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By Eliane Regina Rodrigues, Jorge Alberto Achcar

​In this short we examine a few stochastic versions that could be used to review difficulties concerning environmental concerns, specifically, pollution. The effect of publicity to air toxins on people's future health is a truly transparent and good documented topic. hence, you will need to to acquire how one can are expecting or clarify the behaviour of pollution in most cases. reckoning on the kind of query that one is drawn to answering, there are a number of of how learning that challenge. between them we may perhaps quote, research of the time sequence of the pollution' measurements, research of the data acquired without delay from the knowledge, for example, day-by-day, weekly or per thirty days averages and traditional deviations. in a different way to review the behaviour of toxins in most cases is thru mathematical types. within the mathematical framework we can have for example deterministic or stochastic versions. the kind of types that we will think about during this short are the stochastic ones.​

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Extra resources for Applications of Discrete-time Markov Chains and Poisson Processes to Air Pollution Modeling and Studies

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4 [8] we have the estimates of the differences of means when data from region SW are taken into account. 4, we observe a decrease in the mean of the Poisson model around June 1992, September 1997, June 2001, and September 2002. Note that the mean of the Poisson models presents a substantial decrease in the year 1992 and also in 2001 (around summer and autumn of 1992 and 2001). However, following a period of decrease between two consecutive means, an increase occurs. We also may notice that the increase is, in general, larger than the decrease.

Similar results are also obtained when considering region CE and the first 25 days of the 2005.

Regarding the other parameter shared by both models, namely the parameter λ0 , the estimates produced by both Models II and III are such that in most of the cases (except in the case of region CE) they differ by a value smaller than 10. Hence, the difference that might exist between the estimated mean using Model II and the one using Model III is governed mainly by the behavior of the variables Wi , I = 1, 2, . . , N. In Fig. 1 [8] we have the plots of the observed (continuous line) and estimated posterior means for all regions when Models I, II, and III (dashed, dotted, and dashdotted lines, respectively) are used.

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