Fundamentals of Differential Equations and Boundary Value Problems
7th Edition
ISBN: 9780321977106
Author: Nagle, R. Kent
Publisher: Pearson Education, Limited
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Chapter 2.4, Problem 29E
To determine
(a)
To show:
The given differential equation is not exact.
To determine
(b)
To show:
The multiplication of equation
To determine
(c)
To solve:
The original differential equation.
To determine
(d)
To check:
Whether any solutions lost in the process.
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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 2 Solutions
Fundamentals of Differential Equations and Boundary Value Problems
Ch. 2.2 - Prob. 1ECh. 2.2 - In Problems 1-6, determine whether the given...Ch. 2.2 - Prob. 3ECh. 2.2 - Prob. 4ECh. 2.2 - Prob. 5ECh. 2.2 - Prob. 6ECh. 2.2 - Prob. 7ECh. 2.2 - Prob. 8ECh. 2.2 - Prob. 9ECh. 2.2 - Prob. 10E
Ch. 2.2 - Prob. 11ECh. 2.2 - Prob. 12ECh. 2.2 - Prob. 13ECh. 2.2 - Prob. 14ECh. 2.2 - Prob. 15ECh. 2.2 - Prob. 16ECh. 2.2 - Prob. 17ECh. 2.2 - Prob. 18ECh. 2.2 - Prob. 19ECh. 2.2 - Prob. 20ECh. 2.2 - Prob. 21ECh. 2.2 - Prob. 22ECh. 2.2 - Prob. 23ECh. 2.2 - Prob. 24ECh. 2.2 - Prob. 25ECh. 2.2 - Prob. 26ECh. 2.2 - Solutions Not Expressible in Terms of Elementary...Ch. 2.2 - Sketch the solution to the initial value problem...Ch. 2.2 - Prob. 29ECh. 2.2 - As stated in this section, the separation of...Ch. 2.2 - Interval of Definition. By looking at an initial...Ch. 2.2 - Analyze the solution y=(x) to the initial value...Ch. 2.2 - Prob. 33ECh. 2.2 - Prob. 34ECh. 2.2 - Prob. 35ECh. 2.2 - Prob. 36ECh. 2.2 - Prob. 37ECh. 2.2 - Prob. 38ECh. 2.2 - Prob. 39ECh. 2.2 - The atmospheric pressure force per unit area on a...Ch. 2.3 - In Problem 1-6, Determine whether the given...Ch. 2.3 - Prob. 2ECh. 2.3 - Prob. 3ECh. 2.3 - Prob. 4ECh. 2.3 - Prob. 5ECh. 2.3 - Prob. 6ECh. 2.3 - Prob. 7ECh. 2.3 - In Problems 7-16, obtain the general solution to...Ch. 2.3 - In Problems 7-16, obtain the general solution to...Ch. 2.3 - Prob. 10ECh. 2.3 - In Problems 7-16, obtain the general solution to...Ch. 2.3 - Prob. 12ECh. 2.3 - Prob. 13ECh. 2.3 - In Problems 7-16, obtain the general solution to...Ch. 2.3 - In Problems 7-16, obtain the general solution to...Ch. 2.3 - In Problems 7-16, obtain the general solution to...Ch. 2.3 - In Problems 17-22, solve the initial value...Ch. 2.3 - In Problem 17-22, solve the initial value problem....Ch. 2.3 - In Problem 17-22, solve the initial value problem....Ch. 2.3 - Prob. 20ECh. 2.3 - Prob. 21ECh. 2.3 - Prob. 22ECh. 2.3 - Prob. 23ECh. 2.3 - Prob. 24ECh. 2.3 - Prob. 25ECh. 2.3 - Prob. 26ECh. 2.3 - Constant Multiples of Solutions. a. Show that y=ex...Ch. 2.3 - Prob. 29ECh. 2.3 - Prob. 30ECh. 2.3 - Discontinuous Coefficients. As we will see in...Ch. 2.3 - Prob. 32ECh. 2.3 - Prob. 33ECh. 2.3 - Prob. 34ECh. 2.3 - Mixing Suppose a brine containing 0.2kg of salt...Ch. 2.3 - Variation of Parameters. Here is another procedure...Ch. 2.3 - Prob. 37ECh. 2.3 - Prob. 38ECh. 2.3 - The Nobel Prize in Physiology or Medicine in 1963...Ch. 2.4 - Prob. 1ECh. 2.4 - Prob. 2ECh. 2.4 - Prob. 3ECh. 2.4 - Prob. 4ECh. 2.4 - Prob. 5ECh. 2.4 - Prob. 6ECh. 2.4 - Prob. 7ECh. 2.4 - Prob. 8ECh. 2.4 - Prob. 9ECh. 2.4 - Prob. 10ECh. 2.4 - Prob. 11ECh. 