Testing and dating of structural changes in practice

Zeileis, Achim; Kleiber, Christian; Krämer, Walter; Hornik, Kurt

doi:10.1016/s0167-9473(03)00030-6

Cited by 667 publications

(485 citation statements)

References 26 publications

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“…MSC analyses, including estimation of the optimal number of breakpoints with the Bayesian information criterion (BIC) and estimation of breakpoint positions with their 95 % confidence intervals (CI) for all cell length profiles were performed using the breakpoints function of the R 'strucchange' package (Zeileis et al, 2002(Zeileis et al, , 2003. The breakpoints function estimates multiple breakpoints simultaneously, implementing an algorithm that obtains global minimizers of the sum of squared residuals (Bai and Perron, 2003).…”

Section: Quantitative Analysismentioning

confidence: 99%

Longitudinal zonation pattern inArabidopsisroot tip defined by a multiple structural change algorithm

Pacheco-Escobedo

Ivanov

Ransom-Rodríguez

et al. 2016

Ann Bot

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Background and Aims The Arabidopsis thaliana root is a key experimental system in developmental biology. Despite its importance, we are still lacking an objective and broadly applicable approach for identification of number and position of developmental domains or zones along the longitudinal axis of the root apex or boundaries between them, which is essential for understanding the mechanisms underlying cell proliferation, elongation and differentiation dynamics during root development.Methods We used a statistics approach, the multiple structural change algorithm (MSC), for estimating the number and position of developmental transitions in the growing portion of the root apex. Once the positions of the transitions between domains and zones were determined, linear models were used to estimate the critical size of dividing cells (L critD ) and other parameters.Key Results The MSC approach enabled identification of three discrete regions in the growing parts of the root that correspond to the proliferation domain (PD), the transition domain (TD) and the elongation zone (EZ). Simultaneous application of the MSC approach and G2-to-M transition (CycB1;1DB:GFP) and endoreduplication (pCCS52A1:GUS) molecular markers confirmed the presence and position of the TD. We also found that the MADS-box gene XAANTAL1 (XAL1) is required for the wild-type (wt) PD increase in length during the first 2 weeks of growth. Contrary to wt, in the xal1 loss-of-function mutant the increase and acceleration of root growth were not detected. We also found alterations in L critD in xal1 compared with wt, which was associated with longer cell cycle duration in the mutant.Conclusions The MSC approach is a useful, objective and versatile tool for identification of the PD, TD and EZ and boundaries between them in the root apices and can be used for the phenotyping of different genetic backgrounds, experimental treatments or developmental changes within a genotype. The tool is publicly available at www.ibiologia.com.mx/MSC_analysis.

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Section: Quantitative Analysismentioning

confidence: 99%

Longitudinal zonation pattern inArabidopsisroot tip defined by a multiple structural change algorithm

Pacheco-Escobedo

Ivanov

Ransom-Rodríguez

et al. 2016

Ann Bot

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“…The maximum number of breaks m is set to 2 in our model because the recursive estimates test (Ploberger et al, 1989) and F statistics test (Andrews, 1993) suggested that m = 2 is the favored model compared with other models. After setting m to 2, the statistically optimal number of breaks was identified when the residual sum of squares (RSS) and the Bayesian information criterion (BIC) became the smallest (see Zeileis et al, 2003). For the BP procedure, we mostly followed the explanation given in Zeileis et al (2003).…”

Section: Methodsmentioning

confidence: 99%

“…After setting m to 2, the statistically optimal number of breaks was identified when the residual sum of squares (RSS) and the Bayesian information criterion (BIC) became the smallest (see Zeileis et al, 2003). For the BP procedure, we mostly followed the explanation given in Zeileis et al (2003).…”

Section: Methodsmentioning

confidence: 99%

The U.S. shale gas revolution and its effect on international gas markets

Aruga

2016

Journal of Unconventional Oil and Gas Resources

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This paper investigated whether the effect of the shale gas revolution on the U.S. gas market is still a domestic phenomenon or this revolution is influencing the global natural gas market. We used the Bai-Perron test to identify the break date related to the shale gas revolution and tested the price linkages among the U.S., European and Japanese gas markets for the periods before and after this break date. The result indicated that the U.S. gas market had a price linkage with the international market for the period before the revolution affected the U.S. gas production, but this price linkage disappeared for the period after the revolution. This result implied that the U.S. gas market became independent after the shale gas revolution occurred and that the price linkage between the U.S. and international gas market became weaker after the shale gas revolution occurred.

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“…To ensure that growth transitions are not confounded with business cycles, for our data the search utilizes a parameter of ε = 0.15, corresponding to the minimal size of h = 15 yearly observations; this amounts to allowing simultaneous calculation for up to m = 5 breaks. The technique suggested by BP has been implemented in a unified way in the package strucchange (Zeileis et al 2002(Zeileis et al , 2003Zeileis and Kleiber 2005) for the statistical software R (http://www.R-project.org/), which is the one upon which we rely in the present study. 13 The two World Wars periods 1914-1921 and 1940-1950, marked as shaded areas in the figure, have been excluded from calculations in order to avoid significant reductions in power of the test.…”

Section: Yearmentioning

confidence: 99%

Growth and Cycles of the Italian Economy Since 1861: The New Evidence

Clementi

Gallegati

2014

Ital Econ J

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Based on a newly-available large set of historical national accounts, the paper revisits the main features of economic growth and cycles in Italy for the postUnification period 1861-2011. Alongside the structural changes in growth dynamics, the main sources of output and productivity growth are identified. As regards the analysis of the underlying cyclical component, a business cycle chronology is first established and then both the specific patterns of individual cycles and the co-movements of output with key macroeconomic variables are investigated. In the 150 years since its political Unification, Italy's economic growth was mainly propelled by consumption and investments, whereas on the supply side the industry and services sectors were by far the main contributors, also because of the positive effect of labour reallocation to nonfarm activities. Over the same period, Italy experienced approximately 20 business cycles of varying duration and amplitude. Output fluctuations were dominated by the short-term variability of agricultural production before World War II and by fluctuaEarlier drafts of this paper were presented at the study day in honour of Guido M. Rey "L'economia italiana: modelli, misurazione e nodi strutturali" (Università degli Studi Roma Tre, 5 March 2010) and the conference "Sviluppo economico e benessere" (Università Politecnica delle Marche, Ancona, 5 and 6 November 2010). We are grateful to all the participants for their useful comments. We also thank Alberto Baffigi for his precious help with the historical sources used, and Claire Giordano and Francesco Zollino for sharing their data with us upon request. Last, but not least, we thank two anonymous reviewers for their thorough review and highly valuable comments and suggestions, which significantly contributed to improving the quality of the paper. The usual caveats apply. tions of the industry sector thereafter. The cyclical behaviour exhibited by aggregate demand components conforms quite well to that evidenced in the standard international business cycle literature, although some exceptions arise in the pre-World War II years.

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Testing and dating of structural changes in practice

Cited by 667 publications

References 26 publications

Longitudinal zonation pattern inArabidopsisroot tip defined by a multiple structural change algorithm

Longitudinal zonation pattern inArabidopsisroot tip defined by a multiple structural change algorithm

The U.S. shale gas revolution and its effect on international gas markets

Growth and Cycles of the Italian Economy Since 1861: The New Evidence

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