z*********o
发帖数: 541 | 1 第一题中是根据哪个公式从第二个式子到第一个式子的？
第二题如何从左边变成右边的，怎莫解释呢？
谢谢 | s**********l
发帖数: 629 | 2
I don't remember the definition of tPx:y, and I don't have the book with me.
But if you want to provide me with this definition, I can help. Otherwise
, for the middle part of the equation to the right hand side, it's easily
understood as the following:
25P25 x 25P50 = 50P25
think of it as one person, then it's all very very basic probabilities.
Remember that all Ps and Qs revolve back to basic probabilities learned in
Course P!
[Probability of a 25-year-old living for another 25 years, or
【在 z*********o 的大作中提到】
: 第一题中是根据哪个公式从第二个式子到第一个式子的？
: 第二题如何从左边变成右边的，怎莫解释呢？
: 谢谢
| G******y
发帖数: 1831 | 3 ft, 你太耐心了, 这个student问的东西太基本了，这些都需要自己看书弄懂
1. 需要independence condition, tPxy = tPx * tPy
2. That is a fundamental formula for survival, i.e., to survive n years,
the person needs to survive every single year，just multiplication rule
in probability theory
me.
Otherwise
【在 s**********l 的大作中提到】
:
: I don't remember the definition of tPx:y, and I don't have the book with me.
: But if you want to provide me with this definition, I can help. Otherwise
: , for the middle part of the equation to the right hand side, it's easily
: understood as the following:
: 25P25 x 25P50 = 50P25
: think of it as one person, then it's all very very basic probabilities.
: Remember that all Ps and Qs revolve back to basic probabilities learned in
: Course P!
: [Probability of a 25-year-old living for another 25 years, or
|
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