例句與用法

1. test method of pipeline steels for resistance to step wise cracking
   管線鋼抗階梯型破裂試驗方法
2. evidence suggests that the prognostic ability of the new model with high stability, when hidden nodes changing nearby input nodes and training times changing at the certain extent, is significantly better than traditional step wise regression model mainly due to the new model condensing the more forecasting information, properly utilizing the ability of ann self-adaptive learning and nonlinear mapping . but the linear regression technique only selects several predictors by the f value, many predictors information with high relative coefficients is not included . so the new model proposed in this paper is effective and is of a very good prospect in the atmospheric sciences fields
   進一步深入分析研究發(fā)現(xiàn)，本文提出的這種基于主成分的神經(jīng)網(wǎng)絡預報模型，預報精度明顯高于傳統(tǒng)的逐步回歸方法，其主要原因是這種新的預報模型集中了眾多預報因子的預報信息，并有效地利用了人工神經(jīng)網(wǎng)絡方法的自組織和自適應的非線性映射能力；而傳統(tǒng)的逐步回歸方法是一種線性方法，并且逐步回歸方法只是根據(jù)f值大小從眾多預報因子中選取幾個預報因子，其余預報因子的預報信息被舍棄。
3. the main contents are as follows : 1 ) 3 eliminate error criterion method and step wise regression analysis method is used to analyze the errors of observation date . in the stepwise regression analysis, aging, loading and temperature which bulkily affects the dam's vertical deformation are selected as the regression factors, then regression equation and curve of each point are worked out
   運用3準則剔除誤差法和逐步回歸分析法對茅坪壩的觀測資料進行誤差分析，在逐步回歸分析中，選用對壩體豎向變形影響較大的時效、施工加載和溫度作為回歸因子，求出各測點的回歸方程和擬合曲線。
4. (1 ) ptfs have been developed by using multivariate step wise regression analysis, nonlinear analysis and principle factor analysis . ( 2 ) back-propagation neural network ( bp ) was used in simulation and prediction of ptfs . we use theory of difference to evaluate ptfs developed whether regression method or bp model
   不論是采用統(tǒng)計回歸模擬模型，還是采用bp神經(jīng)網(wǎng)絡技術所建立的土壤傳遞函數(shù)(ptfs)，我們均用誤差分析理論分析評價了兩函數(shù)模型的有效性、適用性和精度，其精度通過均方差來衡量。