A Technique for Estimating Tamarack Foliage Production, A Basis for Detailed Population Studies of the Larch Sawfly

1959 ◽  
Vol 91 (8) ◽  
pp. 513-519 ◽  
Author(s):  
W. G. H. Ives
Keyword(s):  
Sample Size ◽  
Sampling Method ◽  
Population Studies ◽  
Sampling Techniques ◽  
Forest Reserve ◽  
Sampling Program ◽  
Larch Sawfly ◽  
Preliminary Study ◽  
Intensive Sampling ◽  
Foliage Weight

This paper is one in a series on sampling techniques used in population studies of the larch sawfly (Ives, 1955; Ives and Prentice, 1958). The technique has been developed to provide bases for comparing the intensity of sawfly infestations in stands of different compositions, and for studying the effect of the insect upon its host. A preliminary study demonstrated the feasibility of developing a sampling method for estimating foliage weight, but also indicated that the foliage weight increased as the season progressed (Ives, 1958). Foliage sampling in stands infested by the larch sawfly must be completed before defoliation becomes prevalent, and the foliage weight may increase considerably after sampling. In 1956 an intensive sampling program was carried out on tamarack in the Whiteshell Forest Reserve, Manitoba, to determine the sample size needed to obtain statistically acceptable estimates of foliage production and to study the nature of changes in foliage weight during the season.

Population and Mortality Assessment During the Egg and Larval Stages of the Larch Sawfly, Pristiphora erichsonii (Htg.)

1962 ◽  
Vol 94 (3) ◽  
pp. 256-268 ◽  
Author(s):  
W. G. H. Ives
Keyword(s):  
Population Studies ◽  
Alternative Methods ◽  
Larval Feeding ◽  
Sampling Techniques ◽  
Larval Stages ◽  
Pristiphora Erichsonii ◽  
Larch Sawfly ◽  
Foliage Weight

This contribution is the eighth in a series of papers on sampling techniques used in population studies of the larch sawfly (Ives, 1955; Ives and Prentice, 1958; Buckner, 1959; Ives, 1959; Ives and Prentice, 1959; Ives and Turnock, 1959; and Turnock, 1960). Although the greatest proportionate mortality usually occurs in the cocoon stage of this insect, the largest amount of mortality in terms of absolute numbers occurs between oviposition and the completion of larval feeding. This paper presents a method for estimating seasonal increments to the egg and larval populations and alternative methods for estimating mortality during these stages. Examples are also provided of the integration of these methods with previously developed techniques for estimating egg populations and foliage weight.

A Sequential Sampling Technique for Surveys of the Larch Sawfly

1958 ◽  
Vol 90 (6) ◽  
pp. 331-338 ◽  
Author(s):  
W. G. H. Ives ◽  
R. M. Prentice
Keyword(s):  
Sampling Methods ◽  
Population Studies ◽  
Sequential Sampling ◽  
Sampling Technique ◽  
Large Sample Size ◽  
Forest Reserve ◽  
Forest Insects ◽  
Pristiphora Erichsonii ◽  
Larch Sawfly

Sequential sampling methods have been developed for population surveys of a number of forest insects (4, 6, 7, 9). These methods permit rapid classification of populations into broad infestation classes with predetermined accuracy and a minimum of sampling, and are useful for mapping and recording widespread infestations.The method of assessing egg populations of the larch sawfly, Pristiphora erichsonii (Htg.), developed by Ives (3) for intensive population studies, was not suitable for surveys because of the large sample size required. A sequential plan for the larch sawfly using hypothetical infestation classes was briefly reviewed by Ives (2). This plan is modified in the present paper in accordance with new data that have accumulated from observations on plots in the Whiteshell Forest Reserve and other stands in Manitoba and Saskatchewan.

scholarly journals Pengaruh E-Word Of Mouth Dan E-Trust Terhadap E-Purchase Decision Mahasiswa Universitas Negeri Padang Pada Marketplace Lazada

Jurnal Ecogen ◽  
2019 ◽  
Vol 2 (4) ◽  
pp. 666
Author(s):  
Azizah Pratika Sari ◽  
Rose Rahmidani
Keyword(s):  
Data Analysis ◽  
Path Analysis ◽  
Sample Size ◽  
Sampling Method ◽  
Word Of Mouth ◽  
Purchase Decision ◽  
Sampling Techniques ◽  
Probability Sampling ◽  
Purposive Sampling ◽  
Analysis Technique

