Acta Universitatis Lodziensis. Folia Oeconomica nr 227/2009
http://hdl.handle.net/11089/7005
METODY ILOŚCIOWE W GLOBALNEJ GOSPODARCE2022-01-26T04:19:49ZO wyznaczaniu kwantyli rozkładu w szeregach rozdzielczych przedziałowych
http://hdl.handle.net/11089/7033
O wyznaczaniu kwantyli rozkładu w szeregach rozdzielczych przedziałowych
Jurkiewicz, Tomasz
Interval frequency distributions used as a secondary data do not provide full information
about the distribution of the variable of interest. In order to estimate quantiles, it
is common to use one of interpolation formulae based on the assumption that the distribution
of the variable is uniformly distributed in each interval. This assumption, if not
met, may result in large bias. Author suggests using different formulae, which do not require uniform distribution
in intervals, and depend on the frequencies of neighbouring intervals. Simulation experiments
were applied for the normal and lognormal distributions to assess efficiency of
both kinds of interpolation formulae. Different population sizes and different numbers of
intervals in the frequency distribution were also considered.
2009-01-01T00:00:00ZOrganizacja wywiadu z kwestionariuszem ankietowym do badania jakości usług
http://hdl.handle.net/11089/7032
Organizacja wywiadu z kwestionariuszem ankietowym do badania jakości usług
Olbrych, Barbara
The article focuses on organization of a direct interview with a survey questionnaire
to conduct research into quality of services provided by the HELIOS Film Centre in
Radom. The factors which may influence customer satisfaction are identified, a quality
evaluation map has been constructed and the satisfaction indicator has been calculated.
On the basis of a pilot sample the survey questionnaire has been tested as well as the IPA
technique, which was used for the analysis of services of this institution for the first
time. The results obtained are a starting point for fundamental research which requires
separate development.
2009-01-01T00:00:00ZO wyznaczaniu dominanty rozkladu cechy ciągłej w szeregach szczegółowych
http://hdl.handle.net/11089/7031
O wyznaczaniu dominanty rozkladu cechy ciągłej w szeregach szczegółowych
Jurkiewicz, Tomasz; Kozłowski, Arkadiusz
One of the main descriptive characteristics is the mode. For continuous variables it
is not always easy to properly determine the mode. There are some estimates of the
mode provided in literature, however, unlike the median or the arithmetic mean, for the
mode there does not exist the estimator which would be commonly considered as the
best one. Moreover, in many statistical textbooks and computer packages this problem
seems to be ignored.
In this paper authors consider seven different methods of estimation the mode presented
in literature. The efficiency of the estimation procedures has been evaluated on
the basis simulation experiments for the normal and lognormal distributions with different
degrees of skewness. The evaluation criteria of those procedures involve not only the
efficiency of estimation but also simplicity of computation, which is an important aspect
of teaching statistics.
2009-01-01T00:00:00ZNowe koncepcje wprowadzania całek oznaczonych uniwersyteckich wykładach matematyki
http://hdl.handle.net/11089/7030
Nowe koncepcje wprowadzania całek oznaczonych uniwersyteckich wykładach matematyki
Kupczun, Janusz
The purpose of this paper is a brief discussion of some recent ideas, that could be
useful for more intuitive and more modern teaching of calculus (i.e. mathematical analysis).
I limited myself to the fundamental concepts of integrals. However my intention
was to contribute to elucidations of many similar topics. In my opinion, now is the time
of change of form and contents, of many routine and often boring courses.
2009-01-01T00:00:00Z