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comparing methods for mapping canopy chlorophyll content in a mixed mountain forest using Sentinel-2 data

INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION 2020年第0期87卷 102037-000页

作者： Ali, Abebe Mohammed Darvishzadeh, Roshanak Skidmore, Andrew Gara, Tawanda W. O'Connor, Brian Roeoesli, Claudia Heurich, Marco Paganini, Marc Univ Twente Fac Geoinformat Sci & Earth Observat ITC POB 217 NL-7500 AE Enschede Netherlands Wollo Univ Dept Geog & Environm Studies POB 1145 Dessie Ethiopia Macquarie Univ Dept Environm Sci Sydney NSW 2106 Australia Univ Zimbabwe Dept Geog & Environm Sci POB MP167 Harare Zimbabwe UN Environm Programme World Conservat Monitorin 219 Huntingdon Rd Cambridge CB3 0DL England Univ Zurich UZH Dept Geog Remote Sensing Labs Winterthurerstr 190 CH-8057 Zurich Switzerland Bavarian Forest Natl Pk Dept Visitor Management & Natl Pk Monitoring D-94481 Grafenau Germany Univ Freiburg Chair Wildlife Ecol & Wildlife Management Tennenbacher Str 4 Freiburg Germany European Space Agcy ESRIN Via Galileo GalileiCasella Postale 64 I-00044 Frascati RM Italy

The Sentinel-2 Multi-Spectral Imager (MSI) has three spectral bands centered at 705, 740, and 783 nm wavelengths that exploit the red-edge information useful for quantifying plant biochemical traits. This sensor configuration is expected to improve the prediction accuracy of vegetation chlorophyll content. In this work, we assessed the performance of several statistical and physical-based methods in retrieving canopy chlorophyll content (CCC) from Sentinel-2 in a heterogeneous mixed mountain forest. Amongst the algorithms presented in the literature, 13 different vegetation indices (VIs), a non-parametric statistical approach, and two radiative transfer models (RTM) were used to assess the CCC prediction accuracy. A field campaign was conducted in July 2017 to collect in situ measurements of CCC in Bavarian forest national park, and the cloud-free Sentinel-2 image was acquired on 13 July 2017. The leave-one-out cross-validation technique was used to compare the VIs and the non-parametric approach. Whereas physical-based methods were calibrated using simulated data and validated using the in situ reference dataset. The statistical-based approaches, such as the modified simple ratio (mSR) vegetation index and the partial least square regression (PLSR) outperformed all other techniques. As such the modified simple ratio (mSR3) (665, 865) gave the lowest cross-validated RMSE of 0.21 g/m(2) (R-2 = 0.75). The PISR resulted in the highest R-2 of 0.78, and slightly higher RMSE = 0.22 g/m(2) than mSR3. The physical-based approach-INFORM inversion using look-up table resulted in an RMSE = 0.31 g/m(2), and R-2 = 0.67. Although mapping CCC using these methods revealed similar spatial distribution patterns, over and underestimation of low and high CCC values were observed mainly in the statistical approaches. Further validation using in situ data from different terrestrial ecosystems is imperative for both the statistical and physical-based approaches' effectiveness to quantify

关键词： Canopy chlorophyll content (CCC) comparing methods Statistical methods Radiative transfer model inversion SNAP toolbox Sentinel-2

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Battles and crossings of methods: Sequence analysis and geometric data analysis for the study of professional careers

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BMS-BULLETIN OF SOCIOLOGICAL METHODOLOGY-BULLETIN DE METHODOLOGIE SOCIOLOGIQUE 2024年第1期163卷 135-185页

作者： Michon, Sebastien Univ Strasbourg SAGE CNRS Strasbourg France

This article proposes to discuss the exploratory use of two quantitative methods: on the one hand sequence analysis combined with optimal matching methods, and on the other hand geometric data analysis, more specifically multiple correspondence analysis and principal component analysis, combined with hierarchical ascending classifications. The aim is not to determine whether one method is more effective than another, nor to pit them against each other. The aim is to identify similarities and differences, and, more generally, to reflect on the cross-use of quantitative methods. The approach is decidedly practical and reflective. It consists of opening up the kitchen of implementation through a case study: build a typology of the professional futures of the accredited parliamentary assistants at the European Parliament. The paper defends the idea that typologies are tools and stages in analysis. Putting these methods to the test in this way aims to highlight several issues, suggest avenues of analysis, and highlight the need to explore the data using a variety of tools. This text is an invitation to compare and combine methods, and to use them in a considered and non-mechanical way, taking into account their strengths but also their weaknesses, which are also instructive. Matche(r) de(s) m & eacute;thodes pour d & eacute;crire des carri & egrave;res professionnelles : Analyse de s & eacute;quence et Analyse g & eacute;om & eacute;trique de donn & eacute;es. Cet article discute l'utilisation exploratoire de deux m & eacute;thodes quantitatives : d'une part l'analyse de s & eacute;quences combin & eacute;e & agrave;des m & eacute;thodes d'appariement optimal;d'autre part l'analyse g & eacute;om & eacute;trique des donn & eacute;es, plus pr & eacute;cis & eacute;ment l'analyse des correspondances multiples et l'analyse en composantes principales, combin & eacute;e & agrave;des classifications ascendantes hi & eacute;rarchiques. L'objectif n'est pas de d & eacute;terminer

