Marcin Kozak


Habilitation Agriculture/Agronomy, Warsaw Agricultural University (Dept. Experimental Design and Bioinformatics), 2008 (with honors)
Ph.D. Agriculture/Agronomy, Warsaw Agricultural University (Dept. Math. Stat. and Experimentation), 2002 (with honors)
MSc Agriculture, Warsaw Agricultural University (Dept. Math. Stat. and Experimentation), 2000 (with honors)

Current Position

Assistant Professor, Dept. Experimental Design and Bioinformatics, Faculty of Agriculture and Biology, Warsaw University of Life Sciences - SGGW

Previous Employment and leaves

November 14th-22nd 2010, Invited visiting professor at the Department of Genetics, Escola Superior de Agricultura Luiz de Queiroz, University of Sao Paulo, Brazil
February-June 2006, University of British Columbia, Faculty of Land and Food Systems
2003-2004, consultant in survey sampling, Central Statistical Office of Poland, Warsaw

Editor for:

Previous editorial work:

Referee for:

Most important publications:

  1. Hernandez Plazaa E., Kozak M., Navarretec L., Gonzalez-Andujar J.L. (xxxx). Tillage system did not affect weed diversity in a 23-year experiment in Mediterranean dryland. Agriculture, Ecosystems & Environment (in press).

  2. Kozak, M., Azevedo, R.A. (xxxx). Does using stepwise variable selection to build sequential path analysis models make sense? Physiologia Plantarum (in press).

  3. Sanwal, S.K., Kozak, M., Verma, M.R. (xxxx). Searching for the Optimum Multivariate Profile of an Ash Gourd [Benincasa hispida (Thunb.) Cogn.] Genotype. Acta Physiologiae Plantarum (in press).

  4. Wnuk, A., Kozak, M. (xxxx). Knowledge of and Attitude to GMO of Students of Various Specializations. Outlook on Agriculture (in press).

  5. Kozak, M. (2010). Comparison of three types of G × E performance plot for showing and interpreting genotypes’ stability and adaptability. International Journal of Plant Production 4(4), 293-301.

  6. Kozak, M. (2010). Basic principles of graphing data. Scientia Agricola. Scientia Agricola 67, 483-494.

  7. Kozak, M. (2010). Improved Scatterplot Design. IEEE Computer Graphics & Applications 30(6), 3-7.

  8. Kozak, M. (2010). Visualizing adaptation of genotypes with a ternary plot. Chilean Journal of Agricultural Research (in press).

  9. Durai, A.A., Kozak, M., Verma, M.R., Gupta, S., Pattanayak, A. (2009). Genetic analysis of panicle and physiological traits in hill rice grown in mid altitudes of northeastern India. Acta Physiologiae Plantarum, 31(4), 797-803.

  10. Gupta, S., Kozak, M., Sahay, G., Durrai, A.A., Mitra, J., Verma, M.R., Pattanayak, A., Thongbam, P.D., and Das, A. (2009). Genetic Parameters of Selection and Stability and Identification of Divergent Parents for Hybridization in Rice Bean [Vigna umbellata Thunb. (Ohwi and Ohashi)] in Mid Altitudes of Meghalaya. Journal of Agricultural Science 147, 581-588.

  11. Mohammady, S., Arminian, A., Khazaei, H., Kozak, M., (2009). Does water use efficiency explain the relationship between carbon isotope discrimination and wheat grain yield? Acta Agriculturae Scandinavica, Section B: Plant and Soil Science, 59, 385-388.

  12. Kozak, M. (2009). Analyzing one-way experiments: a piece of cake or a pain in the neck? Scientia Agricola, 66(4), 556-562.

  13. Kozak, M., Lewandowski, M. (2010). Eriophyoid mites (Acari: Eriophyoidea) on coniferous trees: is the occurrence of one species associated with the other? Experimental and Applied Acarology 50, 115-122.

  14. Singh, H.P., Kumar, S., Kozak, M. (2009). Improved estimation of finite-population mean using sub-sampling to deal with non-response in two-phase sampling scheme. Communications in Statistics: Theory and Methods 39, 791-802.

