Dr Nickolay Trendafilov

Some inequalities contrasting principal component and factor analyses solutions (2019-06-01)
Adachi, Kohei and Trendafilov, Nickolay T.
Japanese Journal of Statistics and Data Science, 2(1) (pp. 31-47)

Semi-sparse PCA (2019-03-31)
Eldén, Lars and Trendafilov, Nickolay
Psychometrika, 84(1) (pp. 164-185)

Exploratory factor analysis of large data matrices (2019-02)
Trendafilov, Nickolay T. and Fontanella, Sara
Statistical Analysis and Data Mining, 12(1) (pp. 5-11)

Simple Structure Detection Through Bayesian Exploratory Multidimensional IRT Models (2019)
Fontanella, Lara; Fontanella, Sara; Valentini, Pasquale and Trendafilov, Nickolay
Multivariate Behavioral Research, 54(1) (pp. 100-112)

Clustered Common Factor Exploration in Factor Analysis (2019)
Uno, Kohei; Adachi, Kohei and Trendafilov, Nickolay T.
Psychometrika, 84(4) (pp. 1048-1067)

Sparsest factor analysis for clustering variables: a matrix decomposition approach (2018-09)
Adachi, Kohei and Trendafilov, Nickolay T.
Advances in Data Analysis and Classification, 12(3) (pp. 559-585)

Some Mathematical Properties of the Matrix Decomposition Solution in Factor Analysis (2018-06)
Adachi, Kohei and Trendafilov, Nickolay
Psychometrika, 83(2) (pp. 407-424)

Archetypal Analysis: Mining Weather and Climate Extremes (2017-09)
Hannachi, A. and Trendafilov, N.
Journal of Climate, 30(17) (pp. 6927-6944)

Sparse Exploratory Factor Analysis (2017-07-13)
Trendafilov, Nickolay T.; Fontanella, Sara and Adachi, Kohei
Psychometrika, 82(3) (pp. 778-794)

Sparse principal component analysis subject to prespecified cardinality of loadings (2016-12)
Adachi, Kohei and Trendafilov, Nickolay T.
Computational Statistics, 31(4) (pp. 1403-1427)

Sparse PCA and investigation of multielements compositional repositories: theory and applications (2016-09)
Gallo, Michele; Trendafilov, Nickolay and Buccianti, Antonella
Environmental and Ecological Statistics, 23(3) (pp. 421-434)

Recipes for sparse LDA of horizontal data (2016)
Trendafilov, Nickolay T. and Gebru, Tsegay Gebrehiwot
METRON, 74 (pp. 207-221)

Sparse versus simple structure loadings (2015-09)
Trendafilov, Nickolay T. and Adachi, Kohei
Psychometrika, 80(3) (pp. 776-790)

From simple structure to sparse components: a review (2014-06)
Trendafilov, Nickolay T.
Computational Statistics, 29(3-4) (pp. 431-454)

Sparse matrices in data analysis (2014-06)
Trendafilov, Nickolay; Kleinsteuber, Martin and Zou, Hui
Computational Statistics, 29(3-4) (pp. 403-405)

A clustering approach to interpretable principal components (2013-12-12)
Enki, Doyo G.; Trendafilov, Nickolay T. and Jolliffe, Ian T.
Journal of Applied Statistics, 40(3) (pp. 583-599)

Exploratory factor and principal component analyses: some new aspects (2013-03)
Trendafilov, Nickolay; Unkel, Steffen and Krzanowski, Wojtek
Statistics and Computing, 23(2) (pp. 209-220)

Zig-zag exploratory factor analysis with more variables than observations (2013-02)
Unkel, Steffen and Trendafilov, Nickolay T.
Computational Statistics, 28(1) (pp. 107-125)

Dindscal: direct INDSCAL (2012)
Trendafilov, Nickolay
Statistics and Computing, 22(2) (pp. 445-454)

Sparse principal components by semi-partition clustering (2012)
Enki, Doyo G. and Trendafilov, Nickolay T.
Computational Statistics, 27(4) (pp. 605-626)

Independent component analysis for three-way data with an application from atmospheric science (2011)
Unkel, Steffen; Hannachi, Abdel; Trendafilov, Nickolay T. and Jolliffe, Ian T.
Journal of Agricultural, Biological, and Environmental Statistics, 16(3) (pp. 319-338)

