Velocity change with seating depth?

[CharlieNC]

The standard deviation of the noise ( difference between the actual vs calculated results ) is sd = 4.5, which is typical for sd of individual velocity measurements. The probability that this is not a statistically relevant correlation is .001. In this example the signal due to jump overwhelmed the noise associated with the small sample size.

Regression Analysis: Velocity versus Jump

The regression equation is
Velocity = 3298 - 787 Jump


Predictor Coef SE Coef T P
Constant 3298.17 3.29 1001.28 0.000
Jump -786.8 137.9 -5.70 0.001


S = 4.52606 R-Sq = 84.4% R-Sq(adj) = 81.8%


Analysis of Variance

Source DF SS MS F P
Regression 1 666.59 666.59 32.54 0.001
Residual Error 6 122.91 20.49
Total 7 789.50


Unusual Observations

Obs Jump Velocity Fit SE Fit Residual St Resid
7 0.0330 3263.00 3272.21 2.31 -9.21 -2.37R

R denotes an observation with a large standardized residual.

No evidence of lack of fit (P >= 0.1).

 

[Ned Ludd]

The standard deviation of the noise ( difference between the actual vs calculated results ) is sd = 4.5, which is typical for sd of individual velocity measurements. The probability that this is not a statistically relevant correlation is .001. In this example the signal due to jump overwhelmed the noise associated with the small sample size.

Regression Analysis: Velocity versus Jump

The regression equation is
Velocity = 3298 - 787 Jump


Predictor Coef SE Coef T P
Constant 3298.17 3.29 1001.28 0.000
Jump -786.8 137.9 -5.70 0.001


S = 4.52606 R-Sq = 84.4% R-Sq(adj) = 81.8%


Analysis of Variance

Source DF SS MS F P
Regression 1 666.59 666.59 32.54 0.001
Residual Error 6 122.91 20.49
Total 7 789.50


Unusual Observations

Obs Jump Velocity Fit SE Fit Residual St Resid
7 0.0330 3263.00 3272.21 2.31 -9.21 -2.37R

R denotes an observation with a large standardized residual.

No evidence of lack of fit (P >= 0.1).

I misinterpreted what the OP was actually asking. ^^^This is the correct answer!

 

[JFrank]

Since you like to play with numbers, here's a range report from a couple of weeks ago when I was doing some seat depth testing with my new 284. I still have my LabRadar file on all the shots if you want to play with it. In college I hated statistics, so I don't mess with the raw LabRadar data. The target pictures are from a Shot Marker.

The W23... numbers refer to the Wilson seating die marks and therefore changes in seating depth.

My experience with changes in velocity from seating depth is that as you move away from the lands the initial start pressure decreases up to a point, at some point, as you go deeper into the case and the volume is reduced the velocity starts to climb up again. YMMV.

Joe



View attachment 1135400

What depth did you settle on ?