查询词典 root mean square error

Coefficient of determination and root-mean-square error were used as criteria for best model.

结果表明，反射率倒数的对数lg(1/R)是估算土壤重金属元素含量最好的光谱指标，尤其是Cd和Pb，检验精度R超过0.82。

Techinque such as coefficient of determination, parameter hypothesis testing of models,root mean square error .

整理并修正各种近红外分析模型的精度评价标准、方法，包括评价模型拟合度的决定系数，回归参数的假设检验；检测模型预测精度的均方根误差及残差分析。

The Root Mean Square Error is used to assess these simulations.

以得推导出新的风速机率密度函数。

Root mean square error of prediction for gensenosides and transparency were 0.96 mg/mL, 1.13%.

总皂苷和透光率的预测均方差分别是0.96mg/mL、1.13%。

A more implementable measure is the Root Mean Square error between the original image and the image that has been compressed.

更有效的度量方法则是原始图像与压缩图像之间的均方根差。

In one embodiment, the parameter estimate is an estimate of time of arrival of the signal, and the reliability metric is root mean square error of the time of arrival estimate.

在一实施例中，参数估计是信号的到达时间的估计，可靠性度量是到达时间估计的均方根误差。

Results of this research show that the Averaged Root Mean Square Error of position and velocity with the filters was found to be larger (about 87% and 76%) than with the data fusion.

模拟结果显示，在位置部份，资料融合较滤波改善了约87%；在速度部份，资料融合较滤波改善了约76%。

The root mean square error for regressed rainfall is around 65﹪ of the standard deviation and about 15﹪ of the mean rainfall.

回归的平方根误差是其标准差的60％和平均雨量的15％。

Density Functional Theory method was used to optimize the geometries of 209 PCDE molecules, 209 PBDE molecules and 75 PCDD molecules at the B3LYP/6-31G* level. Using computed structural parameters as theoretical descriptors, the forward stepwise multiple regression technique was adopted to obtain QSPR models of environmental partition properties for these POPs by using GQSARF 2.0 and SPSS12.0 for windows programs. The obtained QSPR models are as follows:(1) QSPR models for predicting subcooled liquid vapor pressure, n-octanol/water partition coefficients lgK_(ow and subcooled liquid water solubilities -lgS_(w,l of PCDEs, of which correlative coefficients (R~2) are 0.988, 0.958 and 0.959 and the root-mean-square-error of estimation are 0.134, 0.116 and 0.327 respectively.(2) QSPR models of lgPL and n-octanol/air partition coefficients lgK_(oa for PBDEs, which both contain three structural parameters. The values of R2 for the two models are both 0.997 while the values of RMSEE are 0.073 and 0.062 respectively.(3) QSPR models of lgKow and–lgS_ for PCDEs, which both have one variable (mean molecular polarizability,α). The values of R~2 for the two models are 0.978 and 0.866 and the values of RMSEE are 0.300 and 0.270 respectively.(4) The molecular structures of 24 substituted naphthaline compounds were optimized using Hartree-Fock and DFT methods at four different levels and the same means was used to obtain four three-parameter (EHOMO, q~+ andα) QSPR models of lgK_. The model at the HF/6-311G** level is the best one of which R2 is 0.9662 and RMSEE is 0.380.(5) QSPR study for environmental partition properties of PCDEs was also performed using position of Cl substitution method in which simple parameters of substitution position were taken as descriptors. The multiple linear regression was performed with GQSARF 2.0 and SSPS 12.0 for windows programs to obtain QSPR models of lgP_L, lgK_ and–lgS_ for PCDEs of which R~2 are 0.991, 0.983 and 0.965 and RMSEE are 0.311, 0.100 and 0.300 respectively.

采用密度泛函理论方法在B3LYP/6-31G*水平上对PCDEs、PBDEs和PCDDs的分子结构进行了全优化计算，以计算得到的量子化学参数作为理论描述符，采用GQSARF 2.0和SPSS 12.0 for windows统计程序进行正向逐步回归分析，建立了这些POPs的环境分配性质的QSPR模型：(1) PCDEs的过冷液体蒸汽压、正辛醇/水分配系数lgK_(ow和水溶解度-lgS_(w，l的QSPR模型，这3个QSPR模型的相关系数(R2)分别为0.988、0.958和0.959，估计的均方根误差分别为0.134、0.116和0.327；(2) PBDEs的lgPL和正辛醇/空气分配系数lgK_(oa的QSPR模型，这两个模型都包含三个分子结构参数，其R~2都为0.997，RSMEE分别为0.073和0.062；(3) PCDDs类化合物的lgK_和-lgS_w的QSPR模型，两个模型都只含一个变量，其R~2分别为0.978和0.866，RSMEE分别为0.300和0.270；(4)采用Hartree-Fock和DFT方法，在4种不同水平上优化计算了24个取代萘系列化合物的分子结构，采用上述同样的方法分别建立了四种水平上的三变量lgK_模型，通过比较得到，在HF/6-311G**水平计算得到的模型最好，R为0.966，RSMEE为0.380；(5)同时，采用氯原子取代位置方法对PCDEs的环境分配性质进行QSPR研究，建立了PCDEs的lgPL、lgK_和-lgS_的QSPR模型，其R~2分别为0.991、0.983和0.965，RSMEE分别为0.110、0.100和0.300。

According to this research, the root mean square error could achieve ±1.156cm,±1.253cm and ±1.376cm by adopting hyperbolic mode, three times of the distance mode and distance square model. Its precision is good enough for engineering measurement. It provides not only the quicker methods to measure the orthometric height on survey engineer, but also a academic reference on regional geoid model

实验结果发现，经数学模式改正后双曲线模式、距离三次方模式及距离平方模式分别能达到±1.156cm、±1.253cm及±1.376cm合乎工程测量规范之标准，本研究在工程上不仅提供实务上快速测得正高的方法，於学术上亦可提供区域性大地起伏模型相关研究之参考。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。