Generally speaking, what are the methods available to the econometrician who wants to estimate a linear model with a fixed effects model design (i.e., dummy variable for individual units observed over multiple periods)?
A. Within Estimator and Fixed Effects regression
B. Within estimator and instrumental variable regression
C. Diff-in-diff and Two-stage least squares
D. Two-stage least squares and Fixed Effects regression
Answer: A
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The mechanical force generated by a contracting muscle is:
a. muscle fatigue b. a motor unit c. muscle tension d. a muscle twitch e. tetanus
Body cells of human females contain _____
a. one X chromosome b. two X chromosomes c. one Y chromosomes d. two Y chromosomes e. one X and one Y chromosome
The discovery of extinct glyptodont fossils and their close resemblance to present-day armadillos led Darwin to make which of the following deductions?
a) All species remain unchanged b) Populations must grow faster than the available food supply. c) Conditions of the day were not suitable for the glyptodonts. d) The present-day armadillos were ancestors of the much larger glyptodonts. e) Extinction was part of the natural "circle of life".
If 16% of the nucleotides in one strand of a DNA molecule contain the base G, what percent of the nucleotides on the complementary strand will also contain the base G?
A. 34% B. 8% C. 32% D. 16% E. Impossible to determine from the information given.