Business Analytics
3rd Edition
ISBN: 9780135231678
Author: Evans, James R. (james Robert)
Publisher: PEARSON EDUCATION (COLLEGE)
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Textbook Question
Chapter 3, Problem 2.1CYU
Summarize the most useful charts available in Excel and the types of applications for which they should be used.
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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 3 Solutions
Business Analytics
Ch. 3 - Explain the pros and cons of tabular versus visual...Ch. 3 - How is data visualization used in descriptive,...Ch. 3 - Summarize the most useful charts available in...Ch. 3 - Prob. 2.2CYUCh. 3 - Prob. 2.3CYUCh. 3 - Prob. 2.4CYUCh. 3 - Prob. 3.1CYUCh. 3 - What is a heatmap, and what are some typical...Ch. 3 - Prob. 3.3CYUCh. 3 - Prob. 4.1CYU
Ch. 3 - Prob. 4.2CYUCh. 3 - Prob. 4.3CYUCh. 3 - Create clustered column and stacked column charts...Ch. 3 - Prob. 1.2PECh. 3 - Prob. 1.3PECh. 3 - Prob. 1.4PECh. 3 - Prob. 1.5PECh. 3 - Prob. 1.6PECh. 3 - Prob. 1.7PECh. 3 - Prob. 1.8PECh. 3 - Construct a column chart for the data in the Excel...Ch. 3 - The Excel file Internet Usage provides data about...Ch. 3 - Construct an appropriate chart to show the...Ch. 3 - Construct an appropriate chart or charts to...Ch. 3 - Prob. 1.13PECh. 3 - In the Excel file Banking Data, apply the...Ch. 3 - Prob. 1.15PECh. 3 - Prob. 1.16PECh. 3 - Prob. 1.17PECh. 3 - Prob. 1.18PECh. 3 - Create a useful dashboard for the data in the...Ch. 3 - Prob. 1.20PECh. 3 - Prob. 1.21PECh. 3 - Prob. 2.1PECh. 3 - Prob. 2.2PECh. 3 - Prob. 2.3PECh. 3 - Prob. 2.4PECh. 3 - Use PivotCharts to create a useful dashboard for...Ch. 3 - Prob. 2.6PECh. 3 - Prob. 2.7PECh. 3 - Prob. 2.8PECh. 3 - Use PivotCharts to create a useful dashboard for...
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