Knowing that the Weibull distribution is a good fit for the data, we can then recalculate the process capability. Figure 6 shows that a Wiebull model with the lower bound at zero would produce a PPM of 233244.81. This estimate is far more accurate than the earlier estimate of the bounded normal distribution.
You can be contagious from a few days up to two weeks or more, depending on which virus is causing your stomach flu (gastroenteritis). A number of viruses can cause gastroenteritis, including noroviruses and rotaviruses.The contagious period â the time during which a sick person can give the illness to others â is slightly different for each virus. 1  Norovirus.2  With norovirus â the most common cause of viral gastroenteritis in adults and children â you're contagious from the moment you begin to feel ill. Some people may be contagious for up to two weeks after recovery. 2  Rotavirus. 3  Symptoms of rotavirus â the leading cause of viral gastroenteritis in infants and young children â usually appear one to three days after exposure.
The common cold contagious period may begin two to three days before symptoms appear and lasts about two weeks. As explained in this eMedTV article, the peak of the common cold contagious period usually occurs between day 2 and day 4 of the cold.