World Library  



Modern Regression


In statistics, regression analysis includes any techniques for modelling and analyzing several variables, when the focus is on the relationship between a dependent variable and one or more independent variables. More specifically, regression analysis helps us understand how the typical value of the dependent variable changes when any one of the independent variables is varied, while the other independent variables are held fixed.

 
  • Cover Image

The Characteristics of Field-aligned Currents Associated with Equa...

By: C. Stolle; M. Rother; H. Lühr; J. Park; K. W. Min; I. Michaelis

Description: Helmholtz-Center Potsdam (GFZ), German Research Center for Geosciences, Telegrafenberg, 14473 Potsdam, Germany. Field-aligned currents (FACs) generate magnetic deflections perpendicular to the ambient Earth magnetic field. We investigate the characteristics of FACs associated with equatorial plasma bubbles (EPBs) as deduced from magnetic field measurements by the CHAMP satellite. Meridional magnetic deflections inside EPBs show a clear hemispheric anti-sy...

Aggson, T L., Burke, W J., Maynard, N C., Hanson, W B., Anderson, P C., Slavin, J A., Hoegy, W R., and Saba, J L.: Equatorial bubbles updrifting at supersonic speed, J. Geophys. Res., 97, 8581–8590, 1992.; Anderson, D N. and Mendillo, M.: Ionospheric conditions affecting the evolution of equatorial plasma depletions, Geophys. Res. Lett., 10, 541–544, 1983.; Argo, P E. and Kelley, M C.: Digital ionosonde observations during equatorial spread F, J. Geophys. Res., 91, 5539–...

Read More
  • Cover Image

The Characteristics of Field-aligned Currents Associated with Equa...

By: C. Stolle; M. Rother; H. Lühr; J. Park; K. W. Min; I. Michaelis

Description: Helmholtz-Center Potsdam (GFZ), German Research Center for Geosciences, Telegrafenberg, 14473 Potsdam, Germany. Field-aligned currents (FACs) generate magnetic deflections perpendicular to the ambient Earth magnetic field. We investigate the characteristics of FACs associated with equatorial plasma bubbles (EPBs) as deduced from magnetic field measurements by the CHAMP satellite. Meridional magnetic deflections inside EPBs show a clear hemispheric anti-sy...

Aggson, T L., Burke, W J., Maynard, N C., Hanson, W B., Anderson, P C., Slavin, J A., Hoegy, W R., and Saba, J L.: Equatorial bubbles updrifting at supersonic speed, J. Geophys. Res., 97, 8581–8590, 1992.; Anderson, D N. and Mendillo, M.: Ionospheric conditions affecting the evolution of equatorial plasma depletions, Geophys. Res. Lett., 10, 541–544, 1983.; Argo, P E. and Kelley, M C.: Digital ionosonde observations during equatorial spread F, J. Geophys. Res., 91, 5539–...

Read More
  • Cover Image

Giant Disturbance in the Ionospheric F2 Region Prior to the M8.0 W...

By: Z. Wu; Y. Hu; J. Feng; J. Wu; Y. Suo; T. Xu

Description: School of Science, Xidian University, Xi'an 710071, China. On 12 May 2008 at 14:28 LT great earthquake (M=8.0) occurred at Wenchuan (31.00° N, 103.40° E), China. The hourly values of foF2 are analyzed over ten ionospheric observatories: Haikou (20.00° N, 110.33° E), Kunming (25.00° N, 102.70° E), Guangzhou (20.00° N, 113.70° E), Chongqing (29.50° N, 106.40° E), Lhasa (29.63° N, 91.17° E), Lanzhou (36.07° N, 103.87° E), Beijing (40.00° N, 1...