关键词： analyse des correspondances multiples analyse en composantes principales analyse g & eacute om & eacute trique des donn & eacute es analyse de sequences optimal matching carri & egrave res dans les m & eacute tiers de l'Europe carri & egrave res professionnelles classification ascendante hi & eacute rarchique comparaison de m & eacute thodes typologie clustering comparing methods EU careers geometric data analysis hierarchical ascendant classification multiple correspondence analysis principal component analysis professional paths sequence analysis

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An advanced aqueous method of recovering pumpkin seed kernel oils and de-oiled meal: Optimization and comparison with other methods

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GRASAS Y ACEITES 2022年第2期73卷 1-13页

作者： Fu, J. Wu, W. Southwest Univ Coll Food Sci 2 Tian Shengqiao Chongqing Peoples R China

The optimal process conditions of the advanced aqueous method for recovering oil and de-oiled meal from pumpkin seed kernels were: baking the kernels at 110 degrees C for 1 min, grinding them to pass through a sieve of 150 um pore size, adding 1.60 ml brine to 10.00 g ground kernels, stirring for 30 min at 30 degrees C, centrifuging at 4000 r/min for 30 min and cold-pressing the residue from centrifugation. This method recovered > 94% oil. Its oil recovery rate was comparable to that of solvent extraction and higher than that of enzyme-assisted aqueous method or hot-pressing. It recovered edible oil with higher quality and level of coenzyme Q10, tocopherols, carotenoids, total phytosterols and squalene as compared to solvent extraction or hot-pressing and requirements of China's national standard. It is superior to enzyme-assisted aqueous method or hot-pressing for recovering de-oiled meal which is suitable for making texturized protein.

关键词： Optimizing parameters comparing methods Water Bioactive compounds Green technology

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Conducting correlation analysis: important limitations and pitfalls

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CLINICAL KIDNEY JOURNAL 2021年第11期14卷 2332-2337页

作者： Janse, Roemer J. Hoekstra, Tiny Jager, Kitty J. Zoccali, Carmine Tripepi, Giovanni Dekker, Friedo W. van Diepen, Merel Leiden Univ Dept Clin Epidemiol Med Ctr Leiden Netherlands Vrije Univ Amsterdam Dept Nephrol Amsterdam UMC Amsterdam Cardiovasc Sci Amsterdam Netherlands Univ Amsterdam Amsterdam Publ Hlth Res Inst Dept Med Informat Amsterdam UMCERA EDTA Registry Amsterdam Netherlands CNR IFC Ctr Clin Physiol Clin Epidemiol Renal Dis & Hyper Reggio Di Calabria Italy

The correlation coefficient is a statistical measure often used in studies to show an association between variables or to look at the agreement between two methods. In this paper, we will discuss not only the basics of the correlation coefficient, such as its assumptions and how it is interpreted, but also important limitations when using the correlation coefficient, such as its assumption of a linear association and its sensitivity to the range of observations. We will also discuss why the coefficient is invalid when used to assess agreement of two methods aiming to measure a certain value, and discuss better alternatives, such as the intraclass coefficient and Bland-Altman's limits of agreement. The concepts discussed in this paper are supported with examples from literature in the field of nephrology.

关键词： Bland-Altman comparing methods correlation analysis limits of agreement Pearson correlation coefficient

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Comparison of simultaneous measurement of mouse locomotor activity by radiotelemetry and photobeam methods

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JOURNAL OF PHARMACOLOGICAL AND TOXICOLOGICAL methods 2015年 71卷 90-94页

作者： Streng, Tomi Klemola, Tero Bastman, Sanna Nevalainen, Jaakko Scheinin, Mika Univ Turku Dept Biol Div Genet & Physiol FI-20014 Turku Finland Univ Turku Turku Ctr Dis Modeling FI-20014 Turku Finland Univ Turku Dept Pharmacol Drug Dev & Therapeut FI-20014 Turku Finland Turku Univ Hosp Clin Pharmacol Unit FI-20014 Turku Finland Univ Turku Dept Biol Sect Ecol FI-20014 Turku Finland Univ Turku Dept Math & Stat Ctr Stat FI-20014 Turku Finland

