Fact · Typing and writing speed
0.73correlation coefficient (r)
Across the study's typists, the share of keystrokes typed with rollover correlated highly with typing performance, r = 0.73.
Checked against its source on October 16, 2026
In the source's own words
“Rollover ratio is found to have a high correlation with performance (r = 0.73, p < 0.001).”
Observations on Typing from 136 Million Keystrokes, Vivek Dhakal et al., CHI 2018, ACM Conference on Human Factors in Computing Systems, 2018, Results.
Open the original (DOI 10.1145/3173574.3174220)- What it measures
- A correlation of 0.73 means the two measures move together strongly. The rollover ratio is the percentage of keystrokes typed with rollover.
- What it does not show
- A correlation shows association, not cause. The paper does not show how much a typist would gain by learning rollover.