Barnes, R. A. and Leonard, R. S.: Observations of ionospheric disturbances following the Alaska earthquake, J. Geophys. Res., 70, 1250–1253, 1965.; Belehaki, A., Moraitis, G., and Tsagouri, I.: On the deviation of an hourly local index to define the normal ionosphere, Ann. Geofis., 43, 189–203, 2000.; Cander, L. R. and Mihajlovic, S. J.: Forecasting of the ionospheric structure during the great geomagnetic storm, J. Geophys. Res., 103, 391–398, 1998.; Dabas, R. S., Rupes...

Read More
  • Cover Image

Secular Trends in Storm-level Geomagnetic Activity : Volume 29, Is...

By: J. J. Love

Description: Geomagnetism Program, US Geological Survey, Denver, CO, USA. Analysis is made of K-index data from groups of ground-based geomagnetic observatories in Germany, Britain, and Australia, 1868.0–2009.0, solar cycles 11–23. Methods include nonparametric measures of trends and statistical significance used by the hydrological and climatological research communities. Among the three observatory groups, German K data systematically record the highest dis...

Bartels, J.: Terrestrial-magnetic activity and its relations to solar phenomena, Terr. Magn. Atmos. Electr., 37, 1–52, 1932.; Bartels, J.: Discussion of time-variations of geomagnetic activity indices \it Kp and \it Ap, 1932–1961, Ann. Geophys., 19, 1–20, 1963.; Bartels, J., Heck, N. H., and Johnston, H. F.: The three-hour range index measuring geomagnetic activity, Terr. Magn. Atmos. Electr., 44, 411–454, 1939.; Bartels, J., Heck, N. H., and Johnston, H. F.: Geomagnetic...

Read More
  • Cover Image

A Brief Review on the Presentation of Cycle 24, the First Integrat...

By: P. X. Gao; L. S. Zhan; H. F. Liang; W. Feng; K. J. Li

Description: National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China. The status of the extended solar activity minimum, since the second half of 2007, has been briefly instructed to the solar-terrestrial community. Cycle 24 has the most spotless days since cycle 16, and probably even since the modern cycles, latitudes of high-latitude (>35°) sunspots belonging to a new cycle around the minimum time of the cycle are ...

Antia, H. M., Basu, S., and Chitre, S. M.: Solar Rotation Rate and Its Gradients During Cycle 23, ApJ, 681, 680–692, 2008.; Babcock, H. W.: The topology of the Sun's magnetic field and the 22-year cycle, Astrophys. J., 133, 572–587, 1961.; Basu, S. and Antia, H. M.: Changes in Solar Dynamics from 1995 to 2002, ApJ, 585, 553–565, 2003.; Choudhuri, A. R., Chatterjee, P., and Jian, J.: Predicting Solar Cycle 24 With a Solar Dynamo Model, Phys. Rev. Lett., 98, 131103,

Read More
  • Cover Image

Correction of Artificial Jumps in the Historical Geomagnetic Measu...

By: P. Ribeiro; M. A. Pais; A. L. Morozova

Description: Centre for Geophysics of the University of Coimbra, University of Coimbra, Coimbra, Portugal. The Coimbra Magnetic Observatory (International Association of Geomagnetism and Aeronomy code COI) in Portugal has a long history of observation of the geomagnetic field, spanning almost 150 yr since the first geomagnetic measurements in 1866. These long instrumental geomagnetic records provide very important information about variability of geomagnetic elements...

Alexandersson, H. and Moberg, A.: Homogenization of swedish temperature data. Part I: Homogeneity test for linear trends, Int. J. Climatol., 17, 25–34, 1997.; Alexandrescu, M., Gibert, D., Hulot, G., LeMouël, J.-L., and Saracco, G.: Worldwide wavelet analysis of geomagnetic jerks, J. Geophys. Res., 101, 21975–21994, 1996.; Beggan, C. and Whaler, K.: Forecasting secular variation using core flows, Earth Planet. Space, 62, 821–828, 2010.; Buishand, T.: Some methods for tes...

Read More
  • Cover Image

Inter-annual Variations in Wave Spectral Characteristics at a Loca...

