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  • 11
    Digitale Medien
    Digitale Medien
    AN ALTERNATING LEAST-SQUARES PROCEDURE FOR ESTIMATING MISSING PREFERENCE DATA IN PRODUCT-CONCEPT TESTING (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 17 (1986), S. 0 
    Details
    ISSN: 1540-5915
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: Product-concept testing is a popular activity in marketing research. Often the number of new product/service concepts under study far exceeds the time available for any single respondent. Respondents therefore may receive only a subset of the concepts comprising the total design. Researchers are interested in making plausible imputations for the missing evaluations of any given respondent.This paper proposes a model and an iterative estimation procedure to impute missing entries for each evaluator. The model and the procedure incorporate (1) the internal structure of the response matrix and (2) an ancillary matrix of (nonmissing) respondent background data; they also (3) allow for individual differences in respondents' uses of the numerical rating scale. The model is applied to both real and synthetic data. Suggestions also are given on how the data imputations may be used in market segmentation and product-line decisions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1540-5915.1986.tb00219.x
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  • 12
    Digitale Medien
    Digitale Medien
    Two Stochastic Multidimensional Choice Models for Marketing Research (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 21 (1990), S. 0 
    Details
    ISSN: 1540-5915
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Wirtschaftswissenschaften
    Notizen: Two recently developed probabilistic multidimensional models for analyzing pairwise choice data are introduced, discussed in terms of their differential properties, and extended in several ways. The first one, the wandering vector model, was originally suggested by Carroll [12] and extended by De Soete and Carroll [30]. The second model, called the wandering ideal point model, is a more recently proposed [32] unfolding analog of the wandering vector model. A general maximum likelihood estimation method for fitting the various models described is mentioned, as well as a statistical test for assessing the goodness of fit. Finally, an application of the models is provided concerning consumer choice for some 14 brands of over-the-counter analgesics to illustrate how such models can be gainfully utilized for marketing decision making concerning product positioning.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1540-5915.1990.tb01689.x
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  • 13
    Digitale Medien
    Digitale Medien
    PREDICTING LOCAL TRAVEL IN URBAN REGIONS (1957)
    Oxford, UK : Blackwell Publishing Ltd
    Papers in regional science 3 (1957), S. 0 
    Details
    ISSN: 1435-5957
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geographie , Wirtschaftswissenschaften
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1435-5597.1957.tb01599.x
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  • 14
    Digitale Medien
    Digitale Medien
    Radiation Damage in Lubricating Greases (1958)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 50 (1958), S. 217-220 
    Details
    ISSN: 1520-5045
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ie50578a040
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  • 15
    Digitale Medien
    Digitale Medien
    Radiolysis and Radiolytic Oxidation of Lubricants (1958)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 50 (1958), S. 221-228 
    Details
    ISSN: 1520-5045
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ie50578a041
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  • 16
    Digitale Medien
    Digitale Medien
    Individual Differences (1954)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Psychology 5 (1954), S. 127-148 
    Details
    ISSN: 0066-4308
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Psychologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ps.05.020154.001015
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  • 17
    Digitale Medien
    Digitale Medien
    Individual Differences in Cognitive Abilities (1979)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Psychology 30 (1979), S. 603-640 
    Details
    ISSN: 0066-4308
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Psychologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ps.30.020179.003131
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  • 18
    Digitale Medien
    Digitale Medien
    Multidimensional Scaling (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Psychology 31 (1980), S. 607-649 
    Details
    ISSN: 0066-4308
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Psychologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ps.31.020180.003135
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  • 19
    Digitale Medien
    Digitale Medien
    Spectrally agile far-infrared detector using an n-i-p-i superlattice (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 956-960 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We propose a spectrally agile far-infrared detector based on an InSb n-i-p-i superlattice. We show that the spectral response of the detector can be tuned with an applied electrical bias that modulates the tunneling-assisted interband absorption coefficient by changing the internal electric fields. Calculations for several possible superlattice designs are presented and the limitation on the design parameters imposed by the tunneling current is discussed. It is shown that the detector can distinguish between blackbodies with temperatures in the range of 200–400 K independent of the distance between the object and the detector. We also present a simple discussion of the response time that can be expected from such a detector and of the noise sources that will limit its performance.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343471
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  • 20
    Digitale Medien
    Digitale Medien
    Anaesthesia equipment malfunction (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 40 (1985), S. 0 
    Details
    ISSN: 1365-2044
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Anaesthetic equipment was studied to determine whether the accuracy was improved and failure rate decreased by routine maintenance and calibration by a biomedical technician. Each piece was evaluated, and then repaired and rechecked at intervals by the same technician. Equipment failures were divided into three types: first, equipment that was completely nonfunctional; second, equipment that was functional but inaccurate; and third, equipment that was functional and accurate but needed minor repairs. The percentage of equipment failures in each group was compared on initial evaluation and after 6 months. Of the 311 pieces of equipment, 40% needed repair at the time of the initial survey; 8% was nonfunctional, and 18% was functional but inaccurate. After six months on a maintenance schedule, only 15% of the equipment needed repair, 3% was nonfunctional, and 6% was functional but inaccurate. The difference between the total percentage of equipment failure initially and after six months was statistically significant. After a regular maintenance, calibration, and checkout schedule by a biomedical technician was instituted, there was a significant improvement in the accuracy of the equipment and a reduction in the percentage of equipment needing repair.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2044.1985.tb10505.x
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