  15. Singh, S., Singh, H.P., Tailor, R., Allen, J., Kozak, M. (2009). Estimation of ratio of two finite-population means in the presence of non-response. Communications in Statistics: Theory and Methods 38(19), 3608-3621.

  16. Stępień, M., Kozak, M. (2009). Relationships among indicators of soil acidity. Acta Agriculturae Scandinavica B: Plant and Soil Science 59, 475-480.

  17. Kozak, M. (2008). Correlation coefficient and the fallacy of statistical hypothesis testing. Current Science, 95 (9), 1121-1122.

  18. Kozak, M., Bocianowski, J., Rybiński, W. (2008). Selection of promising genotypes based on path and cluster analyses. Journal of Agricultural Science, 146, 85-92.

  19. Kozak, M., Jankowski, P. (2008). Allocation constraints in stratification. Communications in Statistics: Simulation and Computation, 37(9), 1763-1775.

  20. Kozak, M., Scaman, C.H. (2008). Unsupervised classification methods in food sciences: discussion and perspectives. Journal of the Science of Food and Agriculture, 88, 115-1127.

  21. Kozak, M., Zieliński, A., Singh, S. (2008). Stratified two-stage sampling in domains: sample allocation between domains, strata, and sampling stages. Statistics and Probability Letters, 78(8), 970-974.

  22. Ledwoń, A., Szeleszczuk, P., Zwolska, Z., Augustynowicz-Kopec, E., Kozak, M. (2008). Occurrence of Mycobacterium in faeces of parrots kept in zoological gardens and private aviaries in Poland. Bulletin of the Veterinary Institute in Pulawy, 52(3), 341-346.

  23. Ledwoń, A., Szeleszczuk, P., Zwolska, Z., Augustynowicz-Kopeć, E., Sapierzyński, R., Kozak, M. (2008). Experimental infection of budgerigars (Melopsittacus undulatus, Shaw, 1805) with five Mycobacterium species. Avian Pathology, 37(1), 59-64.

  24. Lewandowski, M., Kozak, M. (2008). Distribution of eriophyoid mites (Acari: Eriophyoidea) on coniferous trees. Experimental and Applied Acarology, 44, 89-99.

  25. Samborski, S., Kozak, M., Azevedo, R.A. (2008). Does nitrogen uptake affect nitrogen uptake efficiency, or vice versa? Acta Physiologiae Plantarum, 30(4), 419-420.

  26. Singh, H.P., Singh, S., Kozak, M. (2008). A family of estimators of finite-population distribution function using auxiliary information. Acta Applicandae Mathematicae, 104 (2), 115-130.

  27. Kozak, M., Samborski, S., Rozbicki, J., Mądry, W. (2007). Winter triticale grain yield, a comparative study of 15 genotypes. Acta Agriculturae Scandinavica, Section B - Plant and Soil, 57, 263-270.

  28. Kozak, M., Singh, P.K., Verma, M.R., Hore, D.K. (2007). Causal mechanism for determination of grain yield and milling quality of lowland rice. Field Crops Research, 102, 178-184.

  29. Kozak, M., Zieliński, A. (2007). Comparison of efficiency of stratified and unequal probability sampling. Communications in Statistics: Simulation and Computation, 36(4), 807-816.

  30. Kozak, M. (2006). On sample allocation in multivariate surveys. Communications in Statistics: Simulation and Computation, 35(4), 901-910.

  31. Kozak, M., Gozdowski, D., Wyszyński, Z. (2006). An approach to analyzing a response variable as affected by its additive components: example for spring barley grain yield. Cereal Research Communications, 34(2-3), 981-988.

  32. Kozak, M., Mądry, W. (2006). Note on yield component analysis. Cereal Research Communications, 34(2-3), 933-940.

Other publications in international journals:

  1. Kozak, M. (xxxx). When should zero be included on a scale showing magnitude? Teaching Statistics (in press).

  2. Kozak, M. (2010). dotplots.errors, a new R function to ease the pain of creating dotplots. Communications in Biometry and Crop Science 5(2), 69-77.

