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    Wyświetlanie 1-4 z 4
    Tytuł:
    Inflacja i względna zmienność cen w Polsce
    Inflation and Relative Price Volatility in Poland
    Autorzy:
    Hoffmann, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/2083990.pdf
    Data publikacji:
    2022
    Wydawca:
    Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
    Tematy:
    inflacja
    relatywna zmienność cen
    oczekiwania inflacyjne
    inflacja zasadnicza
    inflacja bazowa
    regresja liniowa i wielomianowa
    inflation
    relative price volatility
    inflation expectations
    headline inflation
    core inflation
    linear and polynomial regression
    Opis:
    Artykuł przedstawia wyniki badań dotyczące wpływu inflacji na względną zmienność cen na podstawie danych z Polski z okresu 2011 Q3-2020 Q4. W celu zbadania tego związku wykorzystywano dane CPI dla 12 głównych grup koszyka inflacyjnego. Estymacje wykazały, iż w przypadku inflacji nieoczekiwanej zauważalny jest jej znaczący wpływ na ruchy RPV, czego z kolei nie można dostrzec w przypadku inflacji oczekiwanej. Co więcej, forma funkcjonalna wskazuje na zależność w kształcie litery „U” w przypadku relacji RPV i inflacji nieoczekiwanej. Wykorzystanie ankietowych miar prognozowanej inflacji pozwala na uzyskanie kompleksowego spojrzenia na zjawisko pomiędzy RPV a inflacją. Słowa kluczowe: inflacja, relatywna zmienność cen, oczekiwania inflacyjne, inflacja zasadnicza, inflacja bazowa, regresja liniowa i wielomianowa.
    This article presents the results of the impact of inflation on relative price volatility based on data from Poland in the period 2011 Q3-2020 Q4. In order to investigate this relationship, CPI data for 12 main groups of the inflation basket are used. The estimates showed that in the case of unexpected inflation, its significant impact on the RPV movements is noticeable, which, in turn, cannot be noticed in the case of expected inflation. Moreover, the functional form indicates a U-shaped relationship in the case of the RPV relation and unexpected inflation. The use of survey measures of forecasted inflation allows for a comprehensive view of the relation between the RPV and inflation.
    Źródło:
    Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu; 2022, 66, 2; 47-61
    1899-3192
    Pojawia się w:
    Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Brand position in the eyes of customers: assessment of selected airlines by the passengers online reviews
    Autorzy:
    Hoffmann, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/16729698.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    data mining
    text mining
    branch
    brand
    opinion
    R
    client
    airline
    sentiment analysis
    Opis:
    Motivation: The motivation to write an article on airlines was the desire to rank them based on customer reviews and see how these reviews reflect the actual brand image. The opinions that companies collect about themselves have a very strong power when it comes to building its reputation. Aim: The aim of the study was to use digital transformation and transform raw data into specific information that expressed customer emotions to create a profile of selected airlines. A secondary goal of the article was also to check how the analyzed airlines perform in similar areas. Materials and methods: The data used for the analysis was collected from the eSky.com website and covers the 2019-2020 period. The airlines concerned by the customer reviews were LOT, Ryanair, Wizzair, Czarter, EasyJet, Lufthansa and Laudamotion. Their selection was dictated by the number of opinions necessary to conduct the analysis. The research based on the use of data mining techniques, but it should be noted that most of it uses text mining tools. Topic modelling was used to prepare the data properly and assign each word to groups with similar themes. In order to obtain information whether a given opinion has a positive, negative or neutral tenor, sentiment analysis was used. The final part of the analysis was based on the net sentiment score indicator. The entire analysis was carried out in the R-Studio. Results: The most common subjects of opinions written by customers were "delay", "service", "boarding" and "airline". It was confirmed that the opinions of each airline concern different topics, although some common topics were noticeable. Two topics were repeated among the 7 analyzed airlines: "service" and "delay". Based on the sentiment analysis, for the Ryanair airline the percentage of negative opinions was highest and equal to 35%, almost 40%, of neutral opinions fell on the WizzAir airline and the largest percentage of positive feedback, as much as 46%, was attributed to EasyJet. EasyJet line looks the best in the eyes of customers. The line that evoked uniformly positive, negative and neutral emotions in the opinions was Ryanair.
