scholarly journals Timber Inventory of Large Acreages Using Stratified Two-Stage List Sampling

2005 ◽  
Vol 29 (3) ◽  
pp. 152-157 ◽  
Author(s):  
Bruce E. Borders ◽  
Barry D. Shiver ◽  
Michael L. Clutter
Keyword(s):  
Forest Inventory ◽  
Sampling Method ◽  
Sampling Effort ◽  
Field Sampling ◽  
Two Stage ◽  
Timber Inventory

Abstract We present two-stage list sampling estimators and methodology that are useful in a forest inventory context. The advantages of this sampling method are discussed and illustrated with an inventory of a 3,419-acre timber tract. In this example, two-stage list sampling resulted in strata level and tract level estimates that were very close to estimates from a more intensive cruise that used twice as much field sampling effort. South. J. Appl. For. 29(3):152–157.

A fast edge-based two-stage direct sampling method

2021 ◽  
Vol 150 ◽  
pp. 104742
Author(s):  
Hexiang Bai ◽  
Gregoire Mariethoz
Keyword(s):  
Sampling Method ◽  
Two Stage ◽  
Direct Sampling ◽  
Edge Based

scholarly journals Hot Anchors: A Heuristic Anchors Sampling Method in RCNN-Based Object Detection

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3415 ◽  
Author(s):  
Jinpeng Zhang ◽  
Jinming Zhang ◽  
Shan Yu
Keyword(s):  
Object Detection ◽  
Sampling Method ◽  
Ground Truth ◽  
Detection Accuracy ◽  
Two Stage ◽  
Baseline Model ◽  
Detection Algorithms ◽  
Imbalance Problem ◽  
Image Object Detection ◽  
Image Object

In the image object detection task, a huge number of candidate boxes are generated to match with a relatively very small amount of ground-truth boxes, and through this method the learning samples can be created. But in fact the vast majority of the candidate boxes do not contain valid object instances and should be recognized and rejected during the training and evaluation of the network. This leads to extra high computation burden and a serious imbalance problem between object and none-object samples, thereby impeding the algorithm’s performance. Here we propose a new heuristic sampling method to generate candidate boxes for two-stage detection algorithms. It is generally applicable to the current two-stage detection algorithms to improve their detection performance. Experiments on COCO dataset showed that, relative to the baseline model, this new method could significantly increase the detection accuracy and efficiency.

scholarly journals A study on conceptual associations of colors in preschool children

2019 ◽  
Vol 9 (3) ◽  
pp. 729-764
Author(s):  
Özge Mazlum ◽  
Fehmi Soner Mazlum
Keyword(s):  
Preschool Children ◽  
Working Group ◽  
Sampling Method ◽  
Learning Activities ◽  
Preliminary Review ◽  
Two Stage ◽  
Context Analysis ◽  
Purposive Sampling ◽  
Analysis Technique ◽  
Descriptive Survey

In this study, the conceptual associations of colors in preschool children were examined with an interdisciplinary perspective. Designed as a preliminary review, this study provides insights and suggestions about how conceptual associations of colors can be used for developing products and services for kids and improving the effectiveness of learning activities in education. This study was designed as descriptive survey because it describes an existing situation. This research’s working group was chosen through a purposive sampling method. The study also includes interpreted components. Two-stage interviews were made with 204 children aged between 60 and 72 months in pre-school education in Ankara with active participation of their form teachers, and the data were collected using the context analysis technique. The study found that children show dominant preference for certain colors in connection with certain concepts and they made consistent spectrum preference for certain concepts. These preferences indicate that the children aged between 60 and 72 months are able to make associations between concepts and colors and attribute meanings to colors in the background, with important hints for the use of colors in designing products and planning learning activities for children.

scholarly journals The Determination of Sample Size for Sensitive Issue Successive Survey with the Multiplication RRT Model under Two-Stage and Stratified Two-Stage Random Sampling and Its Application in Medical Survey

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Bo Yu ◽  
Xiaonan Liang ◽  
Ying Wang ◽  
Yun Liu ◽  
Qiao Chang ◽  
...  
Keyword(s):  
Sample Size ◽  
Sampling Method ◽  
Sampling Errors ◽  
Two Stage ◽  
Successive Sampling ◽  
Optimal Sample ◽  
Sensitive Issue ◽  
Survey Accuracy ◽  
The Cost

When designing the sample scheme, it is important to determine the sample size. The survey accuracy and cost of survey and sampling method should be considered comprehensively. In this article, we discuss the method of determining the sample size of complex successive sampling with rotation sample for sensitive issue and deduce the formulas for the optimal sample size under two-stage sampling and stratified two-stage sampling by using Cauchy-Schwartz inequality, respectively, so as to minimize the cost for given sampling errors and to minimize the sampling errors for given cost.