This study aims to know 1) the influence E-Word of Mouth to E-Trust toward E-Purchase Decision Universitas Negeri Padang students on marketplace Lazada, 2) the influence E-Word of Mouth toward E-Purchase Decision Universitas Negeri Padang students on marketplace Lazada, 3) the influence E-Trust toward E-Purchase Decision Universitas Negeri Padang students on marketplace Lazada. The type of study is causal research. The population in this study are Universitas Negeri Padang students who once using marketplace Lazada. The sampling techniques using non probability sampling with purposive sampling method and sample size of 100 respondens by using the formula of Cochran’s. The data analysis technique used is the analysis of the path (path analysis) using SPSS version 21. By using path analysis, the resultsof this study  showed that: (1) E-Word of Mouth have effect on E-Trust toward E-Purchase Decision Universitas Negeri Padang students on marketplace Lazada, (2) E-Word of Mouth affects E-Purchase Decision Universitas Negeri Padang students on marketplace Lazada, (3) E-Trust affects E-Purchase Decision Universitas Negeri Padang students on marketplace LazadaKeyword: E-Word of Mouth, E-Trust, E-Purchase decision

scholarly journals Sampling techniques for isolating trunk disease fungi from a Nelson vineyard

2009 ◽  
Vol 62 ◽  
pp. 406-406
Author(s):  
D.C. Mundy ◽  
S.G. Casonato ◽  
M.A. Manning
Keyword(s):  
Sample Size ◽  
Sampling Method ◽  
Sampling Technique ◽  
Sampling Techniques ◽  
Sample Collection ◽  
Fungal Population ◽  
Heterogeneous Distribution ◽  
The Core ◽  
Core Sampling ◽  
Non Destructive

A trial was conducted of two different sampling techniques (destructive and a non destructive) undertaken at three different times to ascertain the fungal population associated with trunks of grapevines A Nelson vineyard was surveyed in October 2007 using a coring method on 5 vines and 105 vines were subsequently sampled in July and October 2008 using a crosssection sampling method Botryosphaeria Cylindrocarpon Eutypa and Phomopsis were isolated on all occasions regardless of method The detection of other fungi varied with sampling technique and time taken Differences in isolations between methods and timings of sample collection reflect the heterogeneous distribution of the fungi within the trunks of old vines The core sampling technique was sufficient to determine fungi associated with symptomatic and asymptomatic vines The more destructive technique where crosssection samples were taken gave similar results but required more resources If isolations are to be collected from vines then the method timing and sample size need to be considered and standardised

scholarly journals Audit Sampling Methods And Juror Negligence Awards: An Expectation Gap?

2011 ◽  
Vol 19 (1) ◽  
Author(s):  
David L. Gilbertson ◽  
Terri L. Herron
Keyword(s):  
Sample Size ◽  
Sampling Method ◽  
Sampling Methods ◽  
Sampling Techniques ◽  
Statistical Sampling ◽  
Font Size ◽  
Damage Awards ◽  
Expectation Gap ◽  
Audit Sampling ◽  
Sampling Procedures

<p class="MsoNormal" style="text-align: justify; margin: 0in 0.5in 0pt; mso-pagination: none;"><span style="font-family: &quot;Times New Roman&quot;,&quot;serif&quot;; font-size: 10pt;">Generally accepted auditing standards permit auditors to apply both statistical and nonstatistical sampling techniques in obtaining sufficient, competent evidential matter.<span style="mso-spacerun: yes;">&nbsp; </span>However, several recent studies have shown that statistical sampling procedures have nearly disappeared from practice. Despite this trend and the heightened anxiety about professional liability, no studies to date have directly tested the potential implications of sampling method on jurors verdicts, damage awards, or sample size expectations.<span style="mso-spacerun: yes;">&nbsp; </span>In this study we investigate the effect of sampling method on jurors&rsquo; judgments in auditor negligence trials.<span style="mso-spacerun: yes;">&nbsp; </span>Overall, in a case where auditors were alleged to have used an insufficient sample size, the sampling method did not affect the likelihood of a &ldquo;guilty of negligence&rdquo; verdict.<span style="mso-spacerun: yes;">&nbsp; </span>However, as predicted, damage awards were significantly higher when nonstatistical sampling was used compared with statistical sampling.<span style="mso-spacerun: yes;">&nbsp; </span>Exploratory analysis revealed that subjects voting &ldquo;guilty of negligence&rdquo; would require the auditors to examine over 17% of the population (compared with the 1% examined) in order to change their verdict to &ldquo;not guilty of negligence.&rdquo;<span style="mso-spacerun: yes;">&nbsp; </span>These findings have troubling implications for auditors employing sampling techniques.</span></p>

Illegal rattan extraction trends in the Ankasa Conservation Area in Ghana

2018 ◽  
Vol 2 (3) ◽  
pp. 84-92
Author(s):  
R. Obour, D. Amankwaa, A. Asare
Keyword(s):  
Protected Areas ◽  
Biological Diversity ◽  
Forest Products ◽  
Simple Random Sampling ◽  
Sampling Techniques ◽  
Snowball Sampling ◽  
Conservation Area ◽  
Forest Reserve ◽  
The North ◽  
Non Timber Forest Products

