Search Results

You are looking at 11 - 20 of 2,632 items for :

  • "regression" x
  • Refine by Access: All Content x
Clear All
Community Ecology
Authors:
L.T. Waser
,
S. Stofer
,
M. Schwartz
,
M. Küchler
,
E. Ivits
, and
C. Scheidegger

Lehmann, A., J. M. Overton and M. P. Austin. 2002. Regression models for spatial prediction: their role for biodiversity and conservation. Biodiversity and Conservation 11: 2085-2092. Regression models for spatial prediction

Restricted access

. Ruban , D.A. in press: Jurassic transgressions and regressions in the Caucasus (northern Neotethys Ocean) and their influences on the marine biodiversity . — Palaeogeography , Palaeoclimatology, Palaeoecology

Restricted access

The impact of goal attainment and goal importance on satisfaction with life – a polynomial regression and response surface analysis

A célok fontosságának és megvalósulásának hatása az élettel való elégedettségre – Polynomiális regresszió analízis

Mentálhigiéné és Pszichoszomatika
Authors:
Ágnes Tóth
,
Barbara Wisse
, and
Klára Faragó

. Edwards , J.R. ( 2002 ). Alternatives to difference scores: Polynomial regression analysis and response surface methodology . In F. Drasgow & N. Schmitt (Eds.), Advances in measurement and data analysis ( 350 – 400 ). San Francisco

Restricted access

Twenty wheat varieties were analyzed to assess the contribution of 40-year breeding process to the advancement of wheat technological quality. A trial using a randomized block design with three replications was carried out during five growing seasons (2001–2005) that varied in temperature and rainfall conditions. Changes of quality were analyzed in the varieties from different breeding periods using linear regression analysis. Changes of quality indicators were expressed by regression coefficients. The studied varieties were released at 3–4-year intervals. The annual changes in genetic potentials were as follows: protein content — −0.03%, wet gluten — −0.14%, farinograph absorption — 0.04%, dough energy — 1.53 cm 2 , loaf volume — 2.94 ml, and baking score — 0.07. The decreases in the protein and wet gluten contents were compensated for by an improvement in protein quality. The increase in gluten structure stability and appropriate combinations of high molecular weight glutenin subunits have contributed to the improvement of other quality indicators.

Restricted access

Abstract  

In principle, the kinetic analysis of thermal effects has limitations when based on a single measurement. Using a simulated example and the dehydration of Ca(OH)2 , it will be shown that, through the simultaneous application of non-linear regression to several measurements run at different heating rates (multivariate non-linear regression), the difficult problem of determining the probable reaction type can be reliably solved.

Restricted access

Compilation of a homogenous earthquake catalogue, by expressing the size of the earthquakes in a unified magnitude scale, is an important tool for the seismic hazard evaluation. The most reliable and useful scale of magnitude to be chosen as the common measure of earthquake size, for both historically known and the instrumentally recorded events, is the moment magnitude, M W . We investigate the empirical relationships between local magnitudes ( M L ) calculated by the seismological agencies operating in the Western Balkan countries, and the relevant moment magnitude M W , derived from the moment tensor analysis of medium-strong Western Balkan earthquakes. As result, regression relations converting M L to M W for these countries have been derived. Based on the proposed relations, an estimate of M W which can be considered as a unified magnitude scale can be calculated for each earthquake of the regional catalogue.

Restricted access

Abstract  

This paper reports the results of an empirical study on the impact of three proximity measures: geographical distance, thematic distance and socio-economic distance among the set of 45 scientifically most advanced countries on their cooperation network. In network data, individuals (viz. countries) are linked to one another and the relationships are nested and embedded in groups, with the result that statistical assumptions of independence underlying ordinary least squares regression are systematically violated. Hence, we have used a non-parametric regression procedure, Quadratic Assignment Procedure (QAP), for regressing the matrix of transnational cooperation on the matrices of three proximity measures: geographic proximity, thematic proximity and socio-economic proximity. The results indicate that all the three proximity measures have the expected negative effect on transnational cooperation. Geographic proximity has greater impact than the other proximity measures.

Restricted access

In the region of the Carpathian-Pannonian Basin (44–50N; 13–28E) 81 earthquakes have moment magnitude (M w); 61 of them are crustal events (focal depth <65 km) while 20 earthquakes belong to the intermediate focal depth region of the Vrancea (Romania) zone. For crustal events the regression of moment magnitude (M w) on local magnitude (M l) shows a better fit for large magnitudes using a second order equation against to a linear relationship, and the actual quadratic formula based on 61 events is the following: \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $\begin{gathered} M_w = 1.37( \pm 0.28) + 0.39( \pm 0.18)M_l + 0.061( \pm 0.026)M_l^2 \hfill \\ (M_w :1.9 - 5.5;M_l :1.4 - 5.5). \hfill \\ \end{gathered} $ \end{document} .In the intermediate focal depth Vrancea zone of the south-eastern bend of the Carpathians (44.5–46.5N; 25.5–28.0E) the number of body wave magnitudes is the largest one (20) among the local (8), the surface wave (14) and the duration (17) magnitudes. The linear relationship between the moment (M w) and the body wave (M b) magnitudes has the following form: \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $M_w = 1.20( \pm 0.08)M_b - 0.76( \pm 0.40)(M_w :4.1 - 7.7;M_b :3.8 - 7.3).$ \end{document} .The relationships of the different (M l, M s, M b, M d) magnitudes are also presented in the paper.

Restricted access

López-Blázquez and Weso lowski [6] introduced the top-k-lists sequence of random vectors and elaborated the usefulness of such data. They also developed the distribution of top-k-lists and their properties arising from various probability distributions, such as standard exponential distribution and uniform distribution on (0, 1). In this paper, we study the linearity of regressions inside top-k-lists and then based on this study we present characterizations of certain distributions.

Restricted access

models [ 9 , 12–14 ] as well as calculating the root mean square error (RMSE), etc. In the present study linear regression models as a simple approach for predicting the LRIs in gas chromatographic analysis of volatile components of essential oils for

Open access