Forest inventory: further results for optimal sampling schemes based on the anticipated variance

2001 ◽  
Vol 31 (10) ◽  
pp. 1845-1853 ◽  
Author(s):  
Daniel Mandallaz ◽  
Adrian Lanz
Keyword(s):  
Forest Inventory ◽  
Optimal Allocation ◽  
Optimality Criterion ◽  
Second Phase ◽  
Optimal Sampling ◽  
Two Stage ◽  
Two Phase ◽  
Sampling Density ◽  
Sampling Schemes ◽  
Inclusion Probabilities

This work presents optimal allocation rules for two-phase, two-stage sampling schemes in which the sampling density and the costs of the second phase can vary over domains. The optimality criterion is based on the anticipated variance. It also gives an improved version of discrete approximation for the resulting inclusion probabilities. An example illustrates the theory.

scholarly journals A two-stage sampling method with stratified secondary units.

2000 ◽  
Vol 35 (2) ◽  
pp. 231-236 ◽  
Author(s):  
Ishizue Adachi ◽  
Kohji Yamamura
Keyword(s):  
Sampling Method ◽  
Two Stage

scholarly journals Keikutsertaan Pria dalam Program Keluarga Berencana di Indonesia

2012 ◽  
Vol 7 (4) ◽  
pp. 158
Author(s):  
Musafaah Musafaah
Keyword(s):  
Family Planning ◽  
Mass Media ◽  
Sampling Method ◽  
Cross Sectional Study ◽  
Two Stage ◽  
Chi Square ◽  
Cross Sectional ◽  
Contact Information ◽  
Married Men ◽  
Mass Media Exposure

Pria telah mengikuti program keluarga berencana (KB) sejak dahulu. Metode pantang berkala dan kondom telah dikenal berabad-abad lalu, tetapi sejak ditemukan kontrasepsi wanita, program KB pada pria seakan diabaikan. Keikutsertaan pria dalam ber-KB masih sangat rendah jika dibandingkan dengan Bangladesh, Pakistan, dan Nepal. Penelitian ini bertujuan untuk menganalisis keikutsertaan pria dalam ber-KB meliputi keterpaparan media massa dan kontak informasi KB melalui media massa. Penelitian ini menggunakan data Survei Demografi dan Kesehatan Indonesia (SDKI) tahun 2007 dengan pendekatan cross sectional terhadap 6.013 pria menikah usia 15 – 54 tahun. Teknik pengambilan sampel yangdigunakan adalah two stage sampling. Analisis data menggunakan chi square dan regresi logistik. Penelitian menunjukkan bahwa pria yang terpapar dengan media massa memiliki kecenderungan 2,12 kali lebih besar untuk ber-KB daripada pria yang kurang terpapar dengan media massa.Selain itu, penelitian juga menunjukkan bahwa pria yang kontak informasi KB melalui media massa memiliki kecenderungan 2,21 kali lebih besar untuk ber-KB daripada pria yang tidak kontak informasi KB melalui media massa. Penelitian ini menunjukkan pria memiliki kecenderungan terbesar untuk ber-KB apabila pria terpapar media massa dan mendapatkan informasi KB melalui media massa dengan OR yang terbesar = 2,77.Kata kunci: keikutsertaan pria, keluarga berencana, media massaAbstractMen already used contraception with withdrawal and condom which had known centuries ago. Since contraception for women was found, men family planning program was likely ignored. The involving of men in family planning in Indonesia is still lower than Bangladesh, Pakistan, and Nepal. The objective of this study is to analyze the credencial factor of men participation in family planning through mass media exposure and contact information. This study used Indonesia Demografic and Health Survey (IDHS) 2007 data used cross-sectional study and 6.013 married men aged 15 – 54 years old as participants. Sampling method used is two stage sampling. Data wasanalyzed by chi square and logistic regression. The research showed that men who were exposed mass media 2,12 times more involved in family planning than men who were not exposed mass media and men who were contact information in family planning through mass media 2,21 times moreparticipating in family planning than men who were not. The result showed that men have the highest possibility to participate in family planning if exposed by mass media and contacted to family planning information through mass media with biggest OR = 2,77.Keywords: The involvement of men, family planning, mass media

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