Klotz

07-19-2009, 07:32 PM

At another forum we have a thread where everyone keeps track of their three powerlifting lifts, and there's a leaderboard to see who's strongest. Anyway, I took the data and analysed it, made some graphs and did some analysis.

We have about 100 men. A small minority might be using equipment, I'm not sure whom.

http://ztolk.interestingnonetheless.net/deadVsquat.PNG

http://ztolk.interestingnonetheless.net/benchVsquat.PNG

http://ztolk.interestingnonetheless.net/deadVbench.PNG

I'm no statistician, but I did a linear fit of the big three lifts against each other. They all have moderate correlation (the closer R^2 is to 1, the tighter), with bench and squat being the most closely correlated. One interesting trend is that the slope of deadlift vs squat is less than 1, meaning that as the people get stronger in the squat, their deadlift gets closer to their squat. According to the fit, the two would be equal at 718 lb.

Another thing that these show is that it's unrealistic to talk about pure ratios between lifts; there are offsets as well, and the ratios change if these are ignored.

http://ztolk.interestingnonetheless.net/totalVweight.PNG

This is a graph of PL total and Wilks versus bodyweight. Wilks is more or less constant with weight, which is expected and desired; there's a slight positive correlation. Total increases with weight, but the (linear) correlation isn't very tight.

http://ztolk.interestingnonetheless.net/wilksVtotal.PNG

This shows Wilks coefficient vs total. There is a pretty strong correlation.

Anyway, that's what I've done for now. If there are any other statistics people want (like individual lifts vs weight), let me know. I hope you find this interesting.

We have about 100 men. A small minority might be using equipment, I'm not sure whom.

http://ztolk.interestingnonetheless.net/deadVsquat.PNG

http://ztolk.interestingnonetheless.net/benchVsquat.PNG

http://ztolk.interestingnonetheless.net/deadVbench.PNG

I'm no statistician, but I did a linear fit of the big three lifts against each other. They all have moderate correlation (the closer R^2 is to 1, the tighter), with bench and squat being the most closely correlated. One interesting trend is that the slope of deadlift vs squat is less than 1, meaning that as the people get stronger in the squat, their deadlift gets closer to their squat. According to the fit, the two would be equal at 718 lb.

Another thing that these show is that it's unrealistic to talk about pure ratios between lifts; there are offsets as well, and the ratios change if these are ignored.

http://ztolk.interestingnonetheless.net/totalVweight.PNG

This is a graph of PL total and Wilks versus bodyweight. Wilks is more or less constant with weight, which is expected and desired; there's a slight positive correlation. Total increases with weight, but the (linear) correlation isn't very tight.

http://ztolk.interestingnonetheless.net/wilksVtotal.PNG

This shows Wilks coefficient vs total. There is a pretty strong correlation.

Anyway, that's what I've done for now. If there are any other statistics people want (like individual lifts vs weight), let me know. I hope you find this interesting.