Standard deviations of differences between estimated and actual yields are shown in Table 3. The standard deviations of differences between either BP method and both measures of actual yield were smaller than for differences between TIM and actual yield for all testing environments. For comparisons of estimated yield with 305-d actual yield, standard deviations of differences for both BP methods were 4%smaller than for TIM for MN testing, 6% smaller for AP testing, and 10% smaller for TRI testing, which indicates that both BP methods have a modrate advantage over TIM despite correlations between TIM and BP estimates of nearly 1.0. The advantage increased for testing environments in which weights and samples were recorded at less optimal intervals and frequencies. The main advantage of a BP method over TIM is that lactation records are regressed
Comparison of Test Interval and Best Prediction Methods for Estimation of Lactation Yield from Monthly, a.m.–p.m., and Trimonthly Testing (PDF Download Available). Available from: https://www.researchgate.net/publication/13221765_Comparison_of_Test_Interval_and_Best_Prediction_Methods_for_Estimation_of_Lactation_Yield_from_Monthly_am-pm_and_Trimonthly_Testing [accessed May 8, 2016].