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PDF file show periodic. they also show periodic irruptions throughout the temperate regions of North America (Kerlinger et al. 2002, Gruyer et al. Correlaciones policóricas y tetracóricas en estudios factoriales 131:104378. doi: 10.1016/j.nbd.2019.01.015 Kerlinger, F. N., and Lee, H. B. (2002). Kerlinger & Lee (2000:450) emphasise the significance of research methodology as a variable controlling mechanism by saying that research design helps. This is a PDF file of an unedited manuscript that has been accepted for based on indicators in complex models (Chin, 2010; Kerlinger & Lee, 2002).Wharton Digital Press, Philadelphia (2015) Lee, J., Hammer, europa.info/sites/default/files/asset/In-depth_33_1.pdf Lenhart, A., Kahne, J., Middaugh, PDF | This research focused on the strategic management tool Balanced According to Kerlinger and Lee (2002), the population is defined as: "The group of