Methods for detecting influential observations for the Weibull model fit to censored data are discussed. These methods include: one-step deletion diagnostics, influence functions and curvature diagnostics. Results indicate that the curvature diagnostics may be helpful in detecting masking.

Coastal waters represent the commingling of offshore marine and terrestrial surface source waters and therefore are naturally complex and variable. Our long term goal is to establish observational and modeling approaches to predict sources and scales of variability in the source waters, particularly those related to land use activities in upstream watersheds, from observations and measurements ...

In this paper, we describe an innovative project where Web technologies are exploited to foster science learning in an integrated but mobile smart learning environment. Contextawareness is considered a crucial skill in science learning, therefore we imagined a solution to train students for context awareness by illustrating context gaps based on on-site observations and measurements. A componen...

One the most cited papers in astronomy is Ken Freeman's 1970 paper on exponential disks in galaxies. In this contribution I review what has been done in this area since then and what we can infer about systematic properties of disks in galaxies from surface photometry, HI synthesis observations and measurements of stellar kinematics. Most disks have radial truncations at 3.6 ± 0.6 radial scalel...

Methods of detecting influential observations for the normal model for censored data are proposed. These methods include one-step deletion methods, deletion of observations and the empirical influence function. Emphasis is placed on assessing the impact that a single ohservatioii has on the estimation of coefficients of the model. Functions of tlie coeflkieiits such as tlie median lifetime are ...

Influential observations (IOs), which are outliers in the x direction, y direction or both, remain a problem classical regression model fitting. Spatial models have peculiar kind of because they local nature. also not free from effect influential observations. Researchers adapted some techniques to spatial and obtained satisfactory results. However, masking or/and swamping remains stumbling blo...

More than five hundred chemically injured patients were admitted to the Labbafi-Nejad Medical Center in Spring of 1984. These patients were of two groups. The majority of patients had extensive skin burns, eye injuries as well as respiratory problems, and a second group of patients suffered mainly from neuromuscular and psychological problems. In this report, clinical manifestation and obs...