多元回归分析

The nitrogen availability index of green manure has been discussed.

多元回归与相关的分析结果指出，提高绿肥N有效度要求高氮又高碳和低C∶N比；4。

Each cultivar was found to have a specific peak milking stage, during which the entrance of nutrition into grains tended to follow an indicial equation of y=ab~x.

对于影响灌浆的多种外界因素，经过多元逐步回归分析，提出了影响粒重的主要因素最优方程。

A mathematical model among the investment,cost and income and internal rate of return was established.

在分析高含硫气田开发经济评价特点的基础上，运用技术经济的基本原理，在估算开发投资、成本、收入的基础上，建立了高含硫气田经济评价模型，通过实例计算出不同投资、成本、价格下的内部收益率，并运用SPSS软件对数据进行一元和多元回归处理，得到投资、成本、价格与内部收益率之间的数学模型。

The reference crop evapotranspiration(ET0) in Guanzhong region was calculated with the Penman-Monteith equation. The change characteristics of meteorological factors and ET0 over year were analyzed. The regressing relation between ET0 and geography factors was established. Space distribution of ET0 based digital elevation model was obtained. The water consumption model of main cropes was established using the crop cofficient method. The irrigation water requirement of main crop and it's space distribution based DEM under the different precipitation probability was obtained, which advanced the calculation precision of ET0 from spot scal to regional scal. The concept of water consumption under the irrigational scal was proposed. The water consumption model of different water user and model of groundwater balance based on the water consumption of Baojixia irrigation district was established. Which can refects the relation between water utilization, water consumption and change amount of groundwater resouces.

深入分析了关中地区气象要素的变化趋势，用Penman-Montainth 公式计算了参考作物蒸发蒸腾量（ET0），建立了ET0与地理要素的多元回归关系，获得了基于数字高程模型DEM的关中地区ET0的空间分布图；用作物系数法建立了关中主要作物生育期耗水模型，获得了主要作物在不同降雨条件下的灌溉需水，以及基于DEM的主要作物灌溉需水空间分布图，提高了作物蒸发蒸腾量由点到面尺度转换过程中的估算精度；界定了灌区尺度的耗水量的概念，包括用水耗水和非用水耗水，建立了灌区耗水量计算模型及基于耗水量变化的浅层地下水均衡模型，能较好地反映灌区引水量、耗水量及地下水蓄变量之间的内在关系。

Methods:We investigated factors of 848 girls aged 14~16 years and their mothers, then analyzed the relationship between age at menarche and these factors using multiple linear regression.

方法调查848名年龄在14~16岁之间的女生及母亲的相关因素，用多元线性回归分析这些因素与初潮年龄的关系。

Through multilinear regression analysis the trees' height is major factor for the rice yields.

经多元逐步回归分析，树高是影响水稻产量的主导因素。

Descriptive statistics, Pearson correlation and Stepwise multiple regression were employed to address the research questions.

本研究采用描述统计、皮尔逊积差相关分析以及逐步多元回归来探讨1学生英语教室结构认知的现况2学生英语成就目标动机的现况3英语教室结构认知与成就目标动机的相关性，以及4四个教室结构对精进目标的预测性。

Taken Qinshui Basin as an example a predictive model of gas content is established by multiple stepwise regression analysis, using Langmuir volume and gas saturation as its parameters. The result of multiple correlation coefficient testing, F-testing and t-testing indicates that the model meets the hypothesis testing of linearity and its matching effect is preferable.

以沁水盆地为例，运用多元逐步回归分析方法，建立了以Langmuir体积和含气饱和度为参数的含气量预测模型；复相关系数、F检验、t检验结果表明，该模型满足线性与方差齐性的假设，拟合效果较好。

There was no factors which is constantly related to arterial IMT and function in the stepwise multiple regression analysis.

多元逐步回归分析在所观察的参数中未发现和血管结构与功能有固定关系的因素。

The collected data were analyzed by t-test and multiple stepwise regression analysis.

并将所搜集的资料以独立样本t考验和多元逐步回归分析来探讨。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