scholarly journals Local variation in hedonic house pricing in Hanoi, Vietnam: a spatial analysis of status quality trade-off (SQTO) theory

2016 ◽  
Vol 1 ◽  
Author(s):  
Alexis Comber ◽  
Paul Harris ◽  
Quan Nguyen ◽  
Khanh Chi ◽  
Hung Tran ◽  
...  
Keyword(s):  
Spatial Analysis ◽  
Local Variation ◽  
Trade Off

scholarly journals The response to selection of different procedures for the analysis of early generation variety trials

1992 ◽  
Vol 118 (2) ◽  
pp. 141-148 ◽  
Author(s):  
B. R. Cullis ◽  
A. C. Gleeson ◽  
F. M. Thomson
Keyword(s):  
Spatial Analysis ◽  
Field Experiments ◽  
Test Line ◽  
Local Variation ◽  
Response To Selection ◽  
Early Generation ◽  
One Dimensional ◽  
Relative Response ◽  
Genotypic Effects ◽  
Selection Of

SUMMARYA simulation study was conducted to determine the relative response to selection of a one-dimensional spatial analysis of field experiments (SAFE) specifically adapted for early generation trials. The primary purpose of the analysis in these trials is to obtain accurate estimates of genotypic effects of the unreplicated test lines by adjusting for local variation, using either the yields of all neighbouring plots or the yields of neighbouring plots of (replicated) check varieties. The response to selection of the SAFE analysis, relative to the use of unadjusted yields of test line plots, was consistently greater than the relative response to selection of check-plot-only analyses. The relative response to selection of SAFE increased as the percentage of trend variance increased.

scholarly journals Spatial statistical analysis and selection of genotypes in plant breeding

2005 ◽  
Vol 40 (2) ◽  
pp. 107-114 ◽  
Author(s):  
João Batista Duarte ◽  
Roland Vencovsky
Keyword(s):  
Statistical Analysis ◽  
Spatial Analysis ◽  
Plant Breeding ◽  
Statistical Tests ◽  
Block Design ◽  
Local Variation ◽  
Basic Material ◽  
Spatial Statistical Analysis ◽  
Plant Breeding Program ◽  
Selection Of

The objective of this study was to evaluate the efficiency of spatial statistical analysis in the selection of genotypes in a plant breeding program and, particularly, to demonstrate the benefits of the approach when experimental observations are not spatially independent. The basic material of this study was a yield trial of soybean lines, with five check varieties (of fixed effect) and 110 test lines (of random effects), in an augmented block design. The spatial analysis used a random field linear model (RFML), with a covariance function estimated from the residuals of the analysis considering independent errors. Results showed a residual autocorrelation of significant magnitude and extension (range), which allowed a better discrimination among genotypes (increase of the power of statistical tests, reduction in the standard errors of estimates and predictors, and a greater amplitude of predictor values) when the spatial analysis was applied. Furthermore, the spatial analysis led to a different ranking of the genetic materials, in comparison with the non-spatial analysis, and a selection less influenced by local variation effects was obtained.

scholarly journals Modelling the first dose of measles vaccination: the role of maternal immunity, demographic factors, and delivery systems

2010 ◽  
Vol 139 (2) ◽  
pp. 265-274 ◽  
Author(s):  
C. J. E. METCALF ◽  
P. KLEPAC ◽  
M. FERRARI ◽  
R. F. GRAIS ◽  
A. DJIBO ◽  
...  
Keyword(s):  
Access To Care ◽  
Vaccination Coverage ◽  
Birth Rate ◽  
Local Variation ◽  
Measles Vaccine ◽  
Trade Off ◽  
Maternal Immunity ◽  
Measles Vaccination ◽  
Low Coverage

SUMMARYMeasles vaccine efficacy is higher at 12 months than 9 months because of maternal immunity, but delaying vaccination exposes the children most vulnerable to measles mortality to infection. We explored how this trade-off changes as a function of regionally varying epidemiological drivers, e.g. demography, transmission seasonality, and vaccination coverage. High birth rates and low coverage both favour early vaccination, and initiating vaccination at 9–11 months, then switching to 12–14 months can reduce case numbers. Overall however, increasing the age-window of vaccination decreases case numbers relative to vaccinating within a narrow age-window (e.g. 9–11 months). The width of the age-window that minimizes mortality varies as a function of birth rate, vaccination coverage and patterns of access to care. Our results suggest that locally age-targeted strategies, at both national and sub-national scales, tuned to local variation in birth rate, seasonality, and access to care may substantially decrease case numbers and fatalities for routine vaccination.

A Flow-Preserving Algorithm for the Time-Cost Trade-Off Problem

1982 ◽  
Vol 14 (2) ◽  
pp. 109-113 ◽  
Author(s):  
Suleyman Tufekci
Keyword(s):  
Time Cost ◽  
Trade Off

Dual Goals for Speed and Accuracy on the Same Performance Task

2012 ◽  
Vol 11 (3) ◽  
pp. 118-126 ◽  
Author(s):  
Olive Emil Wetter ◽  
Jürgen Wegge ◽  
Klaus Jonas ◽  
Klaus-Helmut Schmidt
Keyword(s):  
Memory Scanning ◽  
Performance Task ◽  
Performance Tasks ◽  
Trade Off ◽  
Test Experiment ◽  
Trade Offs ◽  
New Finding ◽  
Sternberg Paradigm ◽  
Speed Accuracy ◽  
Speed And Accuracy

In most work contexts, several performance goals coexist, and conflicts between them and trade-offs can occur. Our paper is the first to contrast a dual goal for speed and accuracy with a single goal for speed on the same task. The Sternberg paradigm (Experiment 1, n = 57) and the d2 test (Experiment 2, n = 19) were used as performance tasks. Speed measures and errors revealed in both experiments that dual as well as single goals increase performance by enhancing memory scanning. However, the single speed goal triggered a speed-accuracy trade-off, favoring speed over accuracy, whereas this was not the case with the dual goal. In difficult trials, dual goals slowed down scanning processes again so that errors could be prevented. This new finding is particularly relevant for security domains, where both aspects have to be managed simultaneously.

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