A simple linear model for the optimal exploitation of renewable resources

1979 ◽  
Vol 5 (1) ◽  
pp. 181-196 ◽  
Author(s):  
Colin W. Clark ◽  
John D. De Pree
1980 ◽  
Vol 94 (2) ◽  
pp. 407-410 ◽  
Author(s):  
G. F. Collier ◽  
D. C. E. Wurr ◽  
Valerie C. Huntington

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.


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

1990 ◽  
Vol 19 (2) ◽  
pp. 155-199 ◽  
Author(s):  
Janet Holmes

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)


2021 ◽  
pp. 139-160
Author(s):  
Andy Hector

This chapter moves on from simple ‘one-way’ designs to more complex factorial designs. It extends the simple linear model to include interactions as well as average main effects. Interactions are assessed relative to a null additive expectation where the treatments have no effect on each other. Interactions can be positive, when effects are more than additive, or negative, when they are less than expected. The chapter considers in detail the analysis of an example data set concerning the mechanisms of loss of plant diversity following fertilizer treatment.


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