TY - CHAP A1 - Kern, Alexander A1 - Dikta, Gerhard T1 - Probability of damage of electrical and electronic systems due to indirect lightning flashes - investigation of data from German insurance companies N2 - In the presented paper data collected from the field related to damage statistics of electrical and electronic apparatus in household are reported and investigated. These damages (total number approx. 74000 cases), registered by five German insurance companies in 2005 and 2006, were adviced by customers as caused by lightning overvoltages. With the use of stochastical methods it is possible, to reasses the collected data and to distinguish between cases, which are with high probability caused by lightning overvoltages, and those, which are not. If there was an indication for a direct strike, this case was excluded, so the focus was only on indirect lightning flashes, i.e. only flashes to ground near the structure and flashes to or nearby an incoming service line were investigated. The data from the field contain the location of damaged apparatus (residence of the policy holder) and the distances of the nearest cloud-to-ground stroke to the location of the damage registered by the German lightning location network BLIDS at the date of damage. The statistical data along with some complementary numerical simulations allow to verify the correspondence of the Standards rules used for IEC 62305-2 with the field data and to define some correction needs. The results could lead to a better understanding whether a damage reported to an insurance company is really caused by indirect lightning, or not. KW - Blitzschutz KW - lightning flash Y1 - 2009 ER - TY - JOUR A1 - Li, Anlan A1 - Shi, Young de A1 - Landsmann, B. A1 - Schankowski-Bouvier, P. A1 - Dikta, Gerhard A1 - Bauer, U. A1 - Artmann, Gerhard T1 - Hemorheology and walking distance of Peripheral Arterial Occlusive Disease patients during treatment with Ginkgo-biloba extract JF - Acta Pharmacologica Sinica = ZHONGUO YAOLI XUEBAO. 19 (1998), H. 5 Y1 - 1998 SN - 1745-7254 N1 - ISSN der parallelen Ausgabe 1671-4083; China-Zs.-Code: CN31-1347 abstract frei unter SP - 417 EP - 421 ER - TY - BOOK A1 - Dikta, Gerhard T1 - Kompakte und perfekte Maße Y1 - 1983 N1 - München., Univ., Diplomarbeit ER - TY - BOOK A1 - Dikta, Gerhard T1 - Beiträge zur nichtparametrischen Schätzung der Regressionsfunktion Y1 - 1987 N1 - Gießen, Univ., Diss. ER - TY - JOUR A1 - Dikta, Gerhard A1 - Kurtz, B. A1 - Stute, W. T1 - Sequential Fixed-Width Confidence Bands for Distribution Functions Under Random Censoring JF - Metrika. 36 (1989) Y1 - 1989 SN - 0026-1335 SP - 167 EP - 176 ER - TY - JOUR A1 - Dikta, Gerhard A1 - Kvesic, Marsel A1 - Schmidt, Christian T1 - Bootstrap Approximations in Model Checks for Binary Data JF - Journal of the American Statistical Association. 101 (2006), H. 474 Y1 - 2006 SN - 0162-1459 SP - 521 EP - 530 ER - TY - JOUR A1 - Dikta, Gerhard T1 - Time series methods to forecast patent filings JF - Forecasting innovations : methods for predicting numbers of patent filings ; with 71 tables / Peter Hingley ; Marc Nicolas (ed.), Y1 - 2006 SN - 978-3-540-35991-3 U6 - http://dx.doi.org/10.1007/3-540-35992-3_6 N1 - ISBN 3-540-35991-5 SP - 95 EP - 124 PB - Springer CY - Berlin [u.a.] ER - TY - JOUR A1 - Dikta, Gerhard T1 - Bootstrap Approximation of Nearest Neighbor Regression Function Estimates JF - Journal of Multivariate Analysis. 32 (1990), H. 2 Y1 - 1990 SN - 0047-259X SP - 213 EP - 229 ER - TY - JOUR A1 - Dikta, Gerhard A1 - Ghorai, J. K. T1 - Bootstrap Approximation with Censored Data under the Proportional Hazard Model JF - Communications in Statistics: Theory and Methods. 19 (1990), H. 2 Y1 - 1990 SN - 0361-0926 SP - 573 EP - 581 ER - TY - JOUR A1 - Dikta, Gerhard T1 - Asymptotic Normality Under the Koziol-Green Model JF - Communications in Statistics: Theory and Methods. 24 (1995), H. 6 Y1 - 1995 SN - 0361-0926 SP - 1537 EP - 1549 ER - TY - JOUR A1 - Dikta, Gerhard T1 - A Note on the Rate of Convergence of the Bootstrap JF - Journal of Approximation Theory. 75 (1993), H. 1 Y1 - 1993 SN - 0021-9045 SP - 112 EP - 114 ER - TY - JOUR A1 - Dikta, Gerhard T1 - On Semiparametric Random Censorship Models JF - Journal of Statistical Planning and Inference. 