Exploratory factor analysis of data matrices with more variables than observations (2011)
Trendafilov, Nickolay T. and Unkel, Steffen
Journal of Computational and Graphical Statistics, 20(4) (pp. 874-891)

A majorization algorithm for simultaneous parameter estimation in robust exploratory factor analysis (2010-12-01)
Unkel, S. and Trendafilov, N. T.
Computational Statistics and Data Analysis, 54(12) (pp. 3348-3358)

Stepwise estimation of common principal components (2010-12-01)
Trendafilov, Nickolay
Computational Statistics and Data Analysis, 54(12) (pp. 3446-3457)

Independent exploratory factor analysis with application to atmospheric science data (2010-11)
Unkel, Steffen; Trendafilov, Nickolay T.; Hannachi, Abdel and Jolliffe, Ian T.
Journal of Applied Statistics, 37(11) (pp. 1847-1862)

Eco-effcency: concept, approaches and assessment (2010-09-29)
Kostova, Snezhanka; Trendafilov, Nickolay; Popova, Silviya and Georgieva, Nonka
Bulgarian Journal of Meteorology and Hydrology, 15(1) (pp. 118-128)

Simultaneous parameter estimation in exploratory factor analysis: an expository review (2010)
Unkel, Steffen and Trendafilov, Nickolay T.
International Statistical Review, 78(3) (pp. 363-382)

Eco-efficiency: concept, approaches and assessment (2010)
Kostova, Snezhanka; Trendafilov, Nickolay; Popova, Silviya and Georgieva, Nonka
Bulgarian Journal of Meteorology and Hydrology, 15(1) (pp. 118-128)

Independent component analysis of climate data: a new look at EOF rotation (2009-06)
Hannachi, A.; Unkel, S.; Trendafilov, N. T. and Joliffe, I. T.
Journal of Climate, 22(11) (pp. 2797-2812)

Simple and interpretable discrimination (2009)
Trendafilov, N. T. and Vines, K.
Computational Statistics and Data Analysis, 53(4) (pp. 979-989)

DALASS: Variable selection in discriminant analysis via the LASSO (2007-05)
Trendafilov, Nickolay T. and Jolliffe, Ian T.
Computational Statistics and Data Analysis, 51(8) (pp. 3718-3736)

The Dynamical System Approach to Multivariate Data Analysis (2006-09)
Trendafilov, Nickolay T.
Journal of Computational and Graphical Statistics, 15(3) (pp. 628-650)

Projected gradient approach to the numerical solution of the SCoTLASS (2006-01-10)
Trendafilov, Nickolay T. and Jolliffe, Ian T.
Computational Statistics and Data Analysis, 50(1) (pp. 242-253)

In search of simple structures in climate: Simplifying EOFs (2006)
Hannachi, A.; Jolliffe, I. T.; Stephenson, D. B. and Trendafilov, N.
International Journal of Climatology, 26(1) (pp. 7-28)

Independent component analysis as a rotation method: A very different solution to Thurstone's box problem (2005-11)
Jennrich, Robert I. and Trendafilov, Nickolay T.
British Journal of Mathematical and Statistical Psychology, 58(2) (pp. 199-208)

Fitting the factor analysis model in ℓ₁ norm (2005-05)
Trendafilov, Nickolay T.
British Journal of Mathematical and Statistical Psychology, 58(1) (pp. 19-31)

The ℓ 1 oblique procrustes problem (2004)
Trendafilov, Nickolay T. and Watson, G. A.
Statistics and Computing, 14(1) (pp. 39-51)

A modified principal component technique based on the LASSO (2003-09-01)
Jolliffe, I.T.; Trendafilov, N.T. and Uddin, M.
Journal of Computational and Graphical Statistics, 12(3) (pp. 531-547)

Dynamical system approach to factor analysis parameter estimation (2003-05)
Trendafilov, Nickolay T.
British Journal of Mathematical and Statistical Psychology, 56(1) (pp. 27-46)

On the ℓ₁ Procrustes problem (2003)
Trendafilov, Nickolay T.
Future Generation Computer Systems, 19(7) (pp. 1177-1186)

The multimode Procrustes problem (2002-07-01)
Trendafilov, Nickolay T. and Lippert, Ross A.
Linear Algebra and its Applications, 349(1-3) (pp. 245-264)

