ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00469.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00470.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

SummaryThis paper contains a report on the examination for “Statistisch Analist (Alge‐meen Gedeelte)” 1965, sponsored by the “Vereniging voor Statistiek”. It presents the examination problems and brief

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00471.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

SummaryIn an earlier paper by J.C. A. ZAAT an interrupted Poisson process was studied. Here we clarify some of the results there obtained. The process is obtained from a stationary Poisson process on the real axis by covering the axis with a sequence of adjoining intervals which have alternatively length a and b, the first left‐hand endpoint of an a‐interval to the right of 0 being chosen in a stochastic pointn̈ withn̈

摘要:

SummaryIn constructing a price index of new motorcars the main problem is how to deal with the introduction of new models and with quality variation generally. The first difficulty is turned by compiling year‐to‐year indices based on models that each account for 2 per cent or more of total sales in either year. The shifting basis of these indices comprises from 7 to 15 models which together account for 45 to 70 per cent of total registrations. All models are subject to minor improvements; this quality variation is taken into account by representing increases in horse power and overall length by equivalent price reductions. The elasticity coefficients involved in this translation are derived from a cross section analysis of prices and technical characteristics of some fifty widely ranging models in 1964.A price index for the period from 1950 to 1965 is then obtained by linking successive year‐to‐year indices. Over the whole period list prices have risen by a third, to a large extent as the result of changes in purchase tax; this price rise is just about offset by imporvements in quality of some 2 per cent pe

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00473.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

SummaryThe life distribution of motorcars is examined over the period from 1950 to 1964. Age‐specific survival rates, derived from Dutch registrations, are averaged and lead to the life table shown in table 4. The deviations from average age‐specific survival rates show no significant variation over time nor over successive car generations. Since the registrations include an increasing number of used cars imported from Germany this apparent stability hides compensating changes in car scrap page.Since before the war the life expectancy of motorcars has increased from 8 to 11 years, and it is argued that this is due to the widening of the used car market. In the next stage, which is already well under way in Germany, new cars replace used cars, and rising apparent scrappage rates reflect the disposal of the latter by exp

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00474.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

SummaryThis paper, read in Utrecht on October 14th 1965, deals with the average occupancy of cars outside urban areas. During the years 1962 and 1963 more than 500 samples (each consisting of 150 cars) have been taken on two points of the dutch road‐system. The samples covered the different months, days (sundays, Saturdays and week‐days) and hours (except those without daylight).The average occupancy turned out to be 1.8 on week‐days (with a minimum of 1.4), 2.5 on Saturdays (with a minimum of 2.1) and 3.1 on Sundays (the over‐all average for all days being 2.1). These results seem to be representative for the whole dutch car traffic as is shown by comparison with observations on other points and other data.Comparison of the seasonal, weekly and hourly patterns of the average occupancy with those of the car traffic density enable to draw conclusions about the responsibility of different kinds of traffic (commercial and commuter traffic versus social traffic) for congestion and for the construction and maintenance cost of the road

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00475.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

SummaryFor the sake of efficiency, the use of simplified formulae in item analysis is recommended. For adequate use of such formulae the systematic error must be known. For two important formulae this error is estimated: the KUDER‐RICHARD‐SON‐21 (instead of 20) and a formula for the correction of the spurious part‐whole correlation.As for the KR, if itemscores are 1 andO, the KR20 is given in (I) and the KR21 in (2). The difference dr between them, given in (5), is directly proportional to the variance of the itemdifficulties. This variance turns out to be rarely greater than 0,05. If the distribution of itemdifficulties is unimodal, a value greater than 0,05 is indeed improbable in four‐choice tests. The KR21, which does not need an item analysis, can be used as a substitute of the KR20. The KR21 coefficient itself is an lower limit, the KR21 plus dr ‐ estimated by (6) ‐ a probable upper limit of the KR20 coefficient.The part‐whole correlation of tests is spurious. If one wants to correct for this spuriousness it is theoretically preferable to estimate the part‐parallel test correlation instead ofthe part rest correlation. This is done here with the assumptions of classical test theory. The part‐parallel test correlation is given in (12), the easily computed first approximation, called A, in (13) and the second approximation in (75), in which last formula the corrected correlation is expressed as a function of A, the standard deviations of part and whole, and the reliability of the test. One can compute with this formula a maximum A, below which the first approximation is s

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00476.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY

摘要:

Multivariate analysis for biologists, HILARY L. SEALRandom Variables and Probability Distributions, H. CRAMERHandbook of Nonparametric Statistics II, (Results for Two and Several |Sample| Problems, Symmetry, and Extremes), JOHN E. WALSHLinear Programming, Second Edition, SAUL I. GASSApplications de la statistique a la demographie et a la biologie, R. RISSER, C. E. TRAYNARDStatistical Analysis, Ideas and method, D. VERNON LEWISA guide to Fortran IV programming, DANIEL D. MC. CRACKENHandboek der Wiskunde, Hoofdstuk XIV: Waarschjjnlijkheidsrekening en Statistiek. J. HEMELRUKIntroduction to the theory of queues, L. TAKÁCSElements of queueing theory, T. L. SAATYLes phénomènes attente, A. KAUFMANN&CRUONProceedings of the Symposium on Time Series Analysis held at Brown UniversityMethod of Statistical Testing, edited by Y. A. SHREIDERA Manager's Guide to Operational Research, PATRICK RIVETT and RUSSELL L. ACKOFFMéthodes statistiques à l'usage des médecins et des biologistesProceedings Fourth Berkeley Symposium, Volume IIConferences on Statistics 1962‐1963, J. HENRIPIN and A. ASIMAKOPULOSStochastic service systems, J. RIORDANLes systèmes avec ou sans attente et les processus stochastiquesGeneral stochastic processes in the theory

ISSN:0039-0402    

DOI:10.1111/j.1467-9574.1966.tb00477.x

出版商:Blackwell Publishing Ltd    

年代:1966

数据来源: WILEY