Numerical Analysis
10th Edition
ISBN: 9781305730663
Author: Richard L. Burden; J. Douglas Faires; Annette M. Burden
Publisher: Cengage Learning US
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Chapter 1.1, Problem 10ES
Find the third Taylor polynomial P3(x) for the function
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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
Numerical Analysis
Ch. 1.1 - Show that the following equations have at least...Ch. 1.1 - Show that the following equations have at least...Ch. 1.1 - Find intervals containing solutions to the...Ch. 1.1 - Find intervals containing solutions to the...Ch. 1.1 - Find maxaxb |f(x)| for the following functions and...Ch. 1.1 - Find maxaxb | f(x)| for the following functions...Ch. 1.1 - Show that f(x) is 0 at least once in the given...Ch. 1.1 - Suppose f C[a, b] and f (x) exists on (a, b)....Ch. 1.1 - Let f(x) = x3. a. Find the second Taylor...Ch. 1.1 - Find the third Taylor polynomial P3(x) for the...
Ch. 1.1 - Find the second Taylor polynomial P2(x) for the...Ch. 1.1 - Repeat Exercise 11 using x0 = /6. 11. Find the...Ch. 1.1 - Prob. 13ESCh. 1.1 - Prob. 14ESCh. 1.1 - Prob. 15ESCh. 1.1 - Use the error term of a Taylor polynomial to...Ch. 1.1 - Use a Taylor polynomial about /4 to approximate...Ch. 1.1 - Let f(x) = (1 x)1 and x0 = 0. Find the nth Taylor...Ch. 1.1 - Let f(x) = ex and x0 = 0. Find the nth Taylor...Ch. 1.1 - Prob. 20ESCh. 1.1 - The polynomial P2(x)=112x2 is to be used to...Ch. 1.1 - Use the Intermediate Value Theorem 1.11 and Rolles...Ch. 1.1 - Prob. 23ESCh. 1.1 - In your own words, describe the Lipschitz...Ch. 1.2 - Compute the absolute error and relative error in...Ch. 1.2 - Compute the absolute error and relative error in...Ch. 1.2 - Prob. 3ESCh. 1.2 - Find the largest interval in which p must lie to...Ch. 1.2 - Perform the following computations (i) exactly,...Ch. 1.2 - Use three-digit rounding arithmetic to perform the...Ch. 1.2 - Use three-digit rounding arithmetic to perform the...Ch. 1.2 - Repeat Exercise 7 using four-digit rounding...Ch. 1.2 - Repeat Exercise 7 using three-digit chopping...Ch. 1.2 - Prob. 10ESCh. 1.2 - Prob. 11ESCh. 1.2 - Prob. 12ESCh. 1.2 - Let f(x)=xcosxsinxxsinx. a. Find limx0 f(x). b....Ch. 1.2 - Let f(x)=exexx. a. Find limx0(ex ex )/x. b. Use...Ch. 1.2 - Use four-digit rounding arithmetic and the...Ch. 1.2 - Prob. 16ESCh. 1.2 - Prob. 17ESCh. 1.2 - Repeat Exercise 16 using four-digit chopping...Ch. 1.2 - Use the 64-bit-long real format to find the...Ch. 1.2 - Prob. 23ESCh. 1.2 - Discuss the difference between the arithmetic...Ch. 1.2 - Prob. 2DQCh. 1.2 - Discuss the various different ways to round...Ch. 1.2 - Discuss the difference between a number written in...Ch. 1.3 - The Maclaurin series for the arctangent function...Ch. 1.3 - Prob. 4ESCh. 1.3 - Prob. 5ESCh. 1.3 - Find the rates of convergence of the following...Ch. 1.3 - Find the rates of convergence of the following...Ch. 1.3 - Prob. 8ESCh. 1.3 - Prob. 9ESCh. 1.3 - Suppose that as x approaches zero,...Ch. 1.3 - Prob. 11ESCh. 1.3 - Prob. 12ESCh. 1.3 - Prob. 13ESCh. 1.3 - Prob. 14ESCh. 1.3 - a. How many multiplications and additions are...Ch. 1.3 - Write an algorithm to sum the finite series i=1nxi...Ch. 1.3 - Construct an algorithm that has as input an...Ch. 1.3 - Let P(x) = anxn + an1xn1 + + a1x + a0 be a...Ch. 1.3 - Prob. 4DQCh. 1.3 - Prob. 5DQCh. 1.3 - Prob. 6DQ
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