Business Analytics (2nd Edition)
2nd Edition
ISBN: 9780321997821
Author: James R. Evans
Publisher: PEARSON
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Chapter 1, Problem 12PE
Return on investment (ROl) is computed in the folIowng manner: ROl is equal to turnover multiplied by earnings as a percent of sales. Turnover is sales divided by total investment. Total investment is current assets (inventories, accounts receivable, and cash) plus fixed assets. Earnings equal sales minus the cost ot sales. The cost of sales consists of variable production costs, selling expenses, freight and delivery, and administrative costs.
- Construct an influence diagram that relates these variables
- Define symbols and develop a mathematical model
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(c) Because logistic regression predicts probabilities of outcomes, observations used to build a logistic regression model need not be independent.
A. false: all observations must be independent
B. true
C. false: only observations with the same outcome need to be independent
I ANSWERED: A. false: all observations must be independent.
(This was marked wrong but I have no idea why. Isn't this a basic assumption of logistic regression)
Business discuss
Spam filters are built on principles similar to those used in logistic regression. We fit a probability that each message is spam or not spam. We have several variables for each email. Here are a few: to_multiple=1 if there are multiple recipients, winner=1 if the word 'winner' appears in the subject line, format=1 if the email is poorly formatted, re_subj=1 if "re" appears in the subject line. A logistic model was fit to a dataset with the following output:
Estimate
SE
Z
Pr(>|Z|)
(Intercept)
-0.8161
0.086
-9.4895
0
to_multiple
-2.5651
0.3052
-8.4047
0
winner
1.5801
0.3156
5.0067
0
format
-0.1528
0.1136
-1.3451
0.1786
re_subj
-2.8401
0.363
-7.824
0
(a) Write down the model using the coefficients from the model fit.log_odds(spam) = -0.8161 + -2.5651 + to_multiple + 1.5801 winner + -0.1528 format + -2.8401 re_subj(b) Suppose we have an observation where to_multiple=0, winner=1, format=0, and re_subj=0. What is the predicted probability that this message is spam?…
Chapter 1 Solutions
Business Analytics (2nd Edition)
Ch. 1 - Discuss how you might use business analytics in...Ch. 1 - A supermarket has been experiencing long lines...Ch. 1 - Suggest some metrics that a hotel might want to...Ch. 1 - Prob. 4PECh. 1 - Classify each of the data elements in the Sales...Ch. 1 - Identify each of the variables in the Excel file...Ch. 1 - Classify each of the varaibles in the Excel file...Ch. 1 - A survey handed out to individuals at a major...Ch. 1 - A bank developed a model for predicting the...Ch. 1 - Four key marketing decision variables are price...
Ch. 1 - Suppose that a manufacturer can produce a part for...Ch. 1 - Return on investment (ROl) is computed in the...Ch. 1 - Total marketing effort is a term used to describe...Ch. 1 - Automobiles have different fuel economies (mpg),...Ch. 1 - A manufacturer of mp3 players is preparing to set...Ch. 1 - The demand for airline travel is quite sensitive...
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