Exam 8: Nonlinear Optimization Models

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In the case of functions with multiple local optima, most nonlinear optimization software methods can get stuck and terminate at a local optimum.

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For a typical nonlinear problem, duals price are relatively insensitive to small changes in right-hand side values.

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A feasible solution is a global optimum if there are no other feasible points with a better objective function value in the feasible region.

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The problem of maximizing a concave quadratic function over a linear constraint set is relatively difficult to solve.

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There are nonlinear applications in which there is a single local optimal solution that is also the global optimal solution.

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​Describe the difference between a convex function and a concave function and give an example of each.

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Financial planner Minnie Margin wishes to develop a mutual fund portfolio based on the Markowitz portfolio model. She needs to determine the proportion of the portfolio to invest in each of the five mutual funds listed below so that the variance of the portfolio is minimized subject to the constraint that the expected return of the portfolio be at least 5%. Formulate the appropriate nonlinear program. ​​ Financial planner Minnie Margin wishes to develop a mutual fund portfolio based on the Markowitz portfolio model. She needs to determine the proportion of the portfolio to invest in each of the five mutual funds listed below so that the variance of the portfolio is minimized subject to the constraint that the expected return of the portfolio be at least 5%. Formulate the appropriate nonlinear program. ​​

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Many linear programming algorithms such as the simplex method optimize by examining only the extreme points of the feasible region.

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​Explain how the local minimum, local maximum, local optimum, global minimum, global maximum, and global optimum relate to one another in nonlinear optimization problems.

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For a minimization problem, a point is a global minimum if there are no other feasible points with a smaller objective function value.

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The Markowitz mean-variance portfolio model presented in the text is a convex optimization problem.

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​Explain how the parameters required for the Bass new-product adoption model can be estimated when no historical data are available for the new product.

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When components (or ingredients) in a blending problem must be pooled, the number of feasible solutions is reduced.

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It is possible for the optimal solution to a nonlinear optimization problem to lie in the interior of the feasible region.

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Shampooch is a mobile dog grooming service firm that has been quite successful developing a client base in the Dallas area. The firm plans to expand to other cities in Texas during the next few years. Shampooch would like to use its Dallas subscription data shown below to develop a model for forecasting service subscriptions in cities where it might expand. The first step is to estimate values for p (coefficient of innovation) and q (coefficient of imitation). Formulate the appropriate nonlinear program. Shampooch is a mobile dog grooming service firm that has been quite successful developing a client base in the Dallas area. The firm plans to expand to other cities in Texas during the next few years. Shampooch would like to use its Dallas subscription data shown below to develop a model for forecasting service subscriptions in cities where it might expand. The first step is to estimate values for p (coefficient of innovation) and q (coefficient of imitation). Formulate the appropriate nonlinear program.

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A function is quadratic if its nonlinear terms have a power of 4.

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Financial planner Minnie Margin has a substantial number of clients who wish to own a mutual fund portfolio that matches, as a whole, the performance of the Russell 2000 index. Her task is to determine what proportion of the portfolio should be invested in each of the five mutual funds listed below so that the portfolio most closely mimics the performance of the Russell 2000 index. Formulate the appropriate nonlinear program. ​ Financial planner Minnie Margin has a substantial number of clients who wish to own a mutual fund portfolio that matches, as a whole, the performance of the Russell 2000 index. Her task is to determine what proportion of the portfolio should be invested in each of the five mutual funds listed below so that the portfolio most closely mimics the performance of the Russell 2000 index. Formulate the appropriate nonlinear program. ​   ​ ​

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Which of the following is incorrect?

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Native Customs sells two popular styles of hand-sewn footwear: a sandal and a moccasin. The cost to make a pair of sandals is $18, and the cost to make a pair of moccasins is $24. The demand for these two items is sensitive to the price, and historical data indicate that the monthly demands are given by S = 400 − 10P1 and M = 450 − 15P2 , where S = demand for sandals (in pairs), M = demand for moccasins (in pairs), P1 = price for a pair of sandals, and P2 = price for a pair of moccasins. To remain competitive, Native Customs must limit the price (per pair) to no more than $60 and $75 for its sandals and moccasins, respectively. Formulate this nonlinear programming problem to find the optimal production quantities and prices for sandals and moccasins that maximize total monthly profit.

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When the number of blending components exceeds the number of storage facilities, the number of feasible solutions to the blending problem

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