Suppose you are rating apples for quality, to ensure the restaurants you serve get the highest quality apples. The ratings are {1,2,3}, where 1 means bad, 2 is ok and 3 is excellent. But, you want to err on the side of giving lower ratings: you prefer to label an apple as bad if you are not sure, to avoid your customers being dissatisfied with the apples. Better to be cautious, and miss some good apples, than to sell low quality apples. You decide to encode this into the cost function. Your cost is as follows lâŷ – yl ŷ Y cost (ŷ, y) = (1) This cost is twice as high when your prediction for quality ŷ is greater than the actual quality y. The cost is zero when ŷ = y. To make your predictions, you get access to a vector of attributes (features) x describing the apple. Assume you have access to the true distribution p(y|x). You want to reason about (a) the optimal predictor, for each x. Assume you are given a feature vector x. Define c(ŷ) = E[cost(ŷ, Y)|X = x] %3D Let pi = p(y= 1|x), p2 = p(y = 2|x) and p3 = p(y = 3|x). Write down c(ŷ) for each ŷ E {1,2, 3}, in terms of pi: P2: P3:

Suppose you are rating apples for quality, to ensure the restaurants you serve get the highest quality apples. The ratings are {1,2,3}, where 1 means bad, 2 is ok and 3 is excellent. But, you want to err on the side of giving lower ratings: you prefer to label an apple as bad if you are not sure, to avoid your customers being dissatisfied with the apples. Better to be cautious, and miss some good apples, than to sell low quality apples. You decide to encode this into the cost function. Your cost is as follows lâŷ – yl ŷ Y cost (ŷ, y) = (1) This cost is twice as high when your prediction for quality ŷ is greater than the actual quality y. The cost is zero when ŷ = y. To make your predictions, you get access to a vector of attributes (features) x describing the apple. Assume you have access to the true distribution p(y|x). You want to reason about (a) the optimal predictor, for each x. Assume you are given a feature vector x. Define c(ŷ) = E[cost(ŷ, Y)|X = x] %3D Let pi = p(y= 1|x), p2 = p(y = 2|x) and p3 = p(y = 3|x). Write down c(ŷ) for each ŷ E {1,2, 3}, in terms of pi: P2: P3:

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.6: Summarizing Categorical Data

Problem 28PPS

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