This data is not audited, and has not been reviewed, approved, or otherwise checked in any way by NAPHA. It is provided for informational purposes only.
Data is NAPHA registered horses in online studbook with a known foal date through 2004.
Statistics produced by Windows Excel Discriptive Statistics Add-On.
| Registered US Foals by Year Born | Reg'd Imported Horses by Year Born | |||
| 1961 - 2004 | 1953 - 2004 | |||
| Mean | 385.5227273 | Mean | 20.63461538 | |
| Standard Error | 43.48350868 | Standard Error | 1.609274788 | |
| Median | 381.5 | Median | 23 | |
| Mode | 1 | Mode | 1 | |
| Standard Deviation | 288.4369657 | Standard Deviation | 11.60464553 | |
| Sample Variance | 83195.88319 | Sample Variance | 134.6677979 | |
| Kurtosis | -1.590494671 | Kurtosis | -0.828112501 | |
| Skewness | -0.018127673 | Skewness | -0.212093909 | |
| Range | 798 | Range | 43 | |
| Minimum | 1 | Minimum | 1 | |
| Maximum | 799 | Maximum | 44 | |
| Sum | 16963 | Sum | 1073 | |
| Count | 44 | Count | 52 | |
| Confidence Level(95.0%) | 87.69285163 | Confidence Level(95.0%) | 3.230753879 | |
| All Registered Horses by Year Born | ||||
| 1953 - 2004 | ||||
| Mean | 346.8461538 | |||
| Standard Error | 41.48344074 | |||
| Median | 309.5 | |||
| Mode | 1 | |||
| Standard Deviation | 299.1413453 | |||
| Sample Variance | 89485.54449 | |||
| Kurtosis | -1.563350425 | |||
| Skewness | 0.260056466 | |||
| Range | 828 | |||
| Minimum | 1 | |||
| Maximum | 829 | |||
| Sum | 18036 | |||
| Count | 52 | |||
| Confidence Level(95.0%) | 83.28148062 | |||
Data analysis performed by Stevi Deter on 11-Oct-2005. Feel free to contact me directly with any questions.
Unless otherwise noted, the data source is all horses with a record in the NAPHA online studbook (http://www.pphrnastudbook.com/). Data set includes up to 9/15/2005 update to online studbook.
Horses in the online studbook with registration numbers below 1000 are not registered with NAPHA, but are included as parents of registered horses. Unless otherwise noted, statistics include these reference horses. "Registered horse" data set refers only to those horses with registration numbers above 1000. "All horses" includes reference horses (all horses with a record in the online studbook).