By: M. Anjali Nair; V. Sanil Kumar

Description: Ocean Engineering, CSIR-National Institute of Oceanography (Council of Scientific & Industrial Research) Dona Paula, Goa 403 004, India. The inter-annual variations in wave spectrum are examined based on the wave data measured at 9 m water depth off the central west coast of India from 2009 to 2012 using a wave rider buoy. The temporal variation of the spectral energy density over a calendar year indicates similar variation in all the four years studied....

Aboobacker, V. M., Seemanth, M., Samiksha, S. V., Sudheesh, K., Jyoti, K., and Vethamony, P.: Sea breeze-induced wind sea growth in the central west coast of India, Ocean Eng., 84, 20–28, 2014.; Anoop, T. R., Kumar, V. S., and Shanas, P. R.: Spatial and temporal variation of surface waves in shallow waters along eastern Arabian Sea, Ocean Eng., 81, 150–157, doi:10.1016/j.oceaneng.2014.02.010, 2014.; Baba, M., Dattatri,, J., and Abraham, S.: Ocean wave spectra off Cochin,...

Read More
  • Cover Image

Measuring Hydrodynamics and Sediment Transport Processes in the De...

By: A. Souza; R. Bolaños

Description: National Oceanography Centre, Joseph Proudman Building, 6 Brownlow Street, Liverpool, L3 5DA, UK. The capability of monitoring and prediction in the marine environment provides information that may allow sustainable development of coastal and offshore regions. Therefore, the continuous measurement of environmental processes becomes an important source of information. The present paper shows data collected during 6 years, and in particular during 2008, in...

Baumert, H., Chapalain, G., Smaoui, H., McManus, J. P., Yagi, H., Regener, M., Sundermann, J., and Szilagy, B.: Modelling and numerical simulation of turbulence, waves and suspended sediments for pre-operational use in coastal seas, Coast. Eng., 41, 63–93, 2000.; Betteridge, K. F. E., Thorne, P. D., and Cook, R. D.: Calibrating multi-frequency acoustic backscatter system for studying near-bed suspended sediment transport processes, Cont. Shelf Res., 28, 227–235, 2008.; B...

Read More
  • Cover Image

A Mass Conservative and Water Storage Consistent Variable Paramete...

By: E. Todini

Description: Department of Earth and Geo-Environmental Sciences, University of Bologna, Italy. The variable parameter Muskingum-Cunge (MC) flood routing approach, together with several variants proposed in the literature, does not fully preserve the mass balance, particularly when dealing with very mild slopes (<10−3). This paper revisits the derivation of the MC and demonstrates (i) that the loss of mass balance in MC is caused by the use of time variant ...

Bocquillon, C. and Moussa, R.: CMOD: Logiciel de choix de modèles d'ondes diffusantes et leur caractéristique, La Houille Blanche, 5(6), 433–437 (in French), 1988.; Cappelaere, B.: Accurate Diffusive Wave Routing, J. Hydraulic Eng., ASCE, 123(3),174–181, 1997.; Chow, V. T.: Handbook of Applied Hydrology, McGraw-Hill, New York, NY, 1964.; Chow, V. T., Maidment, D. R., and Mays, L. W.: Applied Hydrology, McGraw-Hill, New York, NY, 1988; Cunge, J. A.: On the subject of a fl...

Read More
  • Cover Image

Observed Drought and Wetness Trends in Europe: an Update : Volume ...

By: K. Fraedrich; A. Sutera; I. Bordi

Description: Department of Physics, University of Rome La Sapienza, Italy. Linear and nonlinear trends of drought and wetness are analysed in terms of the gridded Standardized Precipitation Index (SPI) determined from monthly precipitation in Europe (NCEP/NCAR). In characterizing the meteorological and hydrological aspects, the index is computed on a seasonal and on a bi-annual time scale. Two datasets are compared: one from 1949 to 1997 and the other one includes t...

