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What's wrong with chasing numbers?
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<blockquote data-quote="bigag03" data-source="post: 771709" data-attributes="member: 9247"><p>The math behind the calculation is called BLUP (Best Linear Unbiased Prediction). It is a series of matrices that combine individual performance, parent performance, full and half sib performance, and most importantly, progeny performance. It is a weighted calculation where obviously, progeny data is the most heavily weighted. The larger the database is behind the data, the stronger the math is and the more reliable the predictions are (this is why Angus EPDs are the most reliable...there is more data).</p><p></p><p>The common misconception with EPD's is that they represent some given value (1.0 BW = 75 lbs)...NOT TRUE. The truth is that they only express the average of calves compared to the average of some other bull's calves. A set of EPD's by themselves mean nothing...they have to be compared to something (e.g. another bull or breed average). As the accuracy of an EPD increases, the variability in production never changes, but we become more confident in how that bull's average compares to others.</p></blockquote><p></p>
[QUOTE="bigag03, post: 771709, member: 9247"] The math behind the calculation is called BLUP (Best Linear Unbiased Prediction). It is a series of matrices that combine individual performance, parent performance, full and half sib performance, and most importantly, progeny performance. It is a weighted calculation where obviously, progeny data is the most heavily weighted. The larger the database is behind the data, the stronger the math is and the more reliable the predictions are (this is why Angus EPDs are the most reliable...there is more data). The common misconception with EPD's is that they represent some given value (1.0 BW = 75 lbs)...NOT TRUE. The truth is that they only express the average of calves compared to the average of some other bull's calves. A set of EPD's by themselves mean nothing...they have to be compared to something (e.g. another bull or breed average). As the accuracy of an EPD increases, the variability in production never changes, but we become more confident in how that bull's average compares to others. [/QUOTE]
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