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Does dichotomizing the dependent variable (i.e. logistic regression) decrease power in relation to a continuous dependent variable? I noticed the logistic regression PPT states Cohen mentioned 75 cases per predictor to detect a large effect, which on average, is larger than multiple regression. 2. What are nonnormal error terms, nonconstant error variance, and constraints on the response function? 3. The table on page 124 indicates XRAY was the only variable input into the equation and the model’s overall percentage correct was 75.47%. On page 125, STAGE was entered into the equation, but it looks like the model still correctly classified 75.47%. I noticed the Nagelkerke R^2 went up, so we are explaining more variance, but why would the classification table be identical?
A 56-question multiple choice test has 4 possible answers for each question and a student chooses the answers to each problem at random. A student selects 16 correct answers.
What is a discrete and continuous random variable? What is an example of each variable? What are the similarities and differences between each variable?
The chief of security for the Mall of the Dakotas was directed to study the problem of missing goods. He selected a sample of 100 boxes that had been tampered with and ascertained that for 60 of the boxes
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Find the probability that a given mouse will live. a. more than 32 months b. less than 28 months c. between 37 and 49 months.
For a random sample of 12 observations, the sample mean was 407 and the sample standard deviation 6. Using the .01 significance level: State the decision rule.
One of the criteria in their evaluation was the baggage capacity of the boat, evaluated using a 4-point rating scale from 1 to 4.
Is there a relationship between sales and newspaper advertising? Support your answer?
A 2005 study found that 202 women held board seats out of a total of 1,195 seats in the Fortune 100 companies. A 2003 study found that 779 women held board seats out of a total of 5,727 seats in the Fortune 500 companies.
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