We first describe a number of inter-related issues that need to be considered by the researcher when comparing frequencies of linguistic features in two or more corpora. We then describe the chi-squared and log-likelihood tests used in previous research for the comparison of word frequencies. Our focus, in this paper, is on the issue of reliability of the statistical tests, and we describe simu...

in zero acceptance number sampling plans, the sample items of an incoming lot are inspected one by one. the proposed method in this research follows these rules: if the number of nonconforming items in the first sample is equal to zero, the lot is accepted but if the number of nonconforming items is equal to one, then second sample is taken and the policy of zero acceptance number would be appl...

In this paper, we propose the first fully polynomial-time randomized approximation scheme (FPRAS) for basic queueing networks, closed Jackson networks with single servers. Our algorithm is based on MCMC (Markov chain Monte Carlo) method. Thus, our scheme returns an approximate solution, of which the size of error satisfies a given error rate. We propose two Markov chains, one is for approximate...

The main purpose of this research is identifying socio - economic factors that influence participation of young people in virtual space. The research method in this research is Survey and in terms of aim is applied and extensive level, Statistical population consists of all 20 to 34-year-old youth in Tehran that according to the results of the general census of population and housing in 2011 ha...

A number of techniques for probability sampling without replacement (SWOR) have been suggested, although it is not clear which method is consistently superior in terms of statistical efficiency. Rao and Bayless (1969) empirically studied the stability of estimators of the population total for a variety of methods of unequal probability SWOR when selecting two units per stratum. One of their maj...