Protected Areas (PAs) are created for the protection and maintenance of biological diversity, but many of Ghana’s PAs are subjectto severe pressures and threats, the main pressures being the illegal extraction of natural resources. Rattans are indisputablyone of the most important Non-Timber Forest Products (NTFPs) in Ghana’s Protected Areas that is without doubt one of thereasons for which it has drawn the attention of researchers. In this study the illegal rattan extraction patterns in the AnkasaConservation Area (ACA) in Ghana was inspected. Simple random sampling and Snowball sampling techniques were used. Datacollection employed the use of semi-structured questionnaires, interviews and field enumeration of rattans as well as an analysisof Effective Patrol Man-days (EPMDS) from 2004 to 2012. The results showed a significant positive correlation (r = 0.75, p<0.05, r2 = 0.557) between patrol effort and rattan extraction encounters. In addition, there was a general reduction in illegalrattan extraction encounters from 2004 to 2012 at a rate of 4.3 per year. The highest illegal rattan extraction incidences wererecorded in 2006 (76 encounters), 2005 (35 encounters), 2008 (22 encounters), 2004 (18 encounters) and the least incidencewere recorded in both 2010 (3 encounters) and 2011 (3 encounters).The research also revealed that Eremospatha macrocarpawas the most extracted rattan species followed by Laccosperma secundiflorum. The major rattan extraction and trade routesoriginate in the northern parts and in the area east of the reserve and also south of Draw River Forest Reserve. Generally, rattanpoaching in Ankasa Conservation Area has declined, but there are still human incursions in the northern part of the reserve. Thestudy recommended an intensification of patrols in the north of the reserve. Also, enrichment planting and Agroforestry practicesof inter-cropping rattans with seasonal crops should be pursued vigorously for the local communities.

PENGARUH FAKTOR INTERNAL TERHADAP MINAT BERWIRAUSAHA MAHASISWA FAKULTAS EKONOMI DAN BISNIS UNIVERSITAS JAMBI

2019 ◽  
Vol 8 (1) ◽  
pp. 1-12
Author(s):  
Winda Syafitri ◽  
Dahmiri Dahmiri
Keyword(s):  
Regression Analysis ◽  
Multiple Regression Analysis ◽  
Sampling Method ◽  
Descriptive Analysis ◽  
Research Use ◽  
Sampling Techniques ◽  
Student Interest ◽  
Business Faculty ◽  
Internal Factors ◽  
Convenience Sampling

ABSTRAK The purpose of this research is to explain the effect of Internal Factors toward student interest in entrepreneurship on Economics and Business Faculty of Jambi University. Sampling techniques used on is Non-Probability Sampling with Convenience Sampling Method. The number of respondents is 100 consumers. Technique analysis for this research use descriptive analysis to describe the research variables and multiple regression analysis to find the effect between research variables using SPSS 20.0. This research revealed the significant effect of Internal Factors on Student Interest in entrepreneurship on Economics and business Faculty of Jambi University.   Keywords: Internal Factors, Interest in Entrepreneurship

Analysis and Evaluation of a Framework for Sampling Database in Recommenders

2018 ◽  
Vol 26 (1) ◽  
pp. 41-57 ◽  
Author(s):  
Hodjat Hamidi ◽  
Reza Mousavi
Keyword(s):  
Association Rules ◽  
Relational Database ◽  
Input Data ◽  
Sampling Method ◽  
Data Integrity ◽  
Sampling Techniques ◽  
System Efficiency ◽  
Production Environment ◽  
Analysis And Evaluation

In this paper the authors proposed a database sampling framework that aims to minimize the time necessary to produce a sample database. They argue that the performance of current relational database sampling techniques that maintain the data integrity of the sample database is low and a faster strategy needs to be devised. The sampling method targets the production environment of a system under development that generally consists of large amounts of data computationally costly to analyze. The results have been improved due to the fact that the authors have selected the users that they had more information about them and they have made the data table denser. Therefore, by increasing the data and making the rating more comprehensive for all the users they can help to produce the more and better association rules. The obtained results were not that much suitable for Jester dataset but with their proposed methods the authors have tried to improve the quantity and quality of the rules. These results indicate that the effectiveness of the system greatly depends on the input data and the applied dataset. In addition, if the user rates more number of the items the system efficiency will be more increased.

scholarly journals Demografik Faktörlerin Balık Eti Tüketimindeki Etkisi: Ankara İli Örneği

2016 ◽  
Vol 4 (5) ◽  
pp. 356 ◽  
Author(s):  
Osman Orkan Özer ◽  
Gonca Gül Yavuz ◽  
Umut Gül
Keyword(s):  
Decision Tree ◽  
Sample Size ◽  
Sampling Method ◽  
Central Anatolia ◽  
Seafood Consumption ◽  
Consumption Behavior ◽  
Face To Face ◽  
Chaid Analysis ◽  
Dependent Variables ◽  
And Behavior

This study was carried out in order to analyze seafood consumption level of consumers in Central Anatolia Region (Province Ankara) and their consumption behavior. Proportional sampling method was used in determining sample size and sample size was determined as 167. Data were collected from randomly chosen individuals with face-to-face interviews. As a result of study, in order to determine possible effects of socio-economic properties of consumers on seafood consumption, CHAID analysis which is one of the decision tree analyses was used. According to the results of analysis; it can be said that dependent variables of income, education and age have effect on attitude and behavior of consumers while gender have no effect on consumption behaviors.

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