Wilhite, D. A.: Combating Drought through Preparedness, Nat. Resour. Forum, 26, 275–285, 2002.; Blender, R. and Fraedrich, K.: Long term memory of the hydrological cycle and river runoffs in China in a high resolution climate model, Int. J. Climatol., 26, 1547–1565, 2006.; Bordi, I. and Sutera, A.: Fifty years of precipitation: some spatially remote teleconnnections, Water Resour. Manag., 15, 247–280, 2001.; Bordi, I. and Sutera, A.: An analysis of drought in Italy in th...

Read More
  • Cover Image

Investigation of the Direct Runoff Generation Mechanism for the An...

By: P. A. Londra; K. X. Soulis; N. Dercas; J. D. Valiantzas

Description: Agricultural University of Athens, Department of Natural Resources Management and Agricultural Engineering, Lab. of Agricultural Hydraulics, Athens, Greece. The Soil Conservation Service Curve Number (SCS-CN) method is widely used for predicting direct runoff volume for a given rainfall event. The applicability of the SCS-CN method and the direct runoff generation mechanism were thoroughly analysed in a Mediterranean experimental watershed in Greece. The...

Brocca, L., Melone, F., and Moramarco, T.: On the estimation of antecedent wetness conditions in rainfall-runoff modelling, Hydrol. Process., 22(5), 629–642, 2008.; Baltas, E. A., Dervos, N. A., and Mimikou, M. A.: Technical note: Determination of the SCS initial abstraction ratio in an experimental watershed in Greece, Hydrol. Earth Syst. Sci., 11(6), 1825–1829, 2007.; Choi, J., Engel, B. A., and Chung, H. W.: Daily streamflow modelling and assessment based on the curve...

Read More
  • Cover Image

Frozen Soil Parameterization in a Distributed Biosphere Hydrologic...

By: H. Li; L. Wang; R. Jin; T. Koike; K. Yang

Description: Dept. of Civil Engineering, the University of Tokyo, Tokyo, Japan. In this study, a frozen soil parameterization has been modified and incorporated into a distributed biosphere hydrological model (WEB-DHM). The WEB-DHM with the frozen scheme was then rigorously evaluated in a small cold area, the Binngou watershed, against the in-situ observations from the WATER (Watershed Allied Telemetry Experimental Research). First, by using the original WEB-DHM wit...

Beven, K. J.: On subsurface storm flow: an analysis of response times, Hydrol. Sci. J., 4, 505–519, 1982.; Bonan, G.: A land surface model (LSM version 1.0) for ecological, hydrological, and atmospheric studies: technical description and user's guide, NCAR Technical Note 417, NCAR, Boulder Co., USA, 1996.; Cabral, M. C., Garrote, L., Bras, R. L., and Entekhabi, D.: A kinematic model of infiltration and runoff generation in layered and sloped soils, Adv. Water Resour., 15...

Read More
  • Cover Image

Teleconnection Analysis of Runoff and Soil Moisture Over the Pearl...

By: J. Chen; B. Sivakumar; J. Niu

Description: Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China. This study explores the teleconnection of two climatic patterns, namely the El Niño–Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD), with hydrological processes over the Pearl River basin in southern China, particularly on a sub-basin-scale basis. The Variable Infiltration Capacity (VIC) model is used to simulate the daily hydrological processes over t...

Asquith, D.: Learning to live with statistics: from concept to practice, Lynne Rienner, Boulder, Colorado, 2008.; Behera, S. K., Krishnan, S., and Yamagata, T.: Unusual ocean-atmosphere conditions in the tropical Indian Ocean during 1994, Geophys. Res. Lett., 26, 3001–3004, 1999.; Chen, J. and Kumar, P.: Role of terrestrial memory in modulating ENSO impacts in North America, J. Climate, 15, 3569–3585, 2002.; Chen, J. and Kumar, P.: A modelling study of the ENSO influence...

Read More
  • Cover Image

Teleconnection Analysis of Runoff and Soil Moisture Over the Pearl...

