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Examining Statistical Distributions and Statistical Behavior of Stem Tapers of Fagus Sylvatica in Municipal Forest of Naoussa
No full textThe aim of the present research is the study of the statistical behavior of ninety-three tapers. Tapers are classified into three categories depending on whether they use measured diameters at relative or absolute heights in the tree trunk. In each taper, measures of central tendency, measures of dispersion and a measure of skewness were examined. Each taper was examined if it fits normal distribution or not. It emerged that in the first category all tapers approached the normal distribution. In the second category, eight of the ten tapers are satisfactorily reaching the normal distribution, while in the third category thirty-seven out of seventy-eight are satisfactorily reaching the normal distribution. Data used in the research were collected in the Municipal Forest of Naoussa from 300 trees of Fagus sylvatica using random sampling
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
Volume tables and tapers
No full textStem is a dynamic part of tree. Stem affects total growth of tree, the economic value and the status of the tree in a cluster. Taper is the term used to describe the decrease in tree stem diameter with increasing height. Technically it is a rate, with units of centimeter / meter or inches / feet.The aim of the present thesis is the study of the statistical behavior of ninety-three tapers. Tapers are classified into three categories depending on whether they use measured diameters at relative or absolute heights in the tree trunk. In the first category five tapers are examined having the large diameter at 0,3 m and the small diameter at 0.1, 0.3, 0.5, 0.7, and 0.9 of total height of the tree. In the second category, ten tapers are derived from measurements at 0.1, 0.3, 0.5, 0.7, and 0.9 of the total height of the tree. In the third category seventy-eight tapers from 0.3 meters, 1.3 meters 3.3 meters, 5.3 meters, and so on, to the top of the tree are being examined, as well as their combination. In each taper, measures of central tendency, measures of dispersion and measure of skewness were examined. Each taper was examined if it fits normal distribution or not. It emerged that in the first category all tapers approached the normal distribution. In the second category, eight of the ten tapers are satisfactorily reaching the normal distribution, while in the third category thirty-seven out of seventy-eight are satisfactorily reaching the normal distribution. By using regression analysis is examined if the addition of tapers as independent variables improves single or double entry equations of volume tables. The significance of the regression coefficients was checked and the adjusted estimation factor, the standard estimation error of the theoretical values, the mean absolute error were used as criteria. The results show that there is an improvement in the accuracy of volume tables equations by adding specific tapers.Ο κορμός είναι ένα δυναμικό τμήμα του δένδρου που επηρεάζει τη συνολική ανάπτυξη, την οικονομική αξία καθώς και τη θέση του δένδρου ως μέλος μιας δασικής συστάδας. Ένα από τα μέτρα που έχουν προταθεί για τη μελέτη του κορμού είναι ο συντελεστής μείωσης διαμέτρου (ΣΜΔ) που δείχνει τη μείωση της διαμέτρου του κορμού του δένδρου ανά μονάδα μήκους (1 μέτρο). Στην παρούσα έρευνα εξετάζεται η στατιστική συμπεριφορά ενενήντα τριών ΣΜΔ, οι οποίοι ταξινομούνται σε τρεις κατηγορίες ανάλογα αν για τον υπολογισμό τους χρησιμοποιούνται διάμετροι σε σχετικά ή απόλυτα ύψη στον κορμό του δένδρου. Στην πρώτη, εξετάζονται πέντε ΣΜΔ με τη μεγάλη διάμετρο στα 0,3 μέτρα και τη μικρή στα: 0,1, 0,3, 0,5, 0,7 και 0,9 του ολικού ύψους του δένδρου. Στη δεύτερη κατηγορία εξετάζονται δέκα ΣΜΔ που προέρχονται από μετρήσεις στα 0,1, 0,3, 0,5, 0,7, και 0,9 του ολικού ύψους του δένδρου. Στην τρίτη κατηγορία εξετάζονται εβδομήντα οκτώ ΣΜΔ που προέρχονται από μετρήσεις στα 0,3 μέτρα, 1,3 μέτρα 3,3 μέτρα, 5,3 μέτρα κ.ο.κ. μέχρι την κορυφή του δένδρου καθώς και συνδυασμοί τους. Σε κάθε ΣΜΔ εξετάστηκαν τα μέτρα κεντρικής τάσεως, τα μέτρα διασποράς και τα μέτρα μορφής και εάν ακολουθεί την κανονική κατανομή ή όχι. Προέκυψε ότι στην πρώτη κατηγορία όλοι οι ΣΜΔ προσεγγίζουν ικανοποιητικά την κανονική κατανομή. Στη δευτερη κατηγορία οκτώ από τους δέκα ΣΜΔ προσεγγίζουν ικανοποιητικά την κανονική κατανομή, ενώ στην τρίτη κατηγορία τριάντα επτά από τους εβδομήντα οκτώ προσεγγίζουν ικανοποιητικά την κανονική κατανομή.Στη συνέχεια εξετάζεται με τη μέθοδο της ανάλυσης παλινδρόμησης εάν η προσθήκη συναρτήσεων των ΣΜΔ ως ανεξάρτητων μεταβλητών βελτιώνει εξισώσεις μαζοπινάκων απλής ή διπλής εισόδου. Ελέγθηκε η σημαντικότητα των συντελεστών παλινδρόμησης και στη συνέχεια χρησιμοποιήθηκαν ως κριτήρια ο προσαρμοσμένος συντελεστής προσδιορισμού, το τυπικό σφάλμα εκτίμησης των θεωρητικών τιμών, το μέσο απόλυτο σφάλμα, η συνολική και μέση απόκλιση. Στη συνέχεια για την αξιολόγηση της προσαρμογής του μοντέλου έγινε έλεγχος πολυσυγγραμμικότητας των ανεξάρτητων μεταβλητών και εξέταση των υπολοίπων. Τα αποτελέσματα δείχνουν την ύπαρξη βελτίωσης της ακρίβειας των μαζοπινάκων με την προσθήκη συγκεκριμένων ΣΜΔ
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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