Estimating a probit or logit model via maximum likelihood involves all of the following except for what?
A. Choosing a determining function
B. Finding the coefficient estimates that maximize the likelihood function
C. Characterizing a likelihood function given choices about the distribution of observables
D. Setting up the moment conditions
Answer: D
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The main class(es) of neurotransmitters involved in regulating mood in vertebrate animals is/are
A. the biogenic amines. B. acetylcholine and amino acids. C. gases such as nitric oxide and carbon monoxide. D. amino acids. E. acetylcholine.
In the northeastern Pacific ocean, sea otters occur at a relatively low abundance. By preying upon sea urchins, sea otters maintain underwater kelp (large algae) "forests", which would otherwise be decimated by the herbivorous sea urchins. The kelp forests supply food for a wide variety of marine organisms, as well as providing refuge from predation and nursery habitat for juveniles. Based on this, what type of species best describes sea otters?
A. indicator species. B. flagship species. C. keystone species. D. dominant species. E. umbrella species.
ws+; ws+; ws; ws; ws+; ws+; ws; ws
In Neurospora, the white-spore allele (ws) results in white spores rather than the wild-type black spores. Diploid ws / ws+ cells undergo meiosis followed by one round of mitosis to form ordered tetrads. Indicate if the pattern of spores seen in the tetrads are consistent with first-division or second-division segregation. A) first-division segregation pattern B) second-division segregation pattern
Which one of the following is NOT a characteristic of the innate immune system?
A. It acts immediately or within hours of appropriate stimulus. B. Its response is enhanced on repeated exposure to pathogen C. It involves granulocytes. D. It involves one type of large, granular lymphocytes. E. It involves macrophages.