不偏

If we have omitted important factors that are correlated with the explanatory variables, then the coefficient estimates are not reliable: OLS is biased.

如果存在严重的缺省变量问题，那么OLS估计就是有偏的；如果存在异方差，那么标准误就不能用于估计标准差，因而在这些问题下构造出的置信区间并不是真正的95％CI。

The wall has no support during the construction stage and the calculationbased on the national standard GB 50018-2002 (Technical code of cold-formedthin-wall steel, structures) should be reliable and safe. The crankle destabilizationof the studs with cold-formed channel section should be taken into account whencalculating the load-carrying capacity. The warpings at both ends of the sectionshould be calculated without any constraint when converting the crankledestabilization into the slenderness rationλ_w.

墙体在施工阶段基本为无墙体支撑，此时，按现行国标《冷弯薄壁型钢结构技术规程》(GB 50018-2002)规定计算是可靠、偏安全的，在计算其承载能力时应考虑单轴对称冷弯卷边槽钢截面立柱弯扭失稳，在计算立柱弯扭失稳换算长细比λ_w时，截面两端翘曲宜按不受到约束条件计算。

The results are as following:The study shows that a main factor that restricts the plant yield and quality of water chestnut is the low level of prevention and control of water chestnut culms damping-off; a disease of the water chestnut.

荸荠种植产量和质量偏低，使得农户种植荸荠不能获取较大的经济效益。

The main drawbacks are high price of the commodity house , the defectiveness of housing financial market and housing exchange market.

产生这一现象的原因是多方面的，笔者认为最主要的原因在于商品住宅价格偏高、住房金融市场发展缓慢以及住房交易市场不健全三个方面。

However, the social natural resources of the obtain employment cost of the idea of traditional obtain employment as a result of situation of grim integral obtain employment, stale, insalubrious obtain employment psychology, inferior integrated quality, high specified number and deficient, impoverished undergraduate makes an appointment with time, autograph to restrict range of tripartite of post of course of study of rate, choose in the autograph graduate of more average college appears lag, on the low side and deviation.

然而，由于严重的整体就业形势、陈旧的传统就业观念、不健康的就业心理、较低的综合素质、高额的就业成本以及匮乏的社会资源，贫困大学生在签约时间、签约率、择业岗位三方面较普通大学毕业生显得滞后、偏低和偏差。

If the light permeation of polarimeter is not parallel or vertical to the incidence plane, the polarized light exists an angle of deflexion.

指出如果偏振片不与入射面垂直和平行，此时的偏振光存在一定角度的偏转，此时国内与国外仪器测定的结果是不同的。

There deliquescence. Heated to 400 degrees Celsius by melting a transparent liquid, solidified after cooling to the glassy opaque partial potassium phosphate.

加热至摄氏400度时熔化而成透明的液体，冷却后固化为不透明的玻璃状偏磷酸钾。

The dependance of the strong field resonance on the polarization of the excitationlaser beam seems not fully consistent with predictions and a further study i...

指出强场共振的发生与双光子激发光偏振特性的关系与预期不尽符合。

To illustrate the present depolarizer which be used to handle the SOP of the incoming light.

我们提出，当光行走的路程不同，叠加后不会产生光同调的理论，来达到解偏振的目的，是此研究的目标。

And had proven the essence of submit function on geo-technical material is under certain stress condition between the second deviator stress tensor invariant and the own attribute functional relation of materials.

证明了岩土类介质屈服函数的实质是在一定应力状态下偏应力张量第二不变量与材料自身属性之间的函数关系。

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。