2.4 - Prob. 12ECh. 2.4 - Prob. 13ECh. 2.4 - Prob. 14ECh. 2.4 - Prob. 15ECh. 2.4 - Prob. 16ECh. 2.4 - Prob. 17ECh. 2.4 - Prob. 18ECh. 2.4 - Prob. 19ECh. 2.4 - In Problems 9-20, determine whether the equation...Ch. 2.4 - Prob. 21ECh. 2.4 - Prob. 22ECh. 2.4 - Prob. 23ECh. 2.4 - Prob. 24ECh. 2.4 - Prob. 25ECh. 2.4 - Prob. 26ECh. 2.4 - Prob. 27ECh. 2.4 - Prob. 28ECh. 2.4 - Prob. 29ECh. 2.4 - Consider the equation...Ch. 2.4 - Prob. 31ECh. 2.4 - Prob. 32ECh. 2.4 - Prob. 33ECh. 2.4 - Prob. 34ECh. 2.4 - Prob. 35ECh. 2.4 - Prob. 36ECh. 2.5 - Prob. 1ECh. 2.5 - Prob. 2ECh. 2.5 - Prob. 3ECh. 2.5 - Prob. 4ECh. 2.5 - Prob. 5ECh. 2.5 - Prob. 6ECh. 2.5 - In Problems 7-12, solve the equation....Ch. 2.5 - In Problems 7-12, solve the equation....Ch. 2.5 - In Problems 7-12, solve the equation....Ch. 2.5 - In Problems 7-12, solve the equation....Ch. 2.5 - In Problems 7-12, solve the equation....Ch. 2.5 - In Problems 7-12, solve the equation....Ch. 2.5 - Prob. 13ECh. 2.5 - Prob. 14ECh. 2.5 - Prob. 15ECh. 2.5 - Prob. 16ECh. 2.5 - Prob. 17ECh. 2.5 - Prob. 18ECh. 2.5 - Prob. 19ECh. 2.5 - Prob. 20ECh. 2.6 - Prob. 1ECh. 2.6 - Prob. 2ECh. 2.6 - Prob. 3ECh. 2.6 - Prob. 4ECh. 2.6 - In Problems 1 -8, identify do not solve the...Ch. 2.6 - In Problems 1 -8, identify do not solve the...Ch. 2.6 - Prob. 7ECh. 2.6 - In Problems 1 -8, identify do not solve the...Ch. 2.6 - Prob. 9ECh. 2.6 - Use the method discussed under Homogeneous...Ch. 2.6 - Prob. 11ECh. 2.6 - Prob. 12ECh. 2.6 - Prob. 13ECh. 2.6 - Prob. 14ECh. 2.6 - Prob. 15ECh. 2.6 - Prob. 16ECh. 2.6 - Prob. 17ECh. 2.6 - Prob. 18ECh. 2.6 - Prob. 19ECh. 2.6 - Use the method discussed under Equations of the...Ch. 2.6 - Prob. 21ECh. 2.6 - Prob. 22ECh. 2.6 - Prob. 23ECh. 2.6 - Prob. 24ECh. 2.6 - Prob. 25ECh. 2.6 - Prob. 26ECh. 2.6 - Prob. 27ECh. 2.6 - Prob. 28ECh. 2.6 - Prob. 29ECh. 2.6 - Prob. 30ECh. 2.6 - Use the method discussed under Equations with...Ch. 2.6 - Use method discussed under Equation with Linear...Ch. 2.6 - Prob. 33ECh. 2.6 - Prob. 34ECh. 2.6 - Prob. 35ECh. 2.6 - Prob. 36ECh. 2.6 - Prob. 37ECh. 2.6 - Prob. 38ECh. 2.6 - Prob. 39ECh. 2.6 - Prob. 40ECh. 2.6 - Prob. 41ECh. 2.6 - Prob. 42ECh. 2.6 - Prob. 43ECh. 2.6 - Prob. 44ECh. 2.6 - Prob. 45ECh. 2.6 - Prob. 46ECh. 2.6 - Prob. 47ECh. 2.6 - Prob. 48ECh. 2.RP - Prob. 1RPCh. 2.RP - Prob. 2RPCh. 2.RP - Prob. 3RPCh. 2.RP - Prob. 4RPCh. 2.RP - Prob. 5RPCh. 2.RP - Prob. 6RPCh. 2.RP - Prob. 7RPCh. 2.RP - Prob. 8RPCh. 2.RP - Prob. 9RPCh. 2.RP - Prob. 10RPCh. 2.RP - Prob. 11RPCh. 2.RP - Prob. 12RPCh. 2.RP - Prob. 13RPCh. 2.RP - Prob. 14RPCh. 2.RP - Prob. 15RPCh. 2.RP - Prob. 16RPCh. 2.RP - Prob. 17RPCh. 2.RP - Prob. 18RPCh. 2.RP - Prob. 19RPCh. 2.RP - Prob. 20RPCh. 2.RP - Prob. 21RPCh. 2.RP - In Problem 1-30, solve the equation....Ch. 2.RP - Prob. 23RPCh. 2.RP - Prob. 24RPCh. 2.RP - Prob. 25RPCh. 2.RP - Prob. 26RPCh. 2.RP - In Problems 1-30, solve the equation....Ch. 2.RP - Prob. 28RPCh. 2.RP - Prob. 29RPCh. 2.RP - Prob. 30RPCh. 2.RP - Prob. 31RPCh. 2.RP - Prob. 32RPCh. 2.RP - In Problems 31-40, solve the initial value problem...Ch. 2.RP - Prob. 34RPCh. 2.RP - Prob. 35RPCh. 2.RP - Prob. 36RPCh. 2.RP - Prob. 37RPCh. 2.RP - Prob. 38RPCh. 2.RP - Prob. 39RPCh. 2.RP - Prob. 40RPCh. 2.RP - Prob. 41RP
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