RATES ( DEATH RATE) FOR STATISTICS GCE O LEVELS/IGCSE

RATIO

A ratio expresses the relation of a given kind of event to the occurrence of other events

Ratio= x/y or x:y

The important types of ratios are the death ratios, birth ratios, etc.

RATE

In mathematics, a rate is a ratio between two measurements, often with different. Source Wikipedia (Rate).

MORE ON RATES VISIT http://en.wikipedia.org/wiki/Rate_(mathematics)

CRUDE DEATH RATE

The crude death rate defined as a ratio of total deaths of some specific year to the total population in the same year, multiplied by 1000. It computed as follows;

CRUDE DEATH RATE= Deaths/Population x1000

AGE SPECIFIC DEATH RATE

When death rate is computed for some specific class or specific age group of a population, it is called age specific death rate. The kind of specificity must be stated.

STANDARD POPULATION

The standard population is that population which is selected to be the basis of comparison.

STANDARDIZED DEATH RATE

The crude death rates of two localities cannot be compared because death rates differ with a age, sex, climate, occupation, etc. To eliminate such effects, we compute what are standardized death rates.

SDR = Expected deaths in standard population/Total standard population x 1000