Crude Birth Rate is how many live children are born. Crude death rate is how many people die. Crude death minus crude birth is the net gain (or loss) and is called the birth rate. It represents whether or not deceased people are "replaced".
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Death Rate is the actual rate of death where Crude Death Rate is a guess on the death rate.
Crude rates are rates calculated and applied for the entire population disregarding any categories such as gender or age. E.g. crude birth rate calculates the total number of births in a year over the total population including men, women and all children (provided they were not born that year).Specific rates are rates calculated considering categories or subgroups. E.g. birth rate calculates the total number of births in a year over the total number of women of child-bearing age.
There is no difference between them they are same rate constant is another name of specific rate constant
the birth rate is the rate of birth in a population, the death rate is the number of deaths in a population and the growth rate is the growing numbers of the population.
mortality rate - death rate