Read e-book online Fuzzy Statistics PDF

By Prof. James J. Buckley (auth.)

ISBN-10: 3540399194

ISBN-13: 9783540399193

ISBN-10: 3642059244

ISBN-13: 9783642059247

This monograph introduces ordinary fuzzy information in accordance with crisp (non-fuzzy) information. within the introductory chapters the booklet provides a truly readable survey of fuzzy units together with fuzzy mathematics and fuzzy services. The booklet develops fuzzy estimation and demonstrates the development of fuzzy estimators for varied very important and particular instances of variance, suggest and distribution services. it really is proven how you can use fuzzy estimators in speculation checking out and regression, which results in a entire presentation of fuzzy speculation trying out and fuzzy regression in addition to fuzzy prediction.

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Now we would like to use the normal approximation to the binomial to construct confidence intervals for PI - P2. To do this nl and n2 need to be sufficiently large. So we assume that the sample sizes are sufficiently large so that we may use the normal approximation. Now Pi is (approximately) normally distributed with mean Pi and variance Pi(l- Pi)/ni, i = 1,2. Then PI - fi2 is (approximately) normally distributed with mean PI -P2 and variance PI (I-PI)/nl +p2(I-P2)/n2. This would lead directly to confidence interval, but however we can not evaluate the variance expression because we do not know a value for PI and P2.

Xn from N(p" a 2 ). Suppose the mean of this random sample turns out to be x, which is a crisp number, not a fuzzy number. Also, let S2 be the sample variance. Our point estimator of p, is x. If the values of the random sample are Xl, •.. 1) 1). 2 of [1]). 2) where tf3/ 2 is defined from the (Student's) t distribution, with n - 1 degrees of freedom, so that the probability of exceeding it is fJ /2. Now solve the inequality for p, giving P(x - t{:Jj2S/v'ii ~ p, ~ x + t{:Jj2S/v'ii) = 1 - fJ. 4) 23 CHAPTER 4.

7) in Chapter 3. 3/2Vp(1 - p)/n) ~ 1 - (3. 3/2Vp(1 - p)/n]. 3) However, we have no value for p to use in this confidence interval. 3), 27 28 CHAPTER 5. 3/2Vpqjn,p + Z{3/2Vpqjn]. 4) Put these confidence intervals together, as discussed in Chapter 3, and we get p our triangular shaped fuzzy number estimator of p. 5143. 001) :::; (J :::; 1. 01 :::; (J :::; 1. 1, without dropping the graph straight down to the x-axis at the end points. 1 are in Chapter 29. 2, again without dropping the graph straight down to the x-axis at the end points.

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Fuzzy Statistics by Prof. James J. Buckley (auth.)


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