GIPSCAL revisited. A projected gradient approach (2002)
Trendafilov, Nickolay T.
Statistics and Computing, 12(2) (pp. 135-145)

The orthogonally constrained regression revisited (2001-12-01)
Chu, M.T. and Trendafilov, N.T.
Journal of Computational and Graphical Statistics, 10(4) (pp. 746-771)

A continuous-time approach to the oblique Procrustes problem (1999)
Trendafilov, Nickolay T.
Behaviormetrika, 26(2) (pp. 167-181)

On a differential equation approach to the weighted orthogonal Procrustes problem (1998)
Trendafilov, Nickolay T. and Chu, Moody T.
Statistics and Computing, 8(2) (pp. 125-133)

ORTHOMAX rotation problem. a differential equation approach (1998)
Trendafilov, Nickolay T. and Chu, Moody T.
Behaviormetrika, 25(1) (pp. 13-23)

Iterative majorizing rotation to orthogonal simple structure solution (1996)
Trendafilov, Nickolay
Multivariate Behavioral Research, 31(3) (pp. 271-287)

A simple method for procrustean rotation in factor analysis using majorization theory (1994)
Trendafilov, Nickolay
Multivariate Behavioral Research, 29(4) (pp. 385-408)

Factor analysis as data matrix decomposition: a new approach for quasi-sphering in noisy ICA (2009)
Unkel, Steffen and Trendafilov, Nickolay
In: Adali, Tülay; Jutten, Christian; Romano, João MarcosTravassos and Barros, Allan Kardec eds. Independent Component Analysis and Signal Separation: 8th International Conference, ICA 2009, Paraty, Brazil, March 15-18, 2009. Proceedings. Lecture Notes in Computer Science (5441) (pp. 163-170)
ISBN : 978-3-642-00599-2 | Publisher : Springer | Published : Berlin

Noisy independent component analysis as a method of rotating the factor scores (2007)
Unkel, Steffen and Trendafilov, Nickolay T
In: Davies, Mike E; James, Christopher J; Abdallah, Samer A and Plumbley, Mark D eds. Independent Component Analysis and Signal Separation: 7th International Conference, ICA 2007, London, UK, September 9-12, 2007. Proceedings. Lecture Notes in Computer Science (4666) (pp. 810-817)
ISBN : 978-3-540-74493-1 | Publisher : Springer | Published : Berlin

Principal component analysis applied to harbour porpoise fatty acid data (2007)
Joliffe, I.T.; Learmouth, J.A.; Pierce, G.J.; Santos, M.B.; Trendafilov, N.; Zuur, A.F.; Ieno, E.N. and Smith, G.M.
In: Zuur, Alain F.; Ieno, Elena N. and Smith, Graham M. eds. Analysing Ecological Data. Statistics for biology and health (pp. 515-528)
ISBN : 978-0-387-45967-7 | Publisher : Springer | Published : New York

Feature extraction by the SCoTLASS: an illustrative example (2005)
Bartkowiak, Anna and Trendafilov, Nickolay
In: Klopotek, Mieczyslaw A; Wierzchen, Slawomir T. and Trojanowski, Krzysztof eds. Intelligent Information Processing and Web Mining. Advances in Intelligent and Soft Computing (31) (pp. 3-11)
ISBN : 978-3-540-25056-2 | Publisher : Springer | Published : Berlin

Orthonormality-constrained INDSCAL with nonnegative saliences (2004)
Trendafilov, Nickolay
In: Lagan'a, Antonio; Gavrilova, Marina L.; Kumer, Vipin; Mun, Youngsong; Kenneth Tan, C. J. and Gervasi, Osvaldo eds. Computational Science and Its Applications - ICCSA 2004. Lecture Notes in Computer Science (3044) (pp. 952-960)
ISBN : 9783540220565 | Publisher : Springer | Published : Berlin, Germany

Sparse exploratory factor analysis (2014)
Fontanella, Sara; Trendafilov, Nickolay and Adachi, Kohei
In : COMPSTAT 2014: 21st International Conference on Computational Statistics (19 - -22 Aug 2014, Geneva, Switzerland) (pp. 281-288)

Penalty-free sparse PCA (2014)
Trendafilov, Nickolay and Adachi, Kohei
In : Proceedings of COMPSTAT 2014: 21st International Conference on Computational Statistics (Aug 19 - -22 2014, Geneva, Switzerland) (pp. 197-203)