  3. Kozak, M. (2010). Use of parallel coordinate plots in multi-response selection of interesting genotypes. Communications in Biometry and Crop Science 5(2), 83-95.

  4. Kozak, M., Krzanowski, W.J. (2010). Effective presentation of data. European Science Editing 36(2), 41-42.

  5. Kozak, M., Wang, H.Y. (2010). On stochastic optimization in sample allocation among strata. METRON (in press).

  6. Kozak, M. (2010). Note on two methods of additive yield component analysis. Biometrical Letters (in press).

  7. Kozak, M. (2010). Yet another visualization of the Iris data: the bridge plot . Model Assisted Statistics and applications (in press).

  8. Kozak, M., Bocianowski, J., Sawkojć, S., Wnuk, A. (2010). Call for more graphical elements in statistical teaching and consultancy. Biometrical Letters 47(1), 57-68.

  9. Kozak, M., Wnuk, A., Krzanowski, W.J. (2010). A simple R function for inspecting multivariate data. Communications in Biometry and Crop Science (in press).

  10. Shangodoyin D.H., Ojo J.F., Kozak M. (2010). Subsetting and identification of optimal models in one-dimensional bilinear time series modeling. International Journal of Management Science and Engineering Management (in press).

  11. Kozak, M. (2009). How to show that sample size matters. Teaching Statistics, 31(2), 52-54.

  12. Kozak, M. (2009). Text-table: an undervalued and underused tool for communicating information. European Science Editing 35(4), 103-105.

  13. Kozak, M. (2009). What is strong correlation? Teaching Statistics 31, 85-86.

  14. Kozak, M. (2009). Teaching statistics = Teaching thinking statistically. Model Assisted Statistics and Applications (zaakceptowane).

  15. Kozak, M., Bakinowska, E., Paderewski, J. (2009). Polish agricultural universities students’ graphical perception. Model Assisted Statistics and Applications (zaakceptowane).

  16. Kozak, M., Verma, M.R. (2009). Multiplicative yield component analysis: what does it offer to cereal agronomists and breeders? Plant, Soil and Environment, 55, 134-138.

  17. Arminian, A., Kang, M.S., Kozak, M., Houshmand, S., Mathews, P. (2008) MULTPATH: A Comprehensive MINITAB Program. Journal of Crop Improvement, 22(1), 82-120.

  18. Bocianowski, J., Łuczkiewicz, T., Kozak, M., Brzeskwiniewicz, H. (2008). Does genetic distance of parental forms affect specific combining ability and heterosis effects in F1 and F2 of spring rape diallel cross? Agriculturae Conspectus Scienticus, 73(4), 73(4), 1-5.

  19. Kozak, M. (2008). Correlation and regression: similar or different concepts? Statistics in Transition—new series, 9(1), 159-162.

  20. Kozak, M. (2008). Finite and infinite populations in biological statistics: Should we distinguish them? The Journal of American Science, 4(1), 59-62.

  21. Singh, G.N., Priyanka, K., Kozak, M. (2008). Use of imputation methods at current occasion in two-occasion rotation patters. Model Assisted Statistics and Applications, 3(2), 99-112.

  22. Kozak, M., Gozdowski, D., Wyszyński, Z. (2008). Does number of kernels per spike follow a normal distribution in spring barley? Seed Science and Biotechnology, 2(1), 37-41.

  23. Gozdowski, D., Kozak, M., Kang, M.S., Wyszyński, Z. (2007). Dependence of grain weight of spring barley genotypes on traits of individual stems. Journal of Crop Improvement, 21(1/2), 223-233.

  24. Kozak, M. (2007). Ontogenetic chain and the Markov condition in crop science. Nature and Science, 5(3), 5-8.

  25. Kozak, M., Kang, M.S. (2007). R: modern tool for scientific computing. Nature and Science, 5(2), 41-43.

  26. Kozak, M., Kang, M.S., Stępień, M. (2007). Causal pathways when independent variables are co-related: new interpretational possibilities. Plant, Soil and Environment, 53(6), 267-275.

