4,600,171 research outputs found
Estimation of missing data in a geophysical series of precipitation
No full textThe analysis of dynamic systems is a topic of great interest in the basic sciences since it allows direct inference of the behavior of different systems. The study of physical phenomena provides large databases that, if recorded at regular time intervals, constitute time series. However, time series of geophysical data in many cases present missing data and their estimation requires the application of valid methods that allow estimating reliable information to complete the series since some analysis methods require these series to be complete. Two methods are used in this article to estimate the missing values of the precipitation series in the city of San José de Cúcuta, Colombia, the first one consists of considering the univariate data series and applying an adjustment of the sequential conditional expectation method of forecasting with restrictions, the second one refers to analyze the data series of a nearby station and through multivariate methods establish the cointegration between the series, and then use this as a basis for estimating the missing data in the analysis series. The two methods are recursive, a first estimation of the model is made ignoring the missing data, an initial estimation of the missing data is made, then a new estimation of the model parameters and a new estimation of the missing data is made, the algorithm continues running with the new values replacing the values estimated in the previous phase until the difference of the estimated values between successive iterations is less than a value fixed beforehand. Finally, a comparison is made between the estimates made by the two methods
Rent - seeking trade policy : a time series approach
Get PDFUsing a time-series approach, the author analyzes the relationship between the extent of rent-seeking trade policy and both political and economic variables. For rent-seeking trade policy, the indicator he uses is the number of foreign-trade regulations passed each year for the benefit of a single firm or industry. The author uses data from Uruguay for 1925-83. Uruguay, which experienced an impressive economic decline, is an outstanding example of a rent-seeking society. After being a wealthy economy in midcentury, it suffered almost complete stagnation, which led to social and policital disintegration by the end of the 1960s. Three decades of restrictive regulations on foreign trade had created a nearly closed economy by the end of the 1960s. It was worth analyzing whether policymakers'great receptiveness to demands for protection could account for Uruguay's decline. Over the period 1925-83, the author finds almost 4,000 laws, decrees, and administrative resolutions that create, maintain, or modify a foreign-trade regulation for the benefit of a single firm or industry. About half of them explicitly identify the petitioner - usually a firm or guild. Since the size of the Uruguayan economy changed over the period studied, the author scales the annual number of regulations by output or exports to measure the extent of rent-seeking trade policy. The author shows that the extent of rent-seeking trade policy increased with discretionary policies and under dictatorship. (In the period studied, there were two stages of democracy - until 1932 and from 1943-72 - and two stages of dictatorship.) He also shows that rent-seeking trade restrictions increased under import-substitution strategies and, more unexpectedly, under active export promotion. This suggests that discretionary power leads to wasteful distribution, whether it is used to support inward- or outward-oriented policies. Finally, the author analyzes the correlation between innovations in the trade policy indicator and innovations in the growth rates of output and exports, with a lag of up to 20 years. Surprisingly, he finds a positive correlation with output growth rates after two or three years. But the correlation becomes negative some years later, particularly in the case of exports. The short-run positive impact on growth rates, together with the surprisingly long time lag before the negative impact, may account for policymakers'receptiveness to demands for protection.Trade Policy,Achieving Shared Growth,TF054105-DONOR FUNDED OPERATION ADMINISTRATION FEE INCOME AND EXPENSE ACCOUNT,Economic Theory&Research,Environmental Economics&Policies
19771110: Artists Series, 1936-1971
Get PDFThese items include materials from the office of the Artist Series at Marshall University from 21936-1971. Items were received in 1977 and include notable materials from or about program brochures the Artist Series produced. Please download the finding aid for a full list of contents
Dr. Mark Ellingsen, ITC, November 2011
No full textThis video is a conversation with Dr. Mark Ellingsen. Dr. Ellingsen talks about his book, "Lectionary Preaching Workbook, Series IX, Cycle B". Brad Ost, AUC Woodruff Library, is the interviewer
20240201: Marshall Artists Series, 2014-2016
Get PDFThese items include materials from the Artists Series at Marshall University from 2014-2016. Items were received in 2024 and include the programs brought to Marshall via the Artists Series, posters, and newspaper clippings from 1960. Please download the inventory for a full list of materials
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
20150708.1: Marshall Artists Series, 1990-1992
Get PDFThese items include materials from the office of the Artists Series at Marshall University from 1990-1992. Items were received in 2015 and include notable materials from or about program brochures the Artist Series produced. This is not an exhaustive list. Please download the finding aid for a full list of contents
Fractional integration and cointegration in US financial time series data
Get PDFThis paper examines several US monthly financial time series data using fractional
integration and cointegration techniques. The univariate analysis based on fractional
integration aims to determine whether the series are I(1) (in which case markets might
be efficient) or alternatively I(d) with d < 1, which implies mean reversion. The
multivariate framework exploiting recent developments in fractional cointegration
allows to investigate in greater depth the relationships between financial series. We
show that there exist many (fractionally) cointegrated bivariate relationships among the variables examined.The second-named author gratefully acknowledges financial support from the Ministerio de Ciencia y Tecnología (ECO2008-03035 ECON Y FINANZAS, Spain) and from a PIUNA Project of the University of Navarra
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