The Syrian hamster has an average life span of two to three years. Although uncommon, these hamsters can sometimes live up to five years. A hamster's life span can be extended to a degree by providing it with a clean environment and fresh food daily. Continue Reading.
and substituting the estimate for gives. which is an unbiased estimator of the variance of the mean in terms of the observed sample variance and known quantities. Note that, if the autocorrelations are identically zero, this expression reduces to the well-known result for the variance of the mean for independent data.
Following the previous description of unbiasedness, a forecast will be unbiased for Î³ = Ï/4, while all forecast errors will have an angle Î³ between 0 and Ï/2. Instead of using Î³ that is expressed radians, we can define the Bias Coefficient : The bias coefficient is a unit-free metric. A forecast that is always over the observed values will have a bias coefficient equal to -1, always over-forecasting, while the bias coefficient will be equal to 1 for the opposite case. Let us visualise the bias coefficient in the following figure.