Manuel Cabral Morais
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View article: Two Features of the GINAR(1) Process and Their Impact on the Run-Length Performance of Geometric Control Charts
Two Features of the GINAR(1) Process and Their Impact on the Run-Length Performance of Geometric Control Charts Open
The geometric first-order integer-valued autoregressive process (GINAR(1)) can be particularly useful to model relevant discrete-valued time series, namely in statistical process control. We resort to stochastic ordering to prove that the …
View article: Hitting Times for Markov Time Series of Counts with Applications to Quality Control
Hitting Times for Markov Time Series of Counts with Applications to Quality Control Open
Examples of time series of counts arise in several areas, for instance in epidemiology, industry, insurance and network analysis. Several time series models for these counts have been proposed and some are based on the binomial thinning op…
View article: Impact of Falsely Assuming I.I.D. Output on the Probability of Misleading Signals
Impact of Falsely Assuming I.I.D. Output on the Probability of Misleading Signals Open
Misleading signals (MS) are valid alarms which correspond to the misinterpretation of a shift in the process mean (resp. variance) as a shift in the process variance (resp. mean), when we deal with simultaneous schemes for these two parame…
View article: Comments on “On Scale Parameter Monitoring of the Rayleigh Distributed Data Using a New Design”
Comments on “On Scale Parameter Monitoring of the Rayleigh Distributed Data Using a New Design” Open
We provide comments on a research paper proposing a control chart to monitor the scale parameter of a Rayleigh distribution. Our primary focus is on improving its average run length profile. We determine limits such that, on average, one c…
View article: An ARL‐unbiased c‐chart
An ARL‐unbiased c‐chart Open
In statistical process control (SPC), it is usual to assume that counts have a Poisson distribution. The non‐negative, discrete, and asymmetrical character of a control statistic with such a distribution and the value of its target mean ma…
View article: Granulomatous lymphadenitis caused by <i>Nocardia</i> species in hunted wild boar ( <i>Sus scrofa</i> ) in Portugal
Granulomatous lymphadenitis caused by <i>Nocardia</i> species in hunted wild boar ( <i>Sus scrofa</i> ) in Portugal Open
In humans, Nocardia species have the potential to cause localised or disseminated infection (Cooper and others 2014). This genus has previously been detected in wild ungulates (Vemireddi and others 2007, Domenis and others 2009) but not in…