  27. Kozak, M., Samborski, S., Kang, M.S., Rozbicki, J. (2007). Applying statistics for nonsequential yield component analysis. Plant, Soil and Environment, 53(10), 456-463.

  28. Kozak, M., Singh, S. (2007). Application of evolutionary algorithms in multivariate stratification. Journal of the Indian Society of Agricultural Statistics, 61(3), 355-360.

  29. Kozak, M., Verma, M.R., Zieliński, A. (2007). Modern approach to optimum stratification: Review and perspectives. Statistics in Transition, 8(2), 223-250.

  30. Kozak, M. (2006). Multivariate sample allocation: application of random search method. Statistics in Transition, 7 (4), 889-900.

  31. Kozak, M. (2006). Note on stratified two-stage sampling under precision constraints. Model Assisted Statistics and Applications, 1(3), 189-192.

  32. Kozak, M. (2006). Optimal number of strata in agricultural surveys. Statistics in Transition, 7 (5), 971-979.

  33. Kozak, M. (2006). Two-dimensional partitioning of yield variation: A critical note. Plant Breeding and Seed Science, 53, 37-42.

  34. Kozak, M., Gozdowski, G., Hossain, S., Ahmed, S.E., Laudański, Z., Wyszyński, Z. (2006). Canonical correlations in studying grain yield and protein content as affected by yield components: An ontogenetic approach. Plant Breeding and Seed Science, 54, 17-27.

  35. Kozak, M., Kang, M.S. (2006). Note on modern path analysis in application to crop science. Communications in Biometry and Crop Science, 1 (1), 32-34.

  36. Kozak, M., Paderewski, J., Zieliński, A. (2006). Numerical problems connected with accuracy of variance estimation. Model Assisted Statistics and Applications, 1(2), 101-105.

  37. Kozak, M., Verma, M.R. (2006). Geometric versus optimization approach to stratification: comparison of efficiency. Survey Methodology, 32(2),  157-163.

  38. Kozak, M. (2005). On stratified two-stage sampling: Optimum stratification and sample allocation between strata and sampling stages. Model Assisted Statistics and Applications, 1, 23-29.

  39. Kozak, M., Stępień, M., Joarder, A.H. (2005). Relationships between available and exchangeable potassium content and other soil properties. Polish Journal of Soil Science, Vol. XXXVIII (2), 179-186.

  40. Kozak, M., Wieczorkowski, R. (2005). ΠPS sampling versus stratified sampling – Comparison of efficiency in agricultural surveys. Statistics in Transition, 7(1), 5-12.

  41. Kozak M., Zieliński A. (2005). Sample allocation between domains and strata. International Journal of Applied Mathematics & Statistics, 3, 19-40.

  42. Mądry, W., Kozak, M., Pluta, S., Żurawicz, E. (2005). A new approach to sequential yield component analysis (SYCA): Application to fruit yield in blackcurrant (Ribes nigrum L.). Journal of New Seeds, 7 (1), 85-107.

  43. Kozak, M. (2004). Multivariate sample allocation problem in two schemes of two-stage sampling. Statistics in Transition, 6 (7), 1047-1054.

  44. Kozak, M. (2004). New concept of yield components analysis. Biometrical Letters, 41 (2), 59-69.

  45. Kozak, M. (2004). Optimal stratification using random search method in agricultural surveys. Statistics in Transition, 6 (5), 797-806.

Publications in local journals

  1. Kozak, M., Wnuk, A., Gozdowski, D., Wyszyński, W. (2010). Visualizing bivariate relationships with hexagonally binned data. Colloquium Biometricum 40, 31-40.

  2. Wnuk A., Kozak M., Rochalska M. (2009). Mosaic plots help visualize contingency tables. Example for a questionnaire survey on knowledge of and attitude towards GMO. Colloquium Biometricum 39, 137-146.

