the purpose of a life table as it is used in insurance, which is my area of expertise. I have to plead ignorance as to how these tables are used by biologists, but a multi-parameter table involving progeny could be used in demographics to
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Life tables are important in historical demography, too, and this isn't always directly derived from present populations. For example, Coale and Demeny derive some of their model life tables from recent data, but derive the lower life expectancy versions from mathematical adjustment to the
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As it turns out, since life table techniques are used in birth control studies, there is indeed a link. And in that light I would be happy to put wikilinks around Pearl Index and Birth
Control (which I will do in a minute). The link is then there for the reader to follow.
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It would be helpful if someone could explain all of the columns in the CDC Table 1., since that is presented as a model life table. Specifically I mean L(x) and T(x)dealing with person-years lived. I would try but don't know how to use math notation on
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are the sum of deaths at each period. They vary by all the conditions that affect mortality such as disease, nutrition and wars. These have varied over the course of the lifetimes listed, so the proportion of survivors at a given age is incorrect.
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are the sum of deaths at each period. They vary by all the conditions that affect mortality such as disease, nutrition and wars. These have varied over the course of the lifetimes listed, so the proportion of survivors at a given age is incorrect.
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is in the category of birth control, why not life table? I realize life tables are used for other purposes, too, while the Pearl Index is limited to birth control, but that's why articles are allowed to have multiple categories, right?
1074:. Projected life tables anticipate to the (most likely) evolution of human mortality. They have 2 entries: age and calendar year. For each age, the probability of dying at that particular age, during a particular year, t, is given by
925:'s page, he is a retired life actuary and would likely be able to give you even better guidance. There really is no good article for "life table methods" now, that is something that would be in a lifecon article. Maybe something in
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You are right - I had not realized the distintion between life tables and life table methods. Does this apply to the biology section also, as that seems to be talking about birth rates as well as death rates/life expectancies?
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1-the probability of surviving any particular year of age 2-remaining life expectancy for people at different ages 3-the proportion of the original birth cohort still alive 4-estimates of a cohort's longevity characteristics.
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Hi there - I can see your concern, but let's look for a moment at what is going through a reader's mind when they are looking at the Life Tables article: they are reading about life tables, and related topics.
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The current categories are insurance, population, and actuarial science. It looks to me like one is missing. I fail to see how 'population' is linked closely to life tables, while 'birth control' is not.
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I admit to not following all that, but I will defer to your greater knowledge. I would like to have discussion of the life-table methods used for birth control studies somewhere, however - would the
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than in more anthropic fields though. I suppose the subject should probably have its own article? (it's either that or cover them here and/or in the population ecology article itself)
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Survivorship curves are closely related to life tables, being more or less a graphical form of them. They seem to be used more exclusively in
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Can someone who is competent in this subject put in a brief explanation of the distinction between a period table and a cohort table?
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When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
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to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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was the only one who made it out of 2,000,000 troops of that war. This is consistent with my premise above.
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was the only one who made it out of 2,000,000 troops of that war. This is consistent with my premise above.
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There exists another type of life table, i.e. projected life tables. Farily recent development. See e.g.
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If you have discovered URLs which were erroneously considered dead by the bot, you can report them with
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Statistics of life expectancies; used as basis for life insurance costs.
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they use screwdrivers in manufacture & maintenance? I think not.
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Period, Cohort AND Projected (= Dynamic)(= Prospective) Life Tables
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for additional information. I made the following changes:
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3-the proportion of the original birth cohort still alive
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4 listed aspects of life tables (as follows) have errors:
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4-estimates of a cohort's longevity characteristics.
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