scholarly journals Time to change from a simple linear model to a complex systems model

2016 ◽  
Vol 31 ◽  
pp. e2016008
Author(s):  
Yun-Chul Hong
Keyword(s):  
Complex Systems ◽  
Linear Model ◽  
Simple Linear Model ◽  
Systems Model

The susceptibility of potato varieties to internal rust spot

1980 ◽  
Vol 94 (2) ◽  
pp. 407-410 ◽  
Author(s):  
G. F. Collier ◽  
D. C. E. Wurr ◽  
Valerie C. Huntington
Keyword(s):  
Linear Model ◽  
Calcium Chloride ◽  
Calcium Concentration ◽  
Potato Varieties ◽  
Simple Linear Model ◽  
Varietal Susceptibility

SummaryIn tubers of ten potato varieties the incidence of internal rust spot lesions increased and the calcium concentration decreased when the concentration of calcium chloride supplied to the plants fell from 9 to 1 mM. A simple linear model relating the probit transformation of internal rust spot incidence to tuber calcium concentration for each variety showed that there were substantial differences in varietal susceptibility to internal rust spot which were not related to tuber calcium concentration.

A simple linear model of demand paging performance

1974 ◽  
Vol 17 (4) ◽  
pp. 181-186 ◽  
Author(s):  
Jerome H. Saltzer
Keyword(s):  
Linear Model ◽  
Simple Linear Model

Apologies in New Zealand English

1990 ◽  
Vol 19 (2) ◽  
pp. 155-199 ◽  
Author(s):  
Janet Holmes
Keyword(s):  
New Zealand ◽  
Linear Model ◽  
Social Relationships ◽  
Affective Meaning ◽  
Simple Linear Model ◽  
Politeness Strategies ◽  
Social Acts ◽  
Single Strategy ◽  
Almost All

ABSTRACTThe function of apologies is discussed within the context of a model of interaction with two intersecting dimensions – affective and referential meaning. Apologies are defined as primarily social acts conveying affective meaning. The syntactic, semantic, and sociolinguistic features of apologies are described, based on a corpus of 183 apologies. While apology exchanges divided equally between those which used a combination of strategies and those where a single strategy sufficed, almost all apology exchanges involved an explicit apology. An account is provided of the kinds of social relationships and the range of offenses which elicited apologies in this New Zealand corpus.Apologies are politeness strategies, and an attempt is made to relate the relative “weightiness” of the offense (assessed using the factors identified as significant in Brown and Levinson's model of politeness) to features of the apology strategies used to remedy it. Though some support is provided for Brown and Levinson's model, it is suggested that Wolf-son's “bulge” theory more adequately accounts for a number of patterns in the data. In particular, the functions of apologies between friends may be more complex than a simple linear model suggests. (Apologies, politeness, speech functions, New Zealand English, sociolinguistics, pragmatics)

scholarly journals Recursive systems model of fetal birth weight and calving difficulty in beef heifers

2002 ◽  
Vol 82 (1) ◽  
pp. 19-27 ◽  
Author(s):  
P. R. Tozer ◽  
D. L. Scollard ◽  
T. L. Marsh ◽  
T. J. Marsh
Keyword(s):  
Birth Weight ◽  
Linear Model ◽  
Logit Model ◽  
Management Technique ◽  
Ordered Logit ◽  
Ordered Logit Model ◽  
Systems Model ◽  
Cow Calf ◽  
Calving Difficulty ◽  
Recursive Systems

The purpose of this study was to use readily available information, including dam pelvic width (PW) and height (PH) and the fetal coronet band (CB) measurement to predict the calving difficulty (CD) score of first-calf heifers under commercial ranch conditions. Data were collected from a cow-calf ranch over a 3-yr period. Using a recursive system of equations, two models were estimated. First, a linear model was used to predict birth weight (BTW) based on the fetal CB measurement. Second, an ordered logit model was used to predict calving difficulty score based on a nonlinear relationship with birth weight, pelvic dimensions of the dam, and interaction terms. The linear model demonstrated that BTW could be predicted using the CB measurement, both the intercept and slope coefficients were significant at P < 0.001. The model R2 was equal to 0.57 and the standard error of the predicted birth weight was 2.77 kg. The ordered logit model correctly predicted 468 of 684 (68.4%) of the CD scores. The results of this research suggest that it is possible to predict dystocia or calving difficulty on a case-by-case basis with information that is available to ranchers or ranch managers early in the parturition process. The management technique presented has been successfully adopted by some large-scale cow-calf operations, thus the results have commercial applications for beef producers. Key words: Dystocia, heifers, beef, recursive systems, ordered logit, coronet band, birth weight

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