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Fundamentals of Differential Equations [With CDROM] - 7th Edition
7th Edition
ISBN: 9780321410481
Author: Saff, Edward B., Snider, Arthur David, Nagle, R. Kent
Publisher: Addison Wesley
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Chapter 11.8, Problem 3E
To determine
To prove:
The solution
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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 11 Solutions
Fundamentals of Differential Equations [With CDROM] - 7th Edition
Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 3ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 7ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 9ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...
Ch. 11.2 - Prob. 11ECh. 11.2 - In Problems 1-12, determine the solutions, if any,...Ch. 11.2 - Prob. 13ECh. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - Prob. 16ECh. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 13-20, find all the real eigenvalues...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.2 - In Problems 23-26, find all the real values of ...Ch. 11.3 - In Problem 1-6, convert the given equation into...Ch. 11.3 - In Problem 1-6, convert the given equation into...Ch. 11.3 - Prob. 3ECh. 11.3 - In Problem 1-6, convert the given equation into...Ch. 11.3 - Prob. 5ECh. 11.3 - In Problems 1-6, convert the given equation into...Ch. 11.3 - Prob. 7ECh. 11.3 - In problem 7-11, determine whether the given...Ch. 11.3 - In problem 7-11, determine whether the given...Ch. 11.3 - Prob. 10ECh. 11.3 - Prob. 11ECh. 11.3 - Prob. 12ECh. 11.3 - Let be an eigenvalue and a corresponding...Ch. 11.3 - Prob. 15ECh. 11.3 - Show that if =u+iv is an eigenfunction...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - In Problems 17 -24, a determine the normalized...Ch. 11.3 - Prob. 25ECh. 11.3 - Prove that the linear differential operator...Ch. 11.4 - Prob. 1ECh. 11.4 - Prob. 2ECh. 11.4 - Prob. 3ECh. 11.4 - Prob. 4ECh. 11.4 - Prob. 5ECh. 11.4 - Prob. 6ECh. 11.4 - In Problems 7-10, find theadjointoperator and its...Ch. 11.4 - Prob. 8ECh. 11.4 - Prob. 9ECh. 11.4 - In Problems 7-10, find the adjoint operator and...Ch. 11.4 - Prob. 11ECh. 11.4 - Prob. 12ECh. 11.4 - Prob. 13ECh. 11.4 - Prob. 14ECh. 11.4 - Prob. 15ECh. 11.4 - Prob. 16ECh. 11.4 - Prob. 17ECh. 11.4 - Prob. 18ECh. 11.4 - Prob. 19ECh. 11.4 - Prob. 20ECh. 11.4 - Prob. 21ECh. 11.4 - Prob. 22ECh. 11.4 - Prob. 23ECh. 11.4 - Prob. 24ECh. 11.4 - Prob. 25ECh. 11.4 - Prob. 26ECh. 11.4 - Prob. 27ECh. 11.4 - Prob. 28ECh. 11.4 - Prob. 29ECh. 11.5 - Prob. 1ECh. 11.5 - In Problems 1-8, find a formal eigenfunction...Ch. 11.5 - Prob. 3ECh. 11.5 - In Problems 1-8, find a formal eigenfunction...Ch. 11.5 - Prob. 5ECh. 11.5 - Prob. 6ECh. 11.5 - Prob. 7ECh. 11.5 - Prob. 8ECh. 11.5 - In Problem 9-14, find a formal eigenfunction...Ch. 11.5 - In Problem 9-14, find a formal eigenfunction...Ch. 11.5 - Prob. 11ECh. 11.5 - Prob. 12ECh. 11.5 - In Problem 9-14, find a formal eigenfunction...Ch. 11.5 - Derive the solution to Problem 12 given in...Ch. 11.6 - Prob. 1ECh. 11.6 - Prob. 2ECh. 11.6 - Prob. 3ECh. 11.6 - Prob. 4ECh. 11.6 - Prob. 5ECh. 11.6 - In Problems 1-10, find the Greens function G(x,s)...Ch. 11.6 - Prob. 7ECh. 11.6 - Prob. 8ECh. 11.6 - Prob. 9ECh. 11.6 - Prob. 10ECh. 11.6 - In problems 11 -20, use Greens functions to solve...Ch. 11.6 - In problems 11 -20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - In Problems 11-20, use Greens functions to solve...Ch. 11.6 - Derive a formula using a Greens function for the...Ch. 11.6 - Prob. 22ECh. 11.6 - Prob. 23ECh. 11.6 - Prob. 24ECh. 11.6 - Prob. 25ECh. 11.6 - Prob. 26ECh. 11.6 - Prob. 31ECh. 11.7 - Prob. 2ECh. 11.7 - Prob. 3ECh. 11.7 - Prob. 4ECh. 11.7 - Prob. 5ECh. 11.7 - Prob. 6ECh. 11.7 - Prob. 8ECh. 11.7 - Prob. 9ECh. 11.7 - Prob. 10ECh. 11.7 - Prob. 11ECh. 11.7 - Prob. 12ECh. 11.7 - Show that the only eigenfunctions of 23-24...Ch. 11.7 - a. Use formula 25 to show that Pn(x) is an odd...Ch. 11.7 - Prob. 16ECh. 11.8 - Prob. 1ECh. 11.8 - Prob. 2ECh. 11.8 - Prob. 3ECh. 11.8 - Can the function (x)=x4sin(1/x) be a solution on...Ch. 11.8 - Prob. 6ECh. 11.8 - Prob. 7ECh. 11.8 - Prob. 8ECh. 11.8 - Prob. 9ECh. 11.8 - Prob. 10ECh. 11.8 - Prob. 11ECh. 11.8 - In equation (10), assume Q(x)m2 on [a,b]. Prove...Ch. 11.8 - Prob. 13ECh. 11.8 - Show that if Q(x)m20 on [a,), then every solution...Ch. 11.RP - Find all the real eigen-values and eigen-functions...Ch. 11.RP - Prob. 2RPCh. 11.RP - a. Determine the eigenfunctions, which are...Ch. 11.RP - Prob. 4RPCh. 11.RP - Use the Fredholm alternative to determine...Ch. 11.RP - Find the formal eigenfunction expansion for the...Ch. 11.RP - Find the Greens function G(x,s) and use it to...Ch. 11.RP - Find a formal eigenfunction expansion for the...Ch. 11.RP - Let (x) be a nontrivial solution to...Ch. 11.RP - Use Corollary 5 in Section 11.8 to estimate the...
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