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From Wikipedia

Dependency ratio

In economics and geography the dependency ratio is an age-population ratio of those typically not in the labor force (the dependent part) and those typically in the labor force (the productive part).


In published international statistics, the dependent part usually includes those under the age of 15 and over the age of 64. The productive part makes up the population in between, ages 15 – 64. It is normally expressed as a percentage:

(Total)\ Dependency\ ratio = \frac{(number\ of\ people\ aged\ 0\ to\ 14\ and\ those\ aged\ 65\ and\ over)} {number\ of\ people\ aged\ 15\to \ 64} \times 100

As the ratio increases there may be an increased burden on the productive part of the population to maintain the upbringing and pensions of the economically dependent. This results in direct impacts on financial expenditures on things like social security, as well as many indirect consequences.

The (total) dependency ratio can be decomposed into the child dependency ratio and the aged dependency ratio:

Child\ dependency\ ratio = \frac{number\ of\ people\ aged\ 0-14} {number\ of\ people\ aged\ 15-64} \times 100
Aged\ dependency\ ratio\ = \frac{number\ of\ people\ aged\ 65\ and\ over} {number\ of\ people\ aged\ 15-64} \times 100


The inverse of the dependency ratio, the inverse dependency ratio can be interpreted as how many independent workers have to provide for one dependent person (pension & expenditure on children)

From Yahoo Answers

Question:How do I calculate the accuracy of my ratio on this chemical formula ? the formula is 3ZnoH2 2 ZnC03 heat --> 5 Zn0 2 C02 3H20 My formula is 3 Zn0 2C0 H20 how do i calculate my accuracy of the product side? the formula is 3Zn(0H)2* 2 ZnC03 heat -- 5 Zn0+ 2 C02+ 3H20 ........My formula is 3 Zn0+ 2C0+ H20? the formula is 3Zn(0H)2* 2 ZnC03 heat -- 5 Zn0+ 2 C02+ 3H20 ........My formula is 3 Zn0+ 2C0+ H20?

Answers:Both equations are balanced. This is a combination of two reactions, and balancing can be done in many different ways. Zn(OH)2 -heat-> ZnO + H2O and ZnCO3 -heat-> ZnO + CO2

Question:What is the formula for % accuracy? Is it just 100% - % error?

Answers:[ (error - reference) / reference ] * 100 = % accuracy ~

Question:can anyone tell me?

Answers:100 * (estimate - actual)/actual = %error

Question:Please give me an example

Answers:One quick way is to find the square root of 2, store this number, clear the display, call the number back from memory and square it. On some calculators you'll get 1.99999998 (or something like that). I use the Golden Ratio: [1 + SQRT(5)] / 2 = 1.618034 store that while the number is still on the display, square it, then subtract it from the number in memory. The result should be exactly 1 (the Ancient Greeks knew this and they did not have calculators!) 2.618034... - 1.618034... = 1 (exactly) With the same number, do 1/x you should get 0.618034... which is exactly 1 less than the Golden Ratio. Some calculators do not give exactly 1.

From Youtube

Accuracy of Finite Difference Formulas for Differentiation Part 1 :Learn about the accuracy of the finite difference formulas for finding the derivative of a function.

Improving Excel Accuracy with the Evaluate Formula Tool :