WorldCat Identities

Fleischer, F.

Overview
Works: 7 works in 10 publications in 2 languages and 42 library holdings
Roles: Editor, Author, Recipient
Publication Timeline
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Most widely held works about F Fleischer
 
Most widely held works by F Fleischer
Langzeiterprobung des Diagnose- und Trendsystems für Zweitakt-Schiffsdieselmotoren : Abschlußbericht ; Abschlußdatum des Vorhabens 31.12.1988 ; Contract MTK0398B0 by Günter Reinhold( Book )

2 editions published in 1989 in German and held by 2 WorldCat member libraries worldwide

Block bootstrap methods for the estimation of the intensity of a spatial point process with confidence bounds( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

This paper deals with the estimation of the intensity of a planar point process on the basis of a single point pattern, observed in a rectangular window. If the model assumptions of stationarity and isotropy hold, the method of block bootstrapping can be used to estimate the intensity of the process with confidence bounds. The results of two variants of block bootstrapping are compared with a parametric approximation based on the assumption of a Gaussian distribution of the numbers of points in deterministic subwindows of the original pattern. The studies were performed on patterns obtained by simulation of well-known point process models (Poisson process, two Matérn cluster processes, Matérn hardcore process, Strauss hardcore process). They were also performed on real histopathological data (point patterns of capillary profiles of 12 cases of prostatic cancer). The methods are presented as worked examples on two cases, where we illustrate their use as a check on stationarity (homogeneity) of a point process with respect to different fields of vision. The paper concludes with various methodological discussions and suggests possible extensions of the block bootstrap approach to other fields of spatial statistics
Brieven van Em. Querido's Uitgeverij, Amsterdam aan Colour Workshop Limited Hertford gericht aan F. Fleischer by Em. Querido's Uitgeverij (Amsterdam)( )

in Undetermined and held by 1 WorldCat member library worldwide

Ancient mountain people by F Fleischer( Book )

1 edition published in 1996 in English and held by 1 WorldCat member library worldwide

Das schwäbische Handwerkermuseum : Informationen für Lehrer der Grund- und Hauptschulen ; mit Arbeitsblättern by F Fleischer( Book )

1 edition published in 1990 in German and held by 1 WorldCat member library worldwide

Characterization of squamous cell carcinomas of the head and neck using methods of spatial statistics( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

In the present study, 53 cases of squamous cell carcinomas of the head and neck were characterized by a quantitative histological texture analysis based on principles of spatial statistics. A planar tessellation of the epithelial tumour component was generated by a skeletonization algorithm. The size distribution of the virtual cells of this planar tessellation, and the size distribution of the profiles of the tumour cell nuclei were estimated in terms of area and boundary length. The intensity, the reduced second moment function (K-function) and the pair correlation function of the point process of the centroids of the profiles of the tumour cell nuclei were also estimated. For both purposes, it is necessary to correct for edge effects, which we consider in this paper in some detail. Specifically, the point patterns of the tumour cell nuclei were considered as realizations of a point process, where the points exist only in the epithelial tumour component (the permitted phase) and not in the stroma (the forbidden phase). The methods allow to characterize each individual tumour by a series of summary statistics. The total set of cases was then partitioned into two groups: 19 cases without lymph node metastases (pN0), and 34 nodal positive cases (pN1 or pN2). Statistical analysis showed no significant differences between the intensities, the mean K-functions and the mean pair correlation functions of the tumour cell nucleus profiles of the two groups. However, there were some significant differences between the sizes of the virtual cells and of the nucleus profiles of the nodal negative cases as compared to the nodal positive cases. In a logistic regression analysis, one of the quantitative nuclear size variables (mean nuclear area) was found to be a significant predictor of lymph node metastasis, in addition to tumour stage. The study shows the potential of methods of spatial statistics for objective quantitative grading of squamous cell carcinomas of the head and neck, and provides an example for modelling histological point patterns as realizations of planar point processes occupying a reference phase which is only a partial component of the total tissue
 
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