A recent article in the Journal of Marketing (vol. 72) by Krasnikov et. al. finds a stronger correlation between marketing capabilities and firm performance (r = .35) than those for both R&D (r = .28) and operations (r = .21). The managerial implication is that “increase in marketing capability is associated with stronger improvement in firm performance than increases in operations capability and R&D capability (Hanssens, D, ed., 2009, Empirical Generalizations about Marketing Impact, p. 3).
Check out the article: Relative Impact of Marketing on Firm Performance
About Correlation (r)
Correlation is a statistical measurement that determines the “goodness of fit” of a relationship between two variables. It does not determine cause. Correlation is measured on a scale from 1 to -1. The closer the “r” score is to 1, the more positive the correlation is between the two variables. The closer the “r” score is to -1, the more negative the correlation is between the two variables. The closer the “r” score is to zero, the less correlation exists between the two variables.