Role of Response Surfaces in Soil Test Calibration

2015 ◽  
pp. 31-40 ◽  
Author(s):  
Larry A. Nelson
Keyword(s):  
Response Surfaces ◽  
Soil Test

The role of prediction in evaluating econometric models

1986 ◽  
Vol 407 (1832) ◽  
pp. 25-34 ◽  
Keyword(s):  
Predictive Testing ◽  
Response Surfaces ◽  
Confidence Bands ◽  
Step Test ◽  
Finite Samples ◽  
Data Process ◽  
Distributed Array ◽  
One Step ◽  
Encompassing Test

Many statistical and economic criteria must influence the overall evalua­tion of econometric systems, but success when ‘predictive testing’ seems to establish most credibility, perhaps because the data were unavailable to the modellers. Yet the ability of prediction tests to detect even gross mis-specifications depends both on the properties of the data process and on the structure of the selected tests. To study the issues involved, a mixed analytical-Monte Carlo approach was adopted, based on asymp­totically valid approximations to forecast confidence intervals. Tests were calibrated for finite samples by simulation experiments on a Distributed Array Processor to yield numerical power function response surfaces. The main results of analysing prediction tests are that H successive one-step ahead tests are equivalent to one H -step test; that conditional multi-step forecast confidence bands are not necessarily monotonically increasing in H , so that ‘intercept corrections’ potentially have an objective justification; that tests based on averages (e. g. within-years) may be more useful than either one-step or H -step tests for detecting predictive failure; that the need to pool forecasts indicates non-encompassing models; and that a forecast-encompassing test should have some diagnostic power when applied to macroeconometric systems. Forecasting of the level of uncertainty is briefly considered.

RESPONSE SURFACE METHODOLOGY: A TOOL FOR ASSESSING THE ROLE OF COMPOUNDING INGREDIENTS IN PEROXIDE VULCANIZATION OF NATURAL RUBBER

2016 ◽  
Vol 89 (2) ◽  
pp. 211-226 ◽  
Author(s):  
Rejitha Rajan ◽  
Siby Varghese ◽  
Meera Balachandran ◽  
K. E. George
Keyword(s):  
Zinc Oxide ◽  
Response Surface Methodology ◽  
Natural Rubber ◽  
Response Surface ◽  
Response Surfaces ◽  
Regression Equations ◽  
Face Centered ◽  
The Relationship ◽  
Density Regression

ABSTRACT Response surface methodology was used for assessing the role of various compounding ingredients, including zinc oxide, antioxidant, coagent, oil, and filler, in peroxide vulcanization of natural rubber. A face-centered central composite design with four factors at three different levels was used to obtain the relationship between vulcanizate properties and the level of ingredients. The four factors selected were filler and oil ratio and the contents of zinc oxide, antioxidant, and coagent. The filler and oil ratio was kept constant throughout the experiment. The vulcanizates were evaluated for their mechanical properties: tensile strength, elongation, modulus (M100), tear strength, hardness, compression set (70 and 100 °C), and crosslink density. Regression equations were generated to model the properties of interest, and response surfaces and contour diagrams were plotted.

scholarly journals Broadening the Objectives of Future Potassium Recommendations

2020 ◽  
pp. 385-415
Author(s):  
Jeffrey J. Volenec ◽  
Sylvie M. Brouder ◽  
T. Scott Murrell
Keyword(s):  
Abiotic Stress Tolerance ◽  
Yield Response ◽  
Soil Test ◽  
K Uptake ◽  
K Fertilizer ◽  
The Usa ◽  
Use Efficiency ◽  
Fungal Associations ◽  
K Fertilization

AbstractPotassium (K) fertilizer recommendations for annual crops in the USA are generally founded in soil test results. The goal of this chapter is to highlight additional plant-related traits that may impact crop responses to K fertilization. This includes the role of tissue testing, the influence of luxury consumption, genetic improvement of K use efficiency, genotype × environment × management interactions on K uptake and yield, response to foliar K fertilization, intraplant K cycling, fungal associations and K uptake, the influence of K on crop quality, and the role of K in abiotic stress tolerance. Recognizing the potential role of these plant factors may help reconcile response inconsistencies based solely on soil test information, and improve future K recommendations. Finally, we hope to highlight knowledge gaps and opportunities for additional integrated soil–plant K research.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management

The power of norms to sway fused group members

2018 ◽  
Vol 41 ◽  
Author(s):  
Winnifred R. Louis ◽  
Craig McGarty ◽  
Emma F. Thomas ◽  
Catherine E. Amiot ◽  
Fathali M. Moghaddam
Keyword(s):  
Evolutionary Anthropology ◽  
Normative Systems ◽  
Violent Extremism ◽  
Identity Fusion ◽  
Group Members

AbstractWhitehouse adapts insights from evolutionary anthropology to interpret extreme self-sacrifice through the concept of identity fusion. The model neglects the role of normative systems in shaping behaviors, especially in relation to violent extremism. In peaceful groups, increasing fusion will actually decrease extremism. Groups collectively appraise threats and opportunities, actively debate action options, and rarely choose violence toward self or others.

Elaborating the role of reflection and individual differences in the study of folk-economic beliefs

2018 ◽  
Vol 41 ◽  
Author(s):  
Kevin Arceneaux
Keyword(s):  
Decision Making ◽  
Individual Differences ◽  
Cognitive Processes ◽  
Evolutionary History ◽  
Behavioral Responses ◽  
History Of ◽  
Economic Beliefs

AbstractIntuitions guide decision-making, and looking to the evolutionary history of humans illuminates why some behavioral responses are more intuitive than others. Yet a place remains for cognitive processes to second-guess intuitive responses – that is, to be reflective – and individual differences abound in automatic, intuitive processing as well.

The role of affect in feelings of obligation

2020 ◽  
Vol 43 ◽  
Author(s):  
Stefen Beeler-Duden ◽  
Meltem Yucel ◽  
Amrisha Vaish
Keyword(s):  
Positive Emotions ◽  
The Creation ◽  
Sense Of Obligation

Abstract Tomasello offers a compelling account of the emergence of humans’ sense of obligation. We suggest that more needs to be said about the role of affect in the creation of obligations. We also argue that positive emotions such as gratitude evolved to encourage individuals to fulfill cooperative obligations without the negative quality that Tomasello proposes is inherent in obligations.

Refining our understanding of the “elephant in the room”

2020 ◽  
Vol 43 ◽  
Author(s):  
Andrew Whiten
Keyword(s):  
Social Cognition ◽  
Cultural Evolution ◽  
Cognitive Abilities ◽  
Critical Factors ◽  
Technological Culture

Abstract The authors do the field of cultural evolution a service by exploring the role of non-social cognition in human cumulative technological culture, truly neglected in comparison with socio-cognitive abilities frequently assumed to be the primary drivers. Some specifics of their delineation of the critical factors are problematic, however. I highlight recent chimpanzee–human comparative findings that should help refine such analyses.

Choosing a Markov blanket

2020 ◽  
Vol 43 ◽  
Author(s):  
Thomas Parr
Keyword(s):  
Markov Blanket ◽  
Target Article ◽  
The Relationship

Abstract This commentary focuses upon the relationship between two themes in the target article: the ways in which a Markov blanket may be defined and the role of precision and salience in mediating the interactions between what is internal and external to a system. These each rest upon the different perspectives we might take while “choosing” a Markov blanket.

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