Demography is the statistical study of populations and their characteristics, such as births, deaths, migrations, consequences of changes, etc.
Questions tagged [demography]
82 questions
12
votes
5 answers
How can the fertility rate be below 2 but the number of births is greater than deaths (South Korea)?
I read an article published in 2020 which claimed that the South Korean population had declined "for the first time", the number of deaths (~300,000) outpacing births (~275,000). However, this would seem to be mathematically impossible because the…
Tyler Durden
- 320
4
votes
1 answer
How to account for the difference between the sexes in a mortality rate
I am trying to understand the statistical calculations described in a letter to a journal. It describes the annual mortality rate of patients currently being seen by a health clinic. To calculate the mortality rate two denominators are used: The…
4
votes
1 answer
Can someone explain homicide-related death rates?
If I see a statistic of homicide-related deaths per 100,000 is that per 100,000 deaths therefore giving an expected probability of death when dividing one by the other? or is it deaths by homicide per 100,000 people per period of time (like annually…
ajax2112
- 577
4
votes
0 answers
My fertility simulation is not matching reality
Using data from US vital statistics I created a simulation that was based on the number of children a woman has over her lifetime as follows (out of 10000):
0 4100
1 5800
2 8200
3 9380
4 9780
5 9900
6 9960
7 9985
8 9995
9 9998
10…
Tyler Durden
- 320
2
votes
1 answer
How can assumptions on TFR and life expectancy at birth be used in population projection?
I was reading a report on population projection using cohort component method. There the authors have only stated their assumptions regarding the TFR (total fertility rate) and life expectancy at birth (they are working with five year age groups).…
Blain Waan
- 3,595
1
vote
1 answer
Difference of death rate and probability of death
In the life table, two values are related to death. One is the death rate, by definition,
$$ m_x = \frac{d_x}{n_x}$$
Another one is the probability of dying:
$$ q_x = \frac{d_x}{l_x}$$
The numerator of these two formulas are the same, but the…
doraemon
- 208
1
vote
2 answers
What does "mean age at childbearing" mean?
I'm having trouble putting this into plain English.
According to the UN World Population Prospects glossary it means:
The mean age at childbearing is the mean age of mothers at the birth of their children if women were subject throughout their…
Tomulent
- 113
1
vote
1 answer
How to find 5-year survival probability of newborns from a life table?
I was trying to learn cohort component method for population projection from this link of the webpage of Measure Evaluation. To project the population forward using cohort component method, when the age groups are in 5-year intervals, we need 5-year…
Blain Waan
- 3,595
0
votes
1 answer
How to get the number of target audience?
I am currently working on a project, a sample start-up. Suppose I have these data:
$N$ = total population.
$n_1$ = number of mall shoppers.
$n_2$ = number of people aged from 18-65.
$n_3$ = number of people with smartphones.
The question is how do I…
ddwy
- 1