  3. Pluta, S., Mądry, W., Żurawicz, E., Kozak, M. (2008). Analiza statystyczna zależności plonu owoców porzeczki czarnej (Ribes nigrum L.) od dwóch składowych multiplikatywnych. Biuletyn IHAR, 249, 241-249.

  4. Samborski, S., Kozak, M., Rozbicki, J. (2006). The usefulness of chlorophyll meter SPAD-502 for winter triticale grain yield estimation. Folia Universitas Agriculturae Stetinensis, Agricultura, 247 (100), 157-162.

  5. Kozak, M., Mądry, W. (2005). Metody statystyczne analizy składowych plonu. Postępy Nauk Rolniczych, 1, 33-45.

  6. Kozak, M., Mądry, W. (2005). Pierwotne cechy rozwojowe w analizie składowych plonu. Część I. Opis metody. Fragmenta Agronomica, 4, 71-83.

  7. Kozak, M., Stępień, M. (2005). Application of path analysis to assess affecting spring triticale grain yield by soil properties in acid soil environment. Colloquium Biometryczne, 35, 187-196.

  8. Samborski, S., Kozak, M., Mądry, W., Rozbicki, J. (2005). Pierwotne cechy rozwojowe w analizie składowych plonu. Część II. Zastosowanie dla plonu ziarna pszenżyta ozimego. Fragmenta Agronomica, 4, 84-97.

  9. Kozak M. (2004). Alokacja próby między warstwy w przypadku cechy wielowymiarowej. Wiadomości Statystyczne, 7, 13-21.

  10. Kozak, M. (2004). Efektywność schematów losowania w badaniach gospodarstw rolnych. Wiadomości Statystyczne, 9, 20-26.

  11. Kozak, M. (2004). Method of multivariate sample allocation in agricultural surveys. Colloquium Biometryczne, 34, 241-250.

  12. Kozak, M. (2004). Modyfikacja metody Daleniusa i Hodgesa wyznaczania przybliżonych granic warstw. Wiadomości Statystyczne, 10, 10-16.

  13. Kozak, M. (2004). Nowe podejście do warstwowania wielowymiarowej populacji. Wiadomości Statystyczne, 12, 12-20.

  14. Kozak, M. (2004). Optymalna stratyfikacja populacji z wykorzystaniem cechy dodatkowej. Wiadomości Statystyczne, 8, 29-34.

  15. Kozak, M. (2004). Przydatność modelu liniowego w analizie składowych plonu. Colloquium Biometryczne, 34, 117-126.

  16. Kozak, M., Laudański, Z., Zieliński, A. (2004). Biometrical computing with R. Colloquium Biometryczne, 34b, 51-64.

  17. Kozak, M., Mądry, W. (2004). Statystyczna analiza multiplikatywnych składowych plonu roślin – podstawy modelowania. Postępy Nauk Rolniczych, 5, 13-25.

  18. Mądry, W., Kozak, M., Pluta, S., Żurawicz, E. (2003). Zastosowanie sekwencyjnej analizy plonu w badaniach nad uwarunkowaniem zmienności plonu owoców porzeczki czarnej (Ribes nigrum L.) na roślinie przez cechy plonotwórcze. Biuletyn IHAR, 226/227, 31-40.

  19. Mądry, W., Laudański, Z., Kozak, M., Rozbicki, J. (2003). Empiryczne porównanie sekwencyjnej analizy składowych plonu i analizy ścieżek pojedynczych dla plonu ziarna pszenżyta ozimego i jego składowych. Biuletyn IHAR, 230, 147-156.

  20. Kozak, M., Mądry, W., Wyszyński, Z. (2002). Metoda analizy wpływu masy korzeni z różnych frakcji na plon korzeni buraka cukrowego. Fragmenta Agronomica, 2 (74), 251-262.

  21. Mądry, W., Kozak, M. (2000). Analiza ścieżek i sekwencyjna analiza plonu w badaniach zależności plonu od cech łanu. Cz. I. Opis metod. Roczniki Nauk Rolniczych, Seria A, 115, 143-157.

