Chen and Jernigan proposed a non-parametric, conservative method that involved using a penalized mean to estimate the average concentration of contaminants in soils. The method assumes a random sample obtained from a whole site involved in the US Superfund program. However, in some cases, about...

In this paper, we present an intuitive graphical approach to model validity, which, although to some extent subjective, can be extremely valuable for both presentation and interpretation purposes. In particular, the idea behind such a procedure arises naturally through the generation of a...

Polynomial autoregressions are usually considered to be unrealistic models for time series. However, this paper shows that they can successfully be used when the purpose of the time series study is to provide forecasts. A projection scheme inspired from projection pursuit regression and...

The local influence method is adapted to investigate the influence of observations on testing the linear hypothesis. The method provides information about individually or jointly influential observations in performing the test, which the usual diagnostic methods do not yield. An example is...

This paper introduces a mixture model that combines proportional hazards regression with logistic regression for the analysis of survival data, and describes its parameter estimation via an expectation maximization algorithm. The mixture model is then applied to analyze the determinants of the...

The discordancy test for multiple outliers is complicated by problems of masking and swamping. The key to the settlement of the question lies in the determination of k , i.e. the number of 'contaminants' in a sample. Great efforts have been made to solve this problem in recent years, but no...

T = \[x + … + x ]/ Sigma x (T*= \[x + … + x ] Sigma x ) is the max k (n- k+ 1 ) (n) i k ( 1 ) (k) i imum likelihood ratio test statistic for k upper ( lower ) outliers in an exponential sample x , …, x . The null distributions of T for k= 1,2 were given by Fisher and by Kimber 1 n k and...

This paper extends the concept of chain sampling to variables inspection when the standard deviation of the normally distributed characteristic is known. A discussion of the shape of the known sigma single-sampling variables plan is given. The chain sampling plan for variables inspection will be...

The zero acceptance number plan is invariably used for compliance sampling and safety inspection of products. The disadvantage of such a plan is that its discriminating power between good and bad lots is poor. This paper presents a quick switching system that has zero acceptance numbers, with a...

In this paper, a new tightening concept has been incorporated into the single-level continuous sampling plan CSP-1, such that quality degradation will warrant sampling inspection to cease beyond a certain number of sampled items, until new evidence of good quality is established. The expressions...