66 (1998), H. 2 Y1 - 1998 SN - 0378-3758 SP - 253 EP - 279 ER - TY - JOUR A1 - Dikta, Gerhard T1 - The Strong Law under Semiparametric Random Censorship Models JF - Journal of Statistical Planning and Inference. 83 (2000), H. 1 Y1 - 2000 SN - 0378-3758 SP - 1 EP - 10 ER - TY - JOUR A1 - Dikta, Gerhard A1 - Ghorai, Jugal A1 - Schmidt, Christian T1 - The Central Limit Theorem under Semiparametric Random Censorship Models JF - Journal of Statistical Planning and Inference. 127 (2005), H. 1 Y1 - 2005 SN - 0378-3758 SP - 23 EP - 51 ER - TY - JOUR A1 - Dikta, Gerhard T1 - Weak Representation of the Cumulative Hazard Function under Semiparametric Random Censorship Models JF - Statistics. 35 (2001), H. 4 Y1 - 2001 SN - 0233-1888 SP - 395 EP - 410 ER - TY - JOUR A1 - Dikta, Gerhard A1 - Hausmann, Rolf A1 - Schmidt, Christian T1 - Some Simulation Results under Random Censorship Models Y1 - 2002 N1 - gesehen 18.06.2007 SP - 1 EP - 12 ER - TY - JOUR A1 - Dikta, Gerhard A1 - Degenring, D. A1 - Froemmel, C. A1 - Takors, R. T1 - Sensitivity analysis for the reduction of complex metabolism models / Degenring, D. ; Froemmel, C. ; Dikta, G.; Takors, R. JF - Journal of Process Control. 14 (2004) Y1 - 2004 SN - 0959-1524 SP - 729 EP - 745 ER - TY - JOUR A1 - Kern, Alexander A1 - Dikta, Gerhard A1 - Krichel, Frank T1 - Zur Wahrscheinlichkeit für Schäden an elektrischen und elektronischen Einrichtungen durch indirekte Blitzeinschläge - Auswertung von Schadensstatistiken, analytischen und numerischen Berechnungen JF - 7. VDE-ABB-Blitzschutztagung : Vorträge der VDE-ABB-Fachtagung vom 15. bis 16. November 2007 in Neu-Ulm / Veranst.: Ausschuss für Blitzschutz und Blitzforschung (ABB) im VDE, Verband der Elektrotechnik, Elektronik, Informationstechnik e.V. Wiss. Tagungsltg.: K. Stimper Y1 - 2007 SN - 978-3-8007-3062-9 N1 - VDE-Fachbericht ; 64 ; Blitzschutztagung <7, 2007, Neu-Ulm> SP - 1 EP - 9 PB - VDE-Verl. CY - Berlin ER - TY - JOUR A1 - Artmann, Gerhard A1 - Digel, Ilya A1 - Zerlin, Kay A1 - Maggakis-Kelemen, Christina A1 - Linder, Peter A1 - Porst, Dariusz A1 - Kayser, Peter A1 - Stadler, David A1 - Dikta, Gerhard A1 - Temiz Artmann, Aysegül T1 - Hemoglobin senses body temperature JF - European Biophysics Journal Y1 - 2009 SN - 0175-7571 VL - 38 IS - 5 SP - 589 EP - 600 ER - TY - JOUR A1 - Kern, Alexander A1 - Dikta, Gerhard T1 - Bewerten von Schäden durch Blitzeinwirkungen JF - Elektropraktiker. 62 (2008), H. 4 Y1 - 2008 SN - 0013-5569 SP - 338 EP - 342 ER - TY - JOUR A1 - Dikta, Gerhard A1 - Subramanian, Sundarraman T1 - Inverse censoring weighted median regression / Sundarraman Subramanian and Gerhard Dikta JF - Statistical Methodology. 6 (2009), H. 6 Y1 - 2009 SN - 1572-3127 SP - 594 EP - 603 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Forst, Thomas A1 - Karagiannis, E. A1 - Lübben, G. A1 - Hohberg, C. A1 - Schöndorf, T. A1 - Dikta, Gerhard A1 - Drexler, M. A1 - Morcos, M. A1 - Dänschel, W. A1 - Borchert, M. A1 - Pfützner, A. T1 - Pleiotrophic and anti-inflammatory effects of pioglitazone precede the metabolic activity in type 2 diabetic patients with coronary artery disease JF - Atherosclerosis. 197 (2008), H. 1 Y1 - 2008 U6 - http://dx.doi.org/10.1016/j.atherosclerosis.2007.05.006 SN - 0021-9150 SP - 311 EP - 317 ER - TY - JOUR A1 - Musholt, Petra B. A1 - Schöndorf, Thomas A1 - Pfützner, Andreas A1 - Hohberg, Cloth A1 - Kleine, Iris A1 - Fuchs, Winfried A1 - Hehenwarter, Silvia A1 - Dikta, Gerhard A1 - Kerschgens, Benedikt A1 - Forst, Thomas T1 - Combined Pioglitazone and Metformin Treatment Maintains the Beneficial Effect of Short-Term Insulin Infusion in Patients with Type 2 Diabetes: Results from a Pilot Study JF - Journal of Diabetes Science and Technology. 3 (2009), H. 6 Y1 - 2009 SN - 1932-2968 SP - 1442 EP - 1450 PB - Sage Publishing CY - London ER - TY - JOUR A1 - Dikta, Gerhard T1 - The Bootstrap in Binary Model Diagnostics JF - Frontiers of applied and computational mathematics : New Jersey Institute of Technology, USA, 19 - 21 May 2008 ; [dedicated to Daljit Singh Ahluwalia on his 75th birthday ; Fifth Annual Frontiers in Applied and Computational Mathematics Conference (FACM '08) ; selection of papers] / ed. by Denis Blackmore Y1 - 2008 SN - 978-981-283-528-4 SP - 119 EP - 126 PB - World Scientific CY - Hackensack, NJ [u.a.] ER - TY - JOUR A1 - Atlas, Glen A1 - Brealey, David A1 - Dhar, Sunil A1 - Dikta, Gerhard A1 - Singer, Meryvn T1 - Additional hemodynamic measurements with an esophageal Doppler monitor: a preliminary report of compliance, force, kinetic energy, and afterload in the clinical setting JF - Journal of clinical monitoring and computing N2 - The esophageal Doppler monitor (EDM) is a minimally-invasive hemodynamic device which evaluates both cardiac output (CO), and fluid status, by estimating stroke volume (SV) and calculating heart rate (HR). The measurement of these parameters is based upon a continuous and accurate approximation of distal thoracic aortic blood flow. Furthermore, the peak velocity (PV) and mean acceleration (MA), of aortic blood flow at this anatomic location, are also determined by the EDM. The purpose of this preliminary report is to examine additional clinical hemodynamic calculations of: compliance (C), kinetic energy (KE), force (F), and afterload (TSVRi). These data were derived using both velocity-based measurements, provided by the EDM, as well as other contemporaneous physiologic parameters. Data were obtained from anesthetized patients undergoing surgery or who were in a critical care unit. A graphical inspection of these measurements is presented and discussed with respect to each patient’s clinical situation. When normalized to each of their initial values, F and KE both consistently demonstrated more discriminative power than either PV or MA. The EDM offers additional applications for hemodynamic monitoring. Further research regarding the accuracy, utility, and limitations of these parameters is therefore indicated. KW - Acceleration KW - Velocity KW - Kinetic energy KW - Force KW - Compliance KW - Afterload KW - Contractility KW - Volume status KW - Esophageal Doppler monitor Y1 - 2012 SN - 1573-2614 U6 - http://dx.doi.org/10.1007/s10877-012-9386-5 IS - 26 SP - 473 EP - 482 PB - Springer Nature CY - London ER - TY - CHAP A1 - Dikta, Gerhard T1 - Fundamentals of applied probability and basic statistics T2 - Critical care nephrology / [Hrsg.:] Claudio Ronco and Rinaldo Bellomo Y1 - 1998 SN - 978-94-010-6306-7 SP - 51 EP - 61 PB - Springer CY - Dordrecht ER - TY - JOUR A1 - Dikta, Gerhard T1 - Asymptotically efficient estimation under semi-parametric random censorship models JF - Journal of multivariate analysis N2 - We study the estimation of some linear functionals which are based on an unknown lifetime distribution. The observations are assumed to be generated under the semi-parametric random censorship model (SRCM), that is, a random censorship model where the conditional expectation of the censoring indicator given the observation belongs to a parametric family. Under this setup a semi-parametric estimator of the survival function was introduced by the author. If the parametric model assumption is correct, it is known that the estimated functional which is based on this semi-parametric estimator is asymptotically at least as efficient as the corresponding one which rests on the nonparametric Kaplan–Meier estimator. In this paper we show that the estimated functional which is based on this semi-parametric estimator is asymptotically efficient with respect to the class of all regular estimators under this semi-parametric model. Y1 - 2014 U6 - http://dx.doi.org/10.1016/j.jmva.2013.10.002 SN - 1095-7243 (E-Journal); 0047-259X (Print) VL - 124 SP - 10 EP - 24 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Dikta, Gerhard A1 - Kühlheim, René A1 - Mendonca, Jorge A1 - Una-Alcarez, Jacobo de T1 - Asymptotic representation of presmoothed Kaplan–Meier integrals with covariates in a semiparametric censorship model JF - Journal of Statistical Planning and Inference Y1 - 2015 U6 - http://dx.doi.org/10.1016/j.jspi.2015.12.001 SN - 0378-3758 VL - Vol. 171 SP - 10 EP - 37 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Dikta, Gerhard A1 - Reißel, Martin A1 - Harlaß, Carsten T1 - Semi-parametric survival function estimators deduced from an identifying Volterra type integral equation JF - Journal of multivariate analysis N2 - Based on an identifying Volterra type integral equation for randomly right censored observations from a lifetime distribution function F, we solve the corresponding estimating equation by an explicit and implicit Euler scheme. While the first approach results in some known estimators, the second one produces new semi-parametric and