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Träfflista för sökning "WFRF:(Andersson Michael) ;mspu:(publicationother)"

Search: WFRF:(Andersson Michael) > Other publication

  • Result 1-10 of 22
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1.
  • Andersson, Michael K., et al. (author)
  • Bootstrap testing for fractional integration
  • 1998
  • Other publication (other academic/artistic)abstract
    • Asymptotic tests for fractional integration, such as the Geweke-Porter-Hudak test, the modified rescaled range test and Lagrange multiplier type tests, exhibit size distortions in small samples. This paper investigates a parametric bootstrap testing procedure, for size correction, by means of a computer simulation study. The bootstrap provides a practical method to eliminate size distortions in the case of an asymptotic pivotal statistic while the power, in general, is close to the corresponding size adjusted asymptotic test. The results are very encouraging and suggest that a bootstrap testing procedure does correct for size distortions.
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2.
  • Andersson, Michael K. (author)
  • On the effects of imposing or ignoring long memory when forecasting
  • 1998
  • Other publication (other academic/artistic)abstract
    • Since the true nature of a time series process is often unknown it is important to understand the effects of model choice. This paper examines how the choice between modelling stationary time series as ARMA or ARFIMA processes affects the accuracy of forecasts. This is done, for first-order autoregressions and moving averages and for ARFIMA(l,d,O) processes, by means of a Monte Carlo simulation study. The fractional models are estimated using the technique of Geweke and Porter-Hudak, the modified rescaled range and the maximum likelihood procedure. We conclude that ignoring long memory is worse than imposing it, when forecasting, and that the ML estimator is preferred.
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3.
  • Andersson, Michael K., et al. (author)
  • Robust testing for fractional integration using the bootstrap
  • 1998
  • Other publication (other academic/artistic)abstract
    • Asymptotic tests for fractional integration are usually badly sized in small samples, even for normally distributed processes. Furthermore, tests that are well-sized (under normality) may be seriously distorted by non-normalities and ARCH errors. This paper demonstrates how the bootstrap can be implemented to correct for such size distortions. It is shown that a well-designed bootstrap test based on the MRR and GPH tests is exact, and that a procedure based on the REG test is nearly exact. Ort, förlag, år, upplaga, sidor
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  • Ekeberg, Tomas, 1983-, et al. (author)
  • Three-dimensional structure determination with an X-ray laser
  • Other publication (other academic/artistic)abstract
    • Three-dimensional structure determination of a non-crystalline virus has been achieved from a set of randomly oriented continuous diffraction patterns captured with an X-ray laser. Intense, ultra-short X-ray pulses intercepted a beam of single mimivirus particles, producing single particle X-ray diffraction patterns that are assembled into a three-dimensional amplitude distribution based on statistical consistency. Phases are directly retrieved from the assembled Fourier distribution to synthesize a three-dimensional image. The resulting electron density reveals a pseudo-icosahedral asymmetric virion structure with a compartmentalized interior, within which the DNA genome occupies only about a fifth of the volume enclosed by the capsid. Additional electron microscopy data indicate the genome has a chromatin-like fiber structure that has not previously been observed in a virus. 
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  • Result 1-10 of 22
Type of publication
other publication  (22)Undo refine
Type of content
other academic/artistic (19)
pop. science, debate, etc. (3)
Author/Editor
Andersson, Dan I. (4)
Grennberg, Helena (3)
Andersson, Claes-Hen ... (3)
Andersson, Michael K ... (3)
Lindberg, A Michael (2)
Andersson, Björn (2)
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Gredenhoff, Mikael P ... (2)
Edman, Kjell (2)
Andersson, Linus, 19 ... (1)
Näsvall, Joakim (1)
Ehrenberg, Måns (1)
Brismar, Hjalmar (1)
Lundin, Erik (1)
Lundeberg, Joakim (1)
Lagergren, Jens (1)
Hartman, Johan (1)
Granlund, Mats (1)
Andersson, B. (1)
Hallböök, Finn (1)
Andersson, Karl (1)
Stage, Jesper (1)
Önfelt, Björn (1)
Andersson, Leif (1)
Aquila, Andrew (1)
Schelén, Olov (1)
Graafsma, Heinz (1)
Hirsemann, Helmut (1)
Allander, T (1)
Allander, Tobias (1)
Hajdu, Janos (1)
Erk, Benjamin (1)
Rudenko, Artem (1)
Rolles, Daniel (1)
Andersson, Camilla (1)
Kullander, Klas (1)
Düsterer, Stefan (1)
Toleikis, Sven (1)
Treusch, Rolf (1)
Nilsson, Michael (1)
Andersson, Alma (1)
Frisen, Jonas (1)
Engblom, Camilla (1)
Nordin, Steven, 1960 ... (1)
Andersson, Inger (1)
Andersson, Siv GE (1)
Claeson, Anna-Sara, ... (1)
Andersson-Svahn, Hel ... (1)
Huus, Karina, 1968- (1)
Andreasson, Jakob (1)
Liang, Meng (1)
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University
Uppsala University (10)
Stockholm School of Economics (3)
Linnaeus University (3)
Royal Institute of Technology (2)
Luleå University of Technology (2)
Umeå University (1)
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Jönköping University (1)
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Language
English (21)
Swedish (1)
Research subject (UKÄ/SCB)
Natural sciences (13)
Medical and Health Sciences (3)
Social Sciences (1)

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