“5 Times Better”
There are two methods that statisticians use to evaluate the reliability of E-Targets. The published report used the Radial Error as it’s main criteria.Rattlesnake Test
The Radial method measures from the XY coordinates to center.
The other method uses Gross Error. That measures the Actual vrs the Reported XY coordinates.
THE QUESTION IS:
DOES MY E-TARGET QUALIFY FOR NRA MATCHES 2020?
Download the 1 page summary of all statistics below. Click on.Better Buy
RADIAL ERROR reporting STANDARD DEVIATION
|Yardage||HEXTA SD||SOLO SD||HEXTA Better by|
RADIAL ERROR AVERAGE
|Yardage||HEXTA||SOLO||HEXTA better by|
Shots Passing NRA .25" Rule
The method which is employed in the report calculates the error between the ET reported shot position and the measured paper position (see picture) as 0 (zero), while the actual error is 3.2 feet. If this method were to be adopted by the NRA for approval, then any target system with such errors would be approved for competition which is obviously not acceptable.
Another system used by the teams in Australia and which Hex Systems is based on Gross Error. That evaluates the Actual X&Y coordinates vrs the Reported X&Y coordinates.
The following tables are supplemental to the USA report.
GROSS ERROR Analysis
|Yardage||HEXTA %||SOLO %||HEXTA BETTER X Times||HEXTA Max Err. Inch||SOLO Max Error||HEXTA Better by|
|600||94.4% (34 of 36)||33% (12 of 36)||2.8 Times||0.266||1.189||4.47 Times|
|800||95.0% (19 of 20)||20% (4 of 20)||4.75 Times||0.338||7.52.919||8.64 Times|
|1000||88% (22 of 25)||4% (1 of 25)||22 Times||0.444||1.972||4.44 Times|
Here is the FOUNDATIONAL HEART of ALL E-Targets!
The acoustic center must remain stationary at all times after CALIBRATION!
Because it is almost impossible to superimpose the aiming mark center over the acoustic center to 0.1 mm, so the math calculates the OFFSET. The table below demonstrates the OFFSET movement in the Rattlesnake test.
|Yardage||HEXTA X||HEXTA Y||SOLO X||SOLO Y|