pre-smoothed Kaplan–Meier estimators which are real distribution functions rather than sub-distribution functions as the former ones are. This property of the new estimators is particular useful if one wants to estimate the expected lifetime restricted to the support of the observation time. Specifically, we focus on estimation under the semi-parametric random censorship model (SRCM), that is, a random censorship model where the conditional expectation of the censoring indicator given the observation belongs to a parametric family. We show that some estimated linear functionals which are based on the new semi-parametric estimator are strong consistent, asymptotically normal, and efficient under SRCM. In a small simulation study, the performance of the new estimator is illustrated under moderate sample sizes. Finally, we apply the new estimator to a well-known real dataset. KW - Volterra integral equation KW - Product-integration KW - Asymptotic efficiency KW - Semi-parametric random censorship model KW - Censored data KW - Survival analysis Y1 - 2016 U6 - http://dx.doi.org/10.1016/j.jmva.2016.02.008 IS - 147 SP - 273 EP - 284 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Dikta, Gerhard T1 - Semi-parametric random censorship models JF - From Statistics to Mathematical Finance : Festschrift in Honour of Winfried Stute Y1 - 2017 SN - 978-3-319-50986-0 U6 - http://dx.doi.org/10.1007/978-3-319-50986-0_3 SP - 43 EP - 56 PB - Springer CY - Berlin ER - TY - BOOK A1 - Dikta, Gerhard A1 - Scheer, Marsel T1 - Bootstrap Methods: With Applications in R N2 - This book provides a compact introduction to the bootstrap method. In addition to classical results on point estimation and test theory, multivariate linear regression models and generalized linear models are covered in detail. Special attention is given to the use of bootstrap procedures to perform goodness-of-fit tests to validate model or distributional assumptions. In some cases, new methods are presented here for the first time. The text is motivated by practical examples and the implementations of the corresponding algorithms are always given directly in R in a comprehensible form. Overall, R is given great importance throughout. Each chapter includes a section of exercises and, for the more mathematically inclined readers, concludes with rigorous proofs. The intended audience is graduate students who already have a prior knowledge of probability theory and mathematical statistics. Y1 - 2021 SN - 978-3-030-73480-0 U6 - http://dx.doi.org/10.1007/978-3-030-73480-0 PB - Springer CY - Cham ER - TY - JOUR A1 - Heel, Mareike van A1 - Dikta, Gerhard A1 - Braekers, Roel T1 - Bootstrap based goodness‑of‑fit tests for binary multivariate regression models JF - Journal of the Korean Statistical Society N2 - We consider a binary multivariate regression model where the conditional expectation of a binary variable given a higher-dimensional input variable belongs to a parametric family. Based on this, we introduce a model-based bootstrap (MBB) for higher-dimensional input variables. This test can be used to check whether a sequence of independent and identically distributed observations belongs to such a parametric family. The approach is based on the empirical residual process introduced by Stute (Ann Statist 25:613–641, 1997). In contrast to Stute and Zhu’s approach (2002) Stute & Zhu (Scandinavian J Statist 29:535–545, 2002), a transformation is not required. Thus, any problems associated with non-parametric regression estimation are avoided. As a result, the MBB method is much easier for users to implement. To illustrate the power of the MBB based tests, a small simulation study is performed. Compared to the approach of Stute & Zhu (Scandinavian J Statist 29:535–545, 2002), the simulations indicate a slightly improved power of the MBB based method. Finally, both methods are applied to a real data set. Y1 - 2021 U6 - http://dx.doi.org/10.1007/s42952-021-00142-4 SN - 2005-2863 (Online) SN - 1226-3192 (Print) N1 - Corresponding author: Mareike van Heel VL - 51 PB - Springer Nature CY - Singapur ER - TY - CHAP A1 - Hingley, Peter A1 - Dikta, Gerhard T1 - Finding a well performing box-jenkins forecasting model for annualised patent filings counts T2 - International Symposium on Forecasting, Thessaloniki, Greece, June 2019 Y1 - 2019 ER -