    Źródło:
    Catallaxy; 2022, 7, 1; 7-21
    2544-090X
    Pojawia się w:
    Catallaxy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Leader Programme as an Impulse for New Projects in Rural Areas
    Autorzy:
    Hoffmann, Robert
    Hoffmann, Natalia
    Powiązania:
    https://bibliotekanauki.pl/articles/1051457.pdf
    Data publikacji:
    2018-06-15
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Local Action Group (LAG)
    LEADER
    Polska
    Rural Development Programme (RDP)
    Opis:
    The article aims to present the stages of the LEADER programme and its influence on greater activity and integration of inhabitants by, e.g. extending the knowledge of tradition and national heritage and the actions intended for the integration of local communities. It is noticeable particularly in the implementation of the activities within Axis 4 of the 2007–2013 Rural Development Programme. Positive changes in rural areas are a result of building strong social and human capitals, which are important factors of local development. The skills and the ability for cooperation of a local community allows it to implement many projects. The investments made by beneficiaries of the LEADER programme improve the level of living and the quality of life in the countryside. The effect is an improvement in physical infrastructure and tourist attractiveness as a result of care for the rural landscape and cultural heritage. The implementation of the LEADER programme is presented on the example of Wielkopolskie Voivodeship where the participation in actions for local communities is deeply ingrained. In order to show spatial differences in the activity of local entities under Local Action Groups in Wielkopolskie Voivodeship, classes were selected on the basis of funds received by local entities in the LAG areas. There are 36 Local Action Groups operating in Wielkopolska (of which 31 have seats in this region).
    Źródło:
    Quaestiones Geographicae; 2018, 37, 2; 141-150
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    How short RNAs impact the human ribonuclease Dicer activity: putative regulatory feedback-loops and other RNA-mediated mechanisms controlling microRNA processing
    Autorzy:
    Koralewska, Natalia
    Hoffmann, Weronika
    Pokornowska, Maria
    Milewski, Marek
    Lipinska, Andrea
    Bienkowska-Szewczyk, Krystyna
    Figlerowicz, Marek
    Kurzynska-Kokorniak, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1038739.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    ribonuclease Dicer
    miRNA processing
    regulatory RNAs
    regulation of Dicer activity
    regulatory feedback-loops
    Opis:
    Ribonuclease Dicer plays a pivotal role in RNA interference pathways by processing long double-stranded RNAs and single-stranded hairpin RNA precursors into small interfering RNAs (siRNAs) and microRNAs (miRNAs), respectively. While details of Dicer regulation by a variety of proteins are being elucidated, less is known about non-protein factors, e.g. RNA molecules, that may influence this enzyme's activity. Therefore, we decided to investigate the question of whether the RNA molecules can function not only as Dicer substrates but also as its regulators. Our previous in vitro studies indicated that the activity of human Dicer can be influenced by short RNA molecules that either bind to Dicer or interact with its substrates, or both. Those studies were carried out with commercial Dicer preparations. Nevertheless, such preparations are usually not homogeneous enough to carry out more detailed RNA-binding studies. Therefore, we have established our own system for the production of human Dicer in insect cells. In this manuscript, we characterize the RNA-binding and RNA-cleavage properties of the obtained preparation. We demonstrate that Dicer can efficiently bind single-stranded RNAs that are longer than ~20-nucleotides. Consequently, we revisit possible scenarios of Dicer regulation by single-stranded RNA species ranging from ~10- to ~60-nucleotides, in the context of their binding to this enzyme. Finally, we show that siRNA/miRNA-sized RNAs may affect miRNA production either by binding to Dicer or by participating in regulatory feedback-loops. Altogether, our studies suggest a broad regulatory role of short RNAs in Dicer functioning.
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 4; 773-783
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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