This is fascinating man. But, I've got a possibly dumb question (considering my formal science training ended in high school!). You mentioned 128 kph as the lower bound because the science changes below that number. I was wondering how you determined 128? Is it a number where you saw inexplicable changes within these formulas, or was it just a gut feel number?
I ask because I've been thinking about the upcoming Women's World Cup in England, where "express" pace is in the 120+ kph range. I was wondering what we can expect on these pitches at that pace, especially considering that England seems to be this interesting outlier nation in your 128+ kph data?
Haha the 128 is just a very rough number to filter out slower balls. On average 125-128 is the slower ball barrier for men pacers.
The good level shifts a meter fuller for women's pacers but the basic character outlined here remains the same. Slower balls are different because they have different revolutions on the ball, often with sidespin or overspin instead of the backspin that's on seam up balls. A seam on delivery from a woman pacer will behave the same way, just with different values. That's what I think, haven't checked it.
Ah okay, so you're saying slower balls in the Men's game are usually some kind of variation and that variation is what changes the graph - not the speed? So when the women are going all out at 125, its just about adjusting the "good" length range to see similar bounce effects?
Interesting analysis - I'd imagine Australia's pitches are in the SA WI cluster, I didn't see them in any of the graphs. You mentioned spin having different surface physics, and I can see how comparing topspinner, leg/off break, and flipper would be inconvenient for using this COR method for all spin deliveries - would it be better to compare the charts for spin deliveries if the delivery type is known? I'm curious to see how spin deliveries interact with the pitches compared to pace.
Also, sir, hats off to your ball-by-ball dataset! Discovered it a few days ago, and I can't stop playing around with it! :)
Thanks! I don't have Aus data so I didn't show Aus.
For spin, it's an entirely different kettle of fish since the ball is spinning forward and sideways -- this imparts a significant sideways impulse on the ball when it pitches.
Can it be that the pitches that are from the pace freindly countries have more bounce. Bowlers in order to target the the stumps or just above it bowl fuller which gives the bowl more time with V0 which is greater than V1 making it faster as a whole.
This is fascinating man. But, I've got a possibly dumb question (considering my formal science training ended in high school!). You mentioned 128 kph as the lower bound because the science changes below that number. I was wondering how you determined 128? Is it a number where you saw inexplicable changes within these formulas, or was it just a gut feel number?
I ask because I've been thinking about the upcoming Women's World Cup in England, where "express" pace is in the 120+ kph range. I was wondering what we can expect on these pitches at that pace, especially considering that England seems to be this interesting outlier nation in your 128+ kph data?
Haha the 128 is just a very rough number to filter out slower balls. On average 125-128 is the slower ball barrier for men pacers.
The good level shifts a meter fuller for women's pacers but the basic character outlined here remains the same. Slower balls are different because they have different revolutions on the ball, often with sidespin or overspin instead of the backspin that's on seam up balls. A seam on delivery from a woman pacer will behave the same way, just with different values. That's what I think, haven't checked it.
Ah okay, so you're saying slower balls in the Men's game are usually some kind of variation and that variation is what changes the graph - not the speed? So when the women are going all out at 125, its just about adjusting the "good" length range to see similar bounce effects?
yes, I think it will work that way
Interesting analysis - I'd imagine Australia's pitches are in the SA WI cluster, I didn't see them in any of the graphs. You mentioned spin having different surface physics, and I can see how comparing topspinner, leg/off break, and flipper would be inconvenient for using this COR method for all spin deliveries - would it be better to compare the charts for spin deliveries if the delivery type is known? I'm curious to see how spin deliveries interact with the pitches compared to pace.
Also, sir, hats off to your ball-by-ball dataset! Discovered it a few days ago, and I can't stop playing around with it! :)
Thanks! I don't have Aus data so I didn't show Aus.
For spin, it's an entirely different kettle of fish since the ball is spinning forward and sideways -- this imparts a significant sideways impulse on the ball when it pitches.
Can it be that the pitches that are from the pace freindly countries have more bounce. Bowlers in order to target the the stumps or just above it bowl fuller which gives the bowl more time with V0 which is greater than V1 making it faster as a whole.