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Wyszukujesz frazę "Logistic Regression" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Model klasyfikacyjny prognozowania wystąpienia masowych szkód w uprawach leśnych od pędraków chrabąszczy (Melolontha Fabr.)
Classification model for prediction of mass damage in young forest plantations caused by larvae of cockchafer (Melolontha Fabr.)
Autorzy:
Drozdowski, S.
Jankowski, P.
Byk, A.
Powiązania:
https://bibliotekanauki.pl/articles/993325.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
ochrona lasu
uprawy lesne
szkodniki roslin
chrabaszcz
Melolontha
pedraki
szkody w lesie
prognozowanie
modele klasyfikacyjne
melolontha
logistic regression
root pests
young forest plantations
Opis:
Study presents a classification model for predicting the occurrence of mass damage in young forest plantations caused by insect pests on roots belonging to Melolontha genus. Logistic regression model was built on the basis of 10 taxation features describing 177 young stands. Habitat fertility, occurrence of Scots pine and European beech, and weed infestation of the habitat are the most significant features that influence mass occurrence of cockchafer larvae acting as insect pests on roots in plantations.
Źródło:
Sylwan; 2013, 157, 09; 678-685
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hipotetyczna gotowość finansowania publicznych funkcji lasu i gospodarki leśnej
Hypothetical readiness for financing the most important public functions of forest and forest management
Autorzy:
Gołos, P.
Ukalska, J.
Powiązania:
https://bibliotekanauki.pl/articles/989519.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
lasy
gospodarka lesna
funkcje lasu
funkcje publiczne
funkcje turystyczne
funkcje wypoczynkowe
hipotetyczna gotowosc finansowania
badania ankietowe
contingent valuation
leisure−related functions of forest
logistic regression
Opis:
The purpose of the research was to determine the impact of selected sociological factors related to the readiness for hypothetical financing the most important public functions of forest and forest management (WTP, willingness to pay). In direct surveys carried out in August 2008 by the nationwide research center on representative random sample of 500 residents of Warsaw we used the contingent valuation method (CVM) format of questions with a debit card. The result of determining the values of forest and forest management public benefits with the CVM method (set of values WTP>0 [PLN/year/household]) was analyzed via logistic regression, in which a dependency between the fact of declaring the value WTP>0 (1 – WTP>0 declaration, 0 – WTP=0 declaration) and the selected groups of explanatory variables was assessed. The division of explanatory variables into groups resulted from the survey structure and content of questions, related to different aspects of leisure related forest management. The significance of variables in analyzed regression models was investigated with the maximum likelihood method using Wald's chi−square statistic for the 3rd type analysis. Wald's confidence intervals were designated for regression coefficients in exponential scale, and in order to facilitate the interpretation of results, odds ratios were determined. The logistic regression was performed in SAS 9.3 program with the LOGISTIC procedure. The probability of WTP>0 declaration increased among respondents, who indicated: a) peace and quiet as elements which decide of tourist attractiveness of forests; b) car parks as missing elements; c) that they do not feel well in forests with unsightly tree stand; and d) that they relax better in forests where there are shelters, benches, and roofings.
Źródło:
Sylwan; 2016, 160, 07; 597-608
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model klasyfikacyjny prognozowania wystąpienia mikoryzy u jednorocznych siewek sosny zwyczajnej (Pinus sylvestris L.) na zrębie zupełnym
Classification model for the prediction of mycorrhiza development of one-year-old Scots pine (Pinus sylvestris L.) seedlings on clear-cut
Autorzy:
Aleksandrowicz-Trzcińska, M.
Drozdowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/994751.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
zrab zupelny
odnowienia lasu
odnowienia naturalne
sosna zwyczajna
Pinus sylvestris
mikrosiedliska
siewki jednoroczne
cechy biometryczne
mikoryza
wystepowanie
modele predykcyjne
analiza logistyczna
logistic regression
natural regeneration
microhabitat
ectomycorrhiza
biometric parameters
Opis:
The aim of this study was to build the models describing the relationships between mycorrhiza development in one−year−old Scots pine seedlings and site preparation method, place of growth of seedlings on the clear−cut area and their biometric parameters. A logistic regression was used to study.
Źródło:
Sylwan; 2012, 156, 12; 883-894
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ryzyko masowego występowania pędraków chrabąszczy (Melolontha spp.) w strefie ekotonowej drzewostanów dojrzałych na terenie Nadleśnictwa Lubaczów
Risk of the mass occurrence of cockchafer (Melolontha spp.) grubs in the ecotone of mature stands in Lubaczow Forest District
Autorzy:
Niemczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/989889.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
drzewostany dojrzale
ekotony
ekoton las-laka
szkodniki roslin
chrabaszcz majowy
Melolontha melolontha
chrabaszcz kasztanowiec
Melolontha hippocastani
pedraki
wystepowanie masowe
ryzyko wystapienia
regresja logistyczna
Nadlesnictwo Lubaczow
melolontha spp.
forest−meadow ecotone
mature stand
logistic regression
Opis:
This study evaluated the environmental risk drivers affecting the occurrence of cockchafer grubs in mature stands bordering with open spaces. The following factors were taken into the consideration: the distance from the edge towards the forest interior, the forest site type, species composition, canopy openness and the cover of forest floor with vegetation as well as cutting treatment in some of the investigated stands. In one of the biggest cockchafer outbreak centers in Poland (Lubaczów Forest District; SE Poland) 6 mature stands were chosen and estalished 5 transects in each of them. Each transect was 250 m long and consisted of 6 pits (1×0.5×0.5 m) in a regular distance of 50 m with the first pit on an open space bordering with forest. Pits were used to determine the grub infestation of the soil. In the area of 100 m² around the pit, the general vegetation cover and tree species composition of a stand were characterized. The forest light environment was defined by hemispherical photography. The distance in transect and the fact that stand was harvested were also taken into consideration. The applied logistic regression model demonstrated that the site fertility is the most important factor that significantly increases the risk of cockchafer grubs occurrence. The other characteristics that also cause that stand is more attractive for the cockchafer grubs are: participation of the broadleaved species in stand composition and the dense vegetation cover. Furthermore, the cockchafer grubs occurrence was more frequent in the forest interior than in an open space or at the forest−meadow ecotone.
Źródło:
Sylwan; 2015, 159, 04; 326-335
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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