  22. Mądry, W., Kozak, M., Rozbicki, J. (2000). Analiza ścieżek i sekwencyjna analiza plonu w badaniach zależności plonu od cech łanu. Cz. II. Zastosowanie metod i porównanie wyników dla pszenżyta ozimego. Roczniki Nauk Rolniczych, Seria A, 115, 159-172.

Scientific correspondence

  1. Kozak, M. (2009). Impact factor does not have to monopolize scientific journals ranking. Current Science, 96 (5), 634.

  2. Kozak, M. (2007). Peer review of manuscripts. Current Science, 94 (2), 426.

  3. Kozak, M. (xxxx). Asterisks – friends or foes of statistics? Teaching Statistics (in press).

  4. Kozak, M. (2009). Commentary: Imagipulate or perish? European Science Editing, 35(2), 39-40.

  5. Kozak, M. (2009). The author thanks the anonymous referees for their valuable comments. European Science Editing, 35(1), 102.

  6. Kozak, M. (2008). On journals' copyediting. Current Science, 94 (8), 963.

  7. Kozak, M. (2008). A call from a non-native speaker: don’t look at my affiliation. European Science Editing, 34(4), 100; with discussion on pages 100-104 and subsequent issues.

  8. Kozak, M. (2008). Agriculture is a very important aspect of the economy. European Science Editing, 34(3), 70.

  9. Kozak, M. (2008). How to reject a statistical paper. European Science Editing, 34(2), 40-41.

  10. Kozak, M. (2007). 'No-charge' journals: A choice for low-quality science? Current Science, 93 (11), 1470.

  11. Kozak, M. (2007). Good scientific writing. Current Science, 92 (12), 1659.

  12. Kozak, M. (2007). Science in public media. Current Science, 93(3), 277.

  13. Kozak, M. (2007). Save Rospuda Valley. Current Science, 93(1), 6.

  14. Kozak, M. (2007). Impact of Indian journals on science. Current Science, 92(12), 1661.

  15. Kozak, M. (2007). To see beyond the horizon: Structural Equation Modeling. Nature and Science, 5 (2), 44.

  16. Kozak, M. (2007). Alice, mustard, and ornamental writing. European Science Editing, 34(3), 82.

  17. Kozak, M. (2007). Blinded review systems. European Science Editing, 33(2), 56.


  1. Kozak, M., Lesser, L. (2010) Teaching Statistics: Announcing a new section of Model Assisted Statistics and Applications. Model Assisted Statistics and Applications, 5 (in press).

  2. Kozak, M. (2008). Editorial: Let’s sing a song about statistical models. Model Assisted Statistics and Applications, 3(1), 1.

  3. Kozak, M. (2008). Guest Editorial: Who are you, Editor? European Science Editing 34(1), 3.

  4. Kozak, M. (2007). Editorial. Model Assisted Statistics and Applications, 2(1), 1.

  5. Kang, M.S., Kozak, M., Prasad, V.V.P. (2006). Editorial. Communications in Biometry and Crop Science, 1(1), I-II.

Book reviews

  1. Kozak, M. (2006). Quinn, G.P., and Keough, M.J. „Experimental Design and Data Analysis for Biologists”—book review. Communications in Biometry and Crop Science, 1, 139-141.

  2. Kozak, M. (2006). Sarjinder Singh, „Thinking Statistically: Elephants go to school”—book review. Statistics in Transition, 7(6), 1407-1409.

Conference proceedings

  1. Kozak, M. (2001). Use of two-dimensional partitioning of yield variation for winter triticale. 3rd International Conference of PhD Students, University of Miskolc, 183-189.

  2. Wyszyński, Z., Kalinowska-Zdun, M., Kozak, M., Gozdowski, D. (2000). Vynosotvorne prvky a jejich vliv na vynosy cukrovky z zavislosti na nekterych agrotechnickych opatrenich. Proc. of 10th International Conference "Problems of Crop Production 2000", 202-208, Praga 2000.

Professional Affiliations:

Progamming skills: