• Link break or the text get changed. So it would be helpful if you could provide a short summary describing the key points. 7 months, 3 weeks ago

  • Personally, I feel that there are two parts, which are important:
    1. How large are the results (=bias and non-linearity) compared to the tolerance range
    2. How large are the results compared to the standard deviation of the process.
    In order to combine these two considerations I would calculate the C_g and C_gk value, which judges the bias. To…[Read more]

  • Hi,
    suppose we have two random variables, y_1 and y_2, and that their population mean and standard deviations are mu_1, mu_2, and sigma_1, sigma_2, respectively. Then the standard deviation of the difference y_tot = y_2 – y_1 is given by sigma_tot = sqrt(sigma_1^2 + sigma_2^2) — note that we use a plus (!) in the standard deviation. Hence, the…[Read more]

  • Hi,
    personally, I never use specifications which are a result of what a supplier (or my company itself) is able to deliver. Instead, I define a specification due to our product requirements. Hence, my spec does not (!) include statistical quantities, but reads “the measured value must be inside the interval [x1, x2]”. Hence, I don’t have any…[Read more]