By: J. Niu; J. Chen; B. Sivakumar

Description: Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China. This study explores the teleconnection of two climatic patterns, namely the El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD), with hydrological processes over the Pearl River basin in South China. The Variable Infiltration Capacity (VIC) model is used to simulate the daily hydrological processes over the basin for the study period 1952–200...

Asquith, D.: Learning to Live with Statistics: From Concept to Practice, Lynne Rienner, Boulder, Colorado, 2008.; Behera, S. K., Krishnan, S., and Yamagata, T.: Unusual ocean-atmosphere conditions in the tropical Indian Ocean during 1994, Geophys. Res. Lett., 26, 3001–3004, 1999.; Chen, J. and Kumar, P.: Role of terrestrial memory in modulating ENSO impacts in North America, J. Climate, 15, 3569–3585, 2002.; Chen, J. and Kumar, P.: A modelling study of the ENSO influence...

Read More
  • Cover Image

Proposal of a Lumped Hydrological Model Based on General Equations...

By: R. Medina Santamaría; R. Mínguez Solana; E. García Alonso; C. Prieto Sierra

Description: Environmental Hydraulics Institute, IH Cantabria, Santander, Spain. This paper explores a new approach to lumped hydrological modelling based on general laws of growth, in particular using the classic logistic equation proposed by Verhulst. By identifying homologies between the growth of a generic system and the evolution of the flow at the outlet of a river basin, and adopting some complementary hypotheses, a compact model with 3 parameters, exten...

Beven, K. J.: Rainfall–runoff modelling: the primer, Wiley-Blackwell, Chichester, 2012a.; Beven, K. J.: Causal models as multiple working hypotheses about environmental processes, Comptes Rendus Geoscience, 344, 77–88, 2012b.; Blumberg, A.: Logistic growth rate functions, J. Theor. Biol., 21, 42–44, 1968.; Boyle, D. P., Gupta, H. V., and Sorooshian, S.: Toward improved calibration of hydrologic models: combining the strengths of manual and automatic methods, Water Resour...

Read More
  • Cover Image

Uncertainty in Runoff Based on Global Climate Model Precipitation ...

By: R. Srikanthan; D. J. Karoly; T. A. McMahon; M. C. Peel

Description: Department of Infrastructure Engineering, University of Melbourne, 3010 Victoria, Australia. Two key sources of uncertainty in projections of future runoff for climate change impact assessments are uncertainty between Global Climate Models (GCMs) and within a GCM. Within-GCM uncertainty is the variability in GCM output that occurs when running a scenario multiple times but each run has slightly different, but equally plausible, initial conditions. ...

Anderson, T. W. and Darling, D. A.: A test of goodness of fit, J. Am. Stat. Assoc., 49, 765–769, 1954.; Bárdossy, A. and Pegram, G.: Downscaling precipitation using regional climate models and circulation patterns toward hydrology, Water Resour. Res., 47, W04505, doi:10.1029/2010WR009689, 2011.; Crosbie, R. S., Jolly, I. D., Leaney, F. W., and Petheram, C.: Can the dataset of field based recharge estimates in Australia b...

Read More
  • Cover Image

Determinants of Modelling Choices for 1-d Free-surface Flow and Er...

By: R. Moussa; B. Cheviron

Description: IRSTEA, UMR G-EAU Gestion de l'Eau, Acteurs et Usages, 361 rue Jean-François Breton, BP 5095, 34196 Montpellier CEDEX 5, France. This review paper investigates the determinants of modelling choices, for numerous applications of 1-D free-surface flow and erosion equations, across multiple spatiotemporal scales. We aim to characterize each case study by its signature composed of model refinement (Navier-Stokes: NS, Reynolds-Averaged Navier-Stokes: RANS, Sa...