Introduction: Locomotor activity recordings are widely used in different physiological and pharmacological studies. There are two mainly used methods -radiotelemetry and photobeam recording systems. To our knowledge, these methods have not previously been directly and simultaneously compared. methods: The current study consisted of a comparison of locomotor activity data gained simultaneously from radiotelemetry and photobeam recordings, firstly from a robotic device and secondly from an animal experiment performed with mice. Results: Data gained from the animal study showed relatively high variation, but overall agreement between the methods was good. Discussion: The two methods were cross-validated in the current study. The data gained from both methods were in good general agreement. However, in an animal experiment, e.g. when sedative drugs or other behavior-modifying interventions are used, one should interpret the results with caution as alterations in animal behavior (e.g. in grooming) may possibly not be picked up similarly by the two methods. (C) 2014 Elsevier Inc. All rights reserved.

关键词： comparing methods Locomotor activity Mouse Movement

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Effectiveness of Selected Teaching Strategies in the Remediation of Process Errors Committed by Senior Secondary School Students in Mathematics

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Journal of Social Sciences 2010年第2期22卷 139-144页

The purpose of the study was to determine the effectiveness of selected teaching strategies in theremediation of process errors committed by students in mathematics in senior secondary schools. Four hypotheseswere formulated to guide the study. The study employed the quasi–experimental design. Sample for the study consistedof two hundred and seven (207) students drawn from six senior secondary schools randomly selected from the threehundred and sixty senior secondary schools in Edo State. The Diagnostic Test on Mathematics (DIATOM) was usedto collect data for the study. Data collected were analysed using analysis of covariance (ANCOVA) and z-test for twopopulation proportions. Results of data analysis revealed that the direct instruction was a more effective strategy forthe remediation of process errors committed by students in mathematics. Sex and school location were shown not tohave had any significant influence on the effectiveness of either strategy. The study recommended that enoughpractice activities should be given to students during class sessions to assist them develop mastery of content taught.

关键词： Teaching methods Correcting Errors Improvement comparing methods

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Assessment of a Framework for comparing Software Architecture Analysis methods 11

Assessment of a Framework for Comparing Software Architectur...

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11th International Conference on Evaluation and Assessment in Software Engineering, EASE 2007

作者： Ali Babar, Muhammad Kitchenham, Barbara Lero University of Limerick Ireland National ICT Australia

We have developed a framework, FOCSAAM, for comparing software architecture analysis methods. FOCSAAM can help architects and managers to choose a specific method to support architecture analysis process. We have been assessing the suitability of the framework’s elements in different ways. During the development of FOCSAAM, a theoretical assessment was performed by relating each of its elements to the published literature on quality assurance, process improvement, and software development approaches. Moreover, we have also found that most of the elements of FOCSAAM can also be mapped onto the elements of a well-known framework for comparing information systems development methods, NIMSAD framework. Our goal of this study was to further assess the suitability of different elements of FOCSAAM by using the expert opinion approach. We asked 17 practicing architects with extensive experience to assess the suitability of the elements of FOCSAAM for selecting a particular method to support the software architecture analysis process. The findings of this study provide support for each element of FOCSAAM to be included in forming criteria for comparing software architecture analysis methods. © 2007 11th International Conference on Evaluation and Assessment in Software Engineering, EASE 2007. All Rights Reserved.

关键词： comparing methods empirical studies expert opinion model assessment Software architecture analysis

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Assessing suicide ideation: comparing self-report versus clinician report

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Journal of the American Psychiatric Nurses Association 2004年第1期10卷 9-15页

作者： Yigletu, Hirut Tucker, Sharon Harris, Marcelline Hatlevig, Jacqueline College of Nursing/Health Sciences Winona State University Winona MN United States Department of Nursing Mayo Clinic Rochester MN United States

Background: The accurate identification of suicidal individuals is an important but complex process. Common approaches to suicide assessment include self-report tools and clinician interview. Purpose: The purpose of this study was to examine and compare two assessment methods for determining suicidal ideation of patients admitted for treatment of a mood or anxiety disorder. Design: A secondary analysis of an existing dataset was conducted. Sixty-eight inpatients treated for mood or anxiety disorders completed the Beck Depression Inventory (BDI) and were assessed by a clinician using an investigator-developed interview schedule. One item from BDI and one question from the interview schedule were used to compare two methods for assessing suicidal ideation. Results: In 80% of cases, responses were in agreement between the two assessment methods. However, disagreement between assessment methods was found for 13 (19.4%) cases. The rate of disagreement was beyond chance (p=.00). Conclusion: The findings support inclusion of both a self-report method and a face-to-face interview to assess suicide ideations. Further research is warranted to examine if both methods for assessing suicide ideations are indicated during the first 24 hours after admission to an inpatient unit. Copyright © 2004 American Psychiatric Nurses Association.

关键词： comparing methods Depression Psychiatric hospitalization Suicide assessment

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