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Introductory Econometrics 4th Edition by Jeffrey Wooldridge
Edition 4ISBN: 978-0324660609Introductory Econometrics 4th Edition by Jeffrey Wooldridge
Edition 4ISBN: 978-0324660609 Exercise 2
Use the data in BWGHT.RAW to answer this question.
(i) How many women are in the sample, and how many report smoking during pregnancy
(ii) What is the average number of cigarettes smoked per day Is the average a good measure of the "typical" woman in this case Explain.
(iii) Among women who smoked during pregnancy, what is the average number of cigarettes smoked per day How does this compare with your answer from part (ii), and why
(iv) Find the average of fatheduc in the sample. Why are only 1,192 observations usedto compute this average
(v) Report the average family income and its standard deviation in dollars.
(i) How many women are in the sample, and how many report smoking during pregnancy
(ii) What is the average number of cigarettes smoked per day Is the average a good measure of the "typical" woman in this case Explain.
(iii) Among women who smoked during pregnancy, what is the average number of cigarettes smoked per day How does this compare with your answer from part (ii), and why
(iv) Find the average of fatheduc in the sample. Why are only 1,192 observations usedto compute this average
(v) Report the average family income and its standard deviation in dollars.
Explanation
Verified
Verified
(i)
There are 1,388 observations in the sample. Tabulating the variable cigs shows that 212 women have cigs 0.
(ii)
The average of cigs is about 2.09, but this includes the 1,176 women who did not smoke. Reporting just the average masks the fact that almost 85 percent of the women did not smoke. It makes more sense to say that the "typical" woman does not smoke during pregnancy; indeed, the median number of cigarettes smoked is zero.
(iii)
The average of cigs over the women with cigs 0 is about 13.7. Of course this is much higher than the average over the entire sample because 1,176 zeroes are being excluded.
(iv)
The average of fatheduc is about 13.2. There are 196 observations with a missing value for fatheduc , and those observations are necessarily excluded in computing the average.
(v)
The average and standard deviation of faminc are about 29.027 and 18.739, respectively, but faminc is measured in thousands of dollars. So, in dollars, the average and standard deviation are $29,027 and $18,739.
There are 1,388 observations in the sample. Tabulating the variable cigs shows that 212 women have cigs 0.
(ii)
The average of cigs is about 2.09, but this includes the 1,176 women who did not smoke. Reporting just the average masks the fact that almost 85 percent of the women did not smoke. It makes more sense to say that the "typical" woman does not smoke during pregnancy; indeed, the median number of cigarettes smoked is zero.
(iii)
The average of cigs over the women with cigs 0 is about 13.7. Of course this is much higher than the average over the entire sample because 1,176 zeroes are being excluded.
(iv)
The average of fatheduc is about 13.2. There are 196 observations with a missing value for fatheduc , and those observations are necessarily excluded in computing the average.
(v)
The average and standard deviation of faminc are about 29.027 and 18.739, respectively, but faminc is measured in thousands of dollars. So, in dollars, the average and standard deviation are $29,027 and $18,739.
Introductory Econometrics 4th Edition by Jeffrey Wooldridge
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