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Decomposing a Sequence into Independent Subsequences Using
Decomposing a Sequence into Independent Subsequences Using

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... it possible to detect either unusually rapid rating of products by a user (due to having a concentration of small time differences), or unusually regular patterns, such as rating products once every hour. Both of these patterns suggest bot-like or spammy behavior, which we would like to detect. More ...
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... in which θA ∈ ΘA is a kA × 1 vector of unobservables 2) the prior density p(θA |A) 3) the vector of interest density (the posterior density) ...
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指導教授:黃三益 博士 組員:B924020007 王俐文 B924020009
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... 1. Compared with other data set, our data are not large enough. So we maybe get some troubles in the modeling process, such as outliers, skew distributions and missing values. 2. The values of the attribute named Media Exposure always show “Good”, so we can not estimate whether this attribute works ...
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... which also has 5 parameters (two means, two variances, and a correlation). This is still a univariate distribution. The idea is for each observation Xi , there is a probability α that Xi comes from a N(µ1 , σ12 ), and a probability 1 − α that Xi comes from a N(µ2 , σ22 ). This is also different from ...
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... probability. • Bayesian Probability : A person’s degree of belief in event X. Personal probability. • Unlike classical probability, Bayesian probabilities benefit from but do not require repeated trials only focus on next event; e.g. probability Seawolves win next game? ...
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Mixture model

In statistics, a mixture model is a probabilistic model for representing the presence of subpopulations within an overall population, without requiring that an observed data set should identify the sub-population to which an individual observation belongs. Formally a mixture model corresponds to the mixture distribution that represents the probability distribution of observations in the overall population. However, while problems associated with ""mixture distributions"" relate to deriving the properties of the overall population from those of the sub-populations, ""mixture models"" are used to make statistical inferences about the properties of the sub-populations given only observations on the pooled population, without sub-population identity information.Some ways of implementing mixture models involve steps that attribute postulated sub-population-identities to individual observations (or weights towards such sub-populations), in which case these can be regarded as types of unsupervised learning or clustering procedures. However not all inference procedures involve such steps.Mixture models should not be confused with models for compositional data, i.e., data whose components are constrained to sum to a constant value (1, 100%, etc.). However, compositional models can be thought of as mixture models, where members of the population are sampled at random. Conversely, mixture models can be thought of as compositional models, where the total size of the population has been normalized to 1.
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