نتایج جستجو برای: periodic trend

تعداد نتایج: 204406  

Journal: :Environmental monitoring and assessment 2013
U Pinto B L Maheshwari R L Ollerton

The Hawkesbury-Nepean River (HNR) system in South-Eastern Australia is the main source of water supply for the Sydney Metropolitan area and is one of the more complex river systems due to the influence of urbanisation and other activities in the peri-urban landscape through which it flows. The long-term monitoring of river water quality is likely to suffer from data gaps due to funding cuts, ch...

Journal: :SIAM Review 2009
Seung-Jean Kim Kwangmoo Koh Stephen P. Boyd Dimitry M. Gorinevsky

The problem of estimating underlying trends in time series data arises in a variety of disciplines. In this paper we propose a variation on Hodrick–Prescott (H-P) filtering, a widely used method for trend estimation. The proposed !1 trend filtering method substitutes a sum of absolute values (i.e., !1 norm) for the sum of squares used in H-P filtering to penalize variations in the estimated tre...

Journal: :J. Comb. Theory, Ser. A 1975
Robert A. Meyer

where A1 = {x : 0 ≤ x < p, p f1(x)f2(x)} . In order to do this, Burgess found estimates for the inner summation over various subsets of A1 and then counted the number of m for which these subsets were non-empty. The counting process was carried out using different methods, one of which concerned the estimation of the cardinality of S = {m : 0 < mi ≤ h, f1(X) ≡ f2(X) (mod pμ)} . The estimation o...

Journal: :Communications in Statistics - Simulation and Computation 2008
Abdelhakim Aknouche Hacène Belbachir Fayçal Hamdi

An analytically simple and tractable formula for the start-up autocovariances of periodic ARMA (P ARMA) models is provided.

Journal: :medical journal of islamic republic of iran 0
nasim vahabi department of biostatistics, faculty of medical sciences, tarbiat modares university, tehran, iran.سازمان اصلی تایید شده: دانشگاه تربیت مدرس (tarbiat modares university) anoshirvan kazemnejad department of biostatistics, faculty of medical sciences, tarbiat modares university, tehran, iran.سازمان اصلی تایید شده: دانشگاه تربیت مدرس (tarbiat modares university) ramazan fallah department of biostatistics, faculty of medical sciences, tarbiat modares university, tehran, iran.سازمان اصلی تایید شده: دانشگاه تربیت مدرس (tarbiat modares university)

background: growth failure in children less than five years old can lead to the serious complications such as increased mortality, learning difficulties or physical disability. the aim of this study was to investigate the non-organic factors affecting the growth trend in less than two years children living in zanjan, iran.   methods: this longitudinal study was conducted on a sample of 3566 chi...

2001
D. S. G. Pollock

The problem of trend estimation in econometrics has had a long history, and the techniques which can be deployed have been evolving gradually over many years. The forces of evolution have been twofold. On one hand is the gradual improvement in statistical and computational techniques which has been accompanied by improvements in the processing power of computers and in the accessibility of soft...

Journal: :Library Trends 2000
Sandra Ríos Balderrama

THEWORK OF DIVERSITY IN LIBRARIES BEGINS at the crossroad where superiority, inaction, and denial become intolerable. Yet in working toward true diversity, we work without the familiar construct of a mainstream. We respond to, or ignore, repetitive critique of being too exclusive or not inclusive enough. We decide whether it is appropriate to quantify the existence of a people or to trust what ...

2007
Seung-Jean Kim Kwangmoo Koh Stephen Boyd Dimitry Gorinevsky

The problem of estimating underlying trends in time series data arises in a variety of disciplines. In this paper we propose a variation on Hodrick-Prescott (H-P) filtering, a widely used method for trend estimation. The proposed l1 trend filtering method substitutes a sum of absolute values (i.e., an l1-norm) for the sum of squares used in H-P filtering to penalize variations in the estimated ...

2006
Samuel Gaisie

The study traces the likely route of the movement of fertility through the demographic transition. The information is critical for construction of population projections as well as for monitoring and evaluating action programmes The original P/F ratio method and modified versions, one through the intermediary of relational Gompertz model , for analysing birth history data, are employed in asses...

2005
Karen A. Kopecky

A model with leisure production and endogenous retirement is used to explain the declining labor force participation rates of elderly males. The model is calibrated to cross-sectional data on the labor force participation rates of elderly US males by age, their median drop in market consumption and leisure good expenditure share in the year 2000. Running the calibrated model for the period 1850...

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