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Nitwit
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gross reproductive rate
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10.17.05 (3 years ago)
#1
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Q.If the gross reprodcutive rate of a community is 3.3 then the birth rate is-
1.200/1000
2.25/1000
3.40/1000
4.50/1000
ans. 3
plz kindly explain
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swagatamb
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11.13.05 (3 years ago)
#2
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as per the method of answering given in this other post,
"The definition of eligible couples says the female is in reproductive age group (15 - 45 years). So each couple has around 30 years of reproduction".....with 3.3 GIRLS (it's GRR) per year. if sex ratio is 1000 females per 1000 males, that is equal to 6.6 children in 30 years, or .22 children per year. multiplying this by 180, we'll get 39.6 which will result in answer as "40/1000". so i think this will be the method of obtaining the answer.
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mickey_p
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11.24.05 (3 years ago)
#3
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| swagatamb wrote: |
as per the method of answering given in this other post,
"The definition of eligible couples says the female is in reproductive age group (15 - 45 years). So each couple has around 30 years of reproduction".....with 3.3 GIRLS (it's GRR) per year. if sex ratio is 1000 females per 1000 males, that is equal to 6.6 children in 30 years, or .22 children per year. multiplying this by 180, we'll get 39.6 which will result in answer as "40/1000". so i think this will be the method of obtaining the answer. |
The answer is actually d (50/1000).
GRR is half of TFR (i.e. TFR in this case is 6.6)
There is a formula for this question.... it should make life simple for all of you I guess
CBR = (TFR x 8) + 1
where,
CBR = Crude birth rate
TFR = Total fertility rate (sometimes refered to as average completed family size)
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swagatamb
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11.24.05 (3 years ago)
#4
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but 6.6*8=52.8
52.8+1=53.8
which seems a bit far from the option you choose (50)
i'm not saying u r wrong, i may be 100% wrong bcoz i followed the method followed above.
can you plz give the reference of ur formula?
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sajjanshenoy
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11.25.05 (3 years ago)
#5
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I think answer given by swagatamb is right. It has some logic in it !
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mickey_p
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11.25.05 (3 years ago)
#6
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there is no need for reference for this as if you recollect TFR is the average no. of children (male and female) a woman will have at the end of her reproductive life span. GRR on the other hand is the average no. of GIRL child a woman will have at the end of reproductive life span (female TFR if you please). considering that our sex ratio is nearly 50:50 (a simplification of sorts to answer this question) then GRR becomes half of TFR. Remember there are no mortality figures in either TFR or GRR.
50/1000 comes closet to the precise answer that you calculated
Dr Manish
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mickey_p
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11.25.05 (3 years ago)
#7
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if you recollect TFR is the average no. of children (male and female) a woman will have at the end of her reproductive life span. GRR on the other hand is the average no. of GIRL child a woman will have at the end of reproductive life span (female TFR if you please). considering that our sex ratio is nearly 50:50 (a simplification of sorts to answer this question) then GRR becomes half of TFR. Remember there are no mortality figures in either TFR or GRR.
50/1000 comes closet to the precise answer that you calculated
As for the reference for the formula... well I dont have it now, I recall this from my PG days. Will try and find out if I can. I think its based on the current fertility patterns in India and may represent a simple linear regression equation for CBR (dependent) and TFR (independent variable)
Dr Manish
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