Aksoy, H. and Kavvas, M. L.: A review of hillslope and watershed scale erosion and sediment transport models, Catena, 64, 247–271, 2005.; Basson, A. and Gerard-Varet, D.: Wall laws for fluid flows at a boundary with random roughness, Commun. Pur. Appl. Math., 61, 941–987, 2008.; Abbott, M. B.: Computational Hydraulics, Pitman, London, UK, 324 pp., 1979.; Abrahams, A. D. and Parsons, A. J.: Hydraulics of interrill overland flow on stone-covered desert surfaces, Catena, 23...

Read More
  • Cover Image

A Mass Conservative and Water Storage Consistent Variable Paramete...

By: E. Todini

Description: Department of Earth and Geo-Environmental Sciences, University of Bologna, Italy. The variable parameter Muskingum-Cunge (MC) flood routing approach, together with several variants proposed in the literature, does not fully preserve the mass balance, particularly when dealing with very mild slopes (<10−3). This paper revisits the derivation of the MC and demonstrates (i) that the loss of mass balance in MC is caused by the use of time variant...

Chow, V. T.: Handbook of Applied Hydrology, McGraw-Hill, NY, New York, 1964.; Cappalaere, B.: Accurate Diffusive Wave Routing, J. Hydraul. Eng.-ASCE, 123(3), 174–181, 1997.; Bocqillon, C. and Moussa, R.: CMOD: Logiciel de choix de modèles d'ondes diffusantes et leur caractéristique, La Houille Blanche, 5(6), 433–437 (in French), 1988.; Chow, V. T., Maidment, D. R., and Mays, L. W.: Applied Hydrology, McGraw-Hill, NY, New York, 1988.; Cunge, J. A.: On the subject of a flo...

Read More
  • Cover Image

Comparison of Soil Moisture Fields Estimated by Catchment Modellin...

By: S. Sinclair; W. Wagner; G. Pegram; A. Bartsch; T. Vischel

Description: Civil Engineering Programme, University of KwaZulu-Natal, Durban 4041, South Africa. The paper compares two independent approaches to estimate soil moisture at the regional scale over a 4625 km2 catchment (Liebenbergsvlei, South Africa). The first estimate is derived from a physically-based hydrological model (TOPKAPI). The second estimate is derived from the scatterometer on board on the European Remote Sensing satellite (ERS). Results show a...

Aubert D., Loumagne C., and Oudin L.: Sequential assimilation of soil moisture and streamflow data in a conceptual rainfall-runoff model, J. Hydrol., 280, 145–161, 2003.; Beven, K.: TOPMODEL: a critique, Hydrol. Process, 11(9), 1069–1086, 1997.; Beven K. and Kirkby M.: A physically-based variable contributing area model of basin hydrology, Hydrol. Sci. Bull., 24, 43–69, 1979.; Blyth, E.: Modelling soil moisture for a grassland and a woodland site in south-east England, H...

Read More
  • Cover Image

Analysis of the Runoff Generation Mechanism for the Investigation ...

By: P. A. Londra; N. Dercas; J. D. Valiantzas; K. X. Soulis

Description: Agricultural University of Athens, Department of Natural Resources Management and Agricultural Engineering, Lab. of Agricultural Hydraulics, Athens, Greece. The Soil Conservation Service Curve Number (SCS-CN) method is widely used for predicting direct runoff volume for a given rainfall event. The applicability of the SCS-CN method and the runoff generation mechanism were thoroughly analysed in a Mediterranean experimental watershed in Greece. The region...

Baltas, E. A., Dervos, N. A., and Mimikou, M. A.: Technical Note: Determination of the SCS initial abstraction ratio in an experimental watershed in Greece, Hydrol. Earth Syst. Sci., 11, 1825–1829, 2007.; Brocca, L., Melone, F., and Moramarco, T.: On the estimation of antecedent wetness conditions in rainfall-runoff modelling, Hydrol. Process., 22(5), 629–642, 2008.; Choi, J., Engel, B. A., and Chung, H. W.: Daily streamflow modelling and assessment based on the curve-nu...

Read More
 
379
|
380
|
381
|
382
|
383
Records: 7601 - 7620 of 7,677 - Pages: 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.