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Mother weight vs Offspring weight 2005 to 2010 GPC

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1/20/2011 1/20/2011 9:32:23 PM http://www.bigpumpkins.com/MsgBoard/ViewThread.asp?b=19&p=377628 2393

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1658 x 1622 x 2

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Tea Brewer

Tea Brewer

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I looked at all the GPC data available, going back to 2005, and used just those entries that had the mother seed wt recorded along with the offspring wt. Then doing a simple linear regression, I looked at the relationship between the two. There is actually a statistically significant relationship. Here's the resulting equation: Offspring_weight = 483 + (Mother_seed_weight x 0.304) Here's a table with the expected average results for a range of mother wts. mother_wt------Average_offspring_wt 200---------------543.8 400---------------604.6 600---------------665.4 800---------------726.2 1000--------------787 1200--------------847.8 1400--------------908.6 1600--------------969.4 It's noisy, of course, but explains about 8.5% of the variation (r^2=0.085). If we assume the standard deviation is constant across the range of mother weights than larger mother weights would, on average, have a higher probability of growing that 2000 lb offspring. I looked at individual years' data and they all show pretty much the same trend as all years combined.


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