摘要
Inthisstudy,thesampledatawasbasedon2790samplesof9treesfromdahurianlarch（Larixgmelinii）plantationslocatedinQitaiheForestBureauinHeilongjiangProvince.ThemodifiedLogisticmodely=b1/[1+exp（b2x）]+b3wasselectedtomodelingmicrofibrilanglefromsixmodelsbasedonnonlinearregression.Then,thelogisticmodelwasfittedusingnonlinearmixed-effectmodelingapproachbasedonNLMEofS-PLUSsoftware.Evaluationstatistics,suchasAIC,BIC,LogLikelihoodandLikelihoodratiotestwereusedformodelcomparisons.TheresultsshowedthattheLogisticmodelwithparametersb1,b2,b3asmixedeffectsshowedthebestperformance.Correlationstructuresincludedcompound-symmetrystructure（CS）,first-orderautoregressivecorrelationstructureAR（1）,movingaveragecorrelationstructureMA（1）andautoregressive-movingaveragecorrelationstructure[ARMA（1,1）]wereincorpratedintothebestmicrofibrilanglemixedmodel.[ARMA（1,1）]significantlyimprovedtheprecisionofmixedmodel.Validationconfirmedthatthemixedmodelwithcalibrationofrandomparameterscouldprovidemoreaccurateandpreciseprediction.Therefore,theapplicationofmixedmodelnotonlyshowedthemeantrendsofmicrofibrilangle,butalsoshowedtheindividualdifferencebasedonvariance-covariancestructureandcorrelationstructure.
出版日期
2012年03月13日（中国期刊网平台首次上网日期，不代表论文的发表时间）
