Question

--In the GSS, the original race variable was coded as: whites=1, blacks=2, others=3. Which of the following possibilities is the best way to recode this variable into a dichotomy with “white” as the reference category?

a.) whites=1, non-whites=2

b.) non-whites=1, whites=2

c.) whites=0, non-whites=1

d.) whites=-1, non-whites=+1

-- Another word for the reference group is:

a.) the omitted variable

b.) the omitted slope

c.) the omitted category

d.) the omitted constant

-- Here is a regression equation using GSS2008 data, people aged 21 to 29, where men were coded as 0, and women were coded as 1:

# OF TIMES GO TO BAR PER MONTH = 4.00 – 1.73 (SEX)

If women had been coded as 0, and men had been coded as 1, the regression equation would have been:

a.) # OF TIMES GO TO BAR PER MONTH = 4.00 – 1.73 (SEX)

b.) # OF TIMES GO TO BAR PER MONTH = 2.27 + 1.73 (SEX)

c.) # OF TIMES GO TO BAR PER MONTH = 5.73 – 1.73 (SEX)

d.) # OF TIMES GO TO BAR PER MONTH = 4.00 – 2.27 (SEX)

--If we wanted to use the GSS variable HEALTH (self-assessment of health: Excellent, Good, Fair, or Poor) as an independent variable in a regression model using a dummy approach, how many independent variables would we have to create (not including the reference category)?

a.) None, this variable is perfectly fine as is to use in a regression equation.

b.) 2

c.) 3

d.) 4

--A researcher creates a set of four reference-group variables to include in a regression. What can you assume about the variable from which she built these variables?

a.) It likely had three categories

b.) It likely had four categories

c.) It likely had five categories

d.) It likely had six categories

--- With which of the following variables would you most likely not use the reference-grouping technique?

a.) a nominal-level variable

b.) an ordinal-level variable

c.) a ratio-level variable

d.) all are equally likely

Answer 1

In the GSS, the original race variable was coded as: whites=1, blacks=2, others=3. Which of the following possibilities is the best way to recode this variable into a dichotomy with “white” as the reference category?

Answer: c.) whites=0, non-whites=1

Another word for the reference group is:

Answer: c.) the omitted category​

Here is a regression equation using GSS2008 data, people aged 21 to 29, where men were coded as 0, and women were coded as 1:

# OF TIMES GO TO BAR PER MONTH = 4.00 – 1.73 (SEX)

If women had been coded as 0, and men had been coded as 1, the regression equation would have been:

Answer: b.) # OF TIMES GO TO BAR PER MONTH = 2.27 + 1.73 (SEX)​

If we wanted to use the GSS variable HEALTH (self-assessment of health: Excellent, Good, Fair, or Poor) as an independent variable in a regression model using a dummy approach, how many independent variables would we have to create (not including the reference category)?

Answer: c.) 3​

A researcher creates a set of four reference-group variables to include in a regression. What can you assume about the variable from which she built these variables?​

Answer: c.) It likely had five categories​

With which of the following variables would you most likely not use the reference-grouping technique?

Answer: c.) a ratio-level variable​