I want to obtain the pearson correlation of "experienced disfluency" and "narrative engagement" from the attached unstandardized coefficients for my meta-analysis. The paper is from Walter, N., Bilandzic, H., Schwarz, N., & Brooks, J. J. (2021). Metacognitive approach to narrative persuasion: The desirable and undesirable consequences of narrative disfluency. Media Psychology, 24(5), 713-739.
Given that the R square is listed as .23 and the regression coefficient is in negative sign (-.34). The pearson correlation would then be -.48 (.48 is the square root of R square .23). Correct?
Also, to double check, the calculation of disfluency in this paper actually use the reverse code of fluency scale. And since my meta-analysis is about the relationship between narrative engagement and fluency (not disfluency). The ultimate pearson correlation I should go with should be .48. Am I on the right track?
Many thanks for the help.