最新新概念英语第二册-38课课件ppt
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disappoint vt.使失望）
• I am bitterly disappointed. • bitterly cold 刺骨地寒冷 • It’s bitterly cold. （chilly adj. 寒冷的）
• no sooner…than… 一……就……（关联词，引导 时间状语从句，主句里常用过去完成时，than
gets back. • （directly，instantly）
§2.3 一元线性回归模型的统 计检验
一、拟合优度检验 二、变量的显著性检验 三、参数的置信区间
• 回归分析是要通过样本所估计的参数来代替总 体的真实参数，或者说是用样本回归线代替总 体回归线。
• 尽管从统计性质上已知，如果有足够多的重 复 抽样，参数的估计值的期望（均值）就等 于其总体的参数真值，但在一次抽样中，估计 值不一定就等于该真值。
If you have ever been to England ,you must be impressed by the beautiful scenery.However,everyhing there is perfect except the weather.
• ★complain v. 抱怨 • complain to sb. 向某人抱怨 • complain of/about sth. 抱怨某事
• immediately
• 1.adv • He lay down and was asleep immediately. • All those who are immediately involved
will be informed of the decision.
• 2.conj. • I will tell him the news immediately he
1、总离差平方和的分解
已知由一组样本观测值（Xi,Yi），i=1,2…,n 得到如下样本回归直线
Yˆi ˆ0ˆ1Xi
y i Y i Y ( Y i Y ˆ i) ( Y ˆ i Y ) e i y ˆ i
• ★continuously adv. 不断地，连续地（指动作中间没 有间断）
• You mustn’t watch TV for such a long time continuously.
• This plane can fly continuously for twenty hours. • continually adv. 频繁地，反复地（指动作中间有间
连词as if/though引导方式状语从句，通常跟在描述 行为举止的动词之后，如act，appear，feel，look， smell，sound等后面： She acted as if she were mad. （虚拟语气） It feels as if/though it’s going to rain
• Hardly had he got into the bus when it began moving.
•as if( sometimes subjunctive mood )
•He acts as if he knew me.(事实上并不知道我) •They treat me as if I were a stranger. （我并不 是陌生人） •It looks as if it is going to rain (天要下雨)
新概念英语第二册-38课
1.What is your favourite
warming up city?
2.How is the weather there? 3.Have you ever been to England? 4.Do you know the climate in Enwk.baidu.comland?
• 后面的从句用一般过去时 • had no sooner done…than +一般过去时, 固定
用法 (时态结构: 完成时态+ than + 一般过去 时)
• He had no sooner arrived than he called me up.
• no sooner 放在句首就要倒装
• No sooner had he arrived than he called me up. (倒装)
• No sooner had he begun speaking than he was interrupted.
• more than 表示“超过……的范围”
• This piece of news is more than I can believe.
• It was more than I could understand.
• I can't afford it. ＝ It is more than I can afford.
• hardly…when… 还没来得及……就……，用 法同no sooner…than
• hardly had sb. done when… (hardly在 句首, 要倒装)
• He had hardly opened his eyes when he was knocked out.（knock out : 打晕 , 击倒）
断但又持续很久） • It rained continually. 天频繁地下雨。 • The river flows under this bridge continuously. 河
水不停地从桥下流过.
• ★bitterly adv. 刺骨地 • bitterly disappointed 彻底的失望（
• 那么，在一次抽样中，参数的估计值与真值 的差异有多大，是否显著，这就需要进一步进 行统计检验。
• 主要包括拟合优度检验、变量的显著性检验 及参数的区间估计。
一、拟合优度检验
拟合优度检验：对样本回归直线与样本 观测值之间拟合程度的检验。
度量拟合优度的指标：判定系数（可决 系数）R2
问题：采用普通最小二乘估计方法，已 经保证了模型最好地拟合了样本观测值， 为什么还要检验拟合程度？
• I am bitterly disappointed. • bitterly cold 刺骨地寒冷 • It’s bitterly cold. （chilly adj. 寒冷的）
• no sooner…than… 一……就……（关联词，引导 时间状语从句，主句里常用过去完成时，than
gets back. • （directly，instantly）
§2.3 一元线性回归模型的统 计检验
一、拟合优度检验 二、变量的显著性检验 三、参数的置信区间
• 回归分析是要通过样本所估计的参数来代替总 体的真实参数，或者说是用样本回归线代替总 体回归线。
• 尽管从统计性质上已知，如果有足够多的重 复 抽样，参数的估计值的期望（均值）就等 于其总体的参数真值，但在一次抽样中，估计 值不一定就等于该真值。
If you have ever been to England ,you must be impressed by the beautiful scenery.However,everyhing there is perfect except the weather.
• ★complain v. 抱怨 • complain to sb. 向某人抱怨 • complain of/about sth. 抱怨某事
• immediately
• 1.adv • He lay down and was asleep immediately. • All those who are immediately involved
will be informed of the decision.
• 2.conj. • I will tell him the news immediately he
1、总离差平方和的分解
已知由一组样本观测值（Xi,Yi），i=1,2…,n 得到如下样本回归直线
Yˆi ˆ0ˆ1Xi
y i Y i Y ( Y i Y ˆ i) ( Y ˆ i Y ) e i y ˆ i
• ★continuously adv. 不断地，连续地（指动作中间没 有间断）
• You mustn’t watch TV for such a long time continuously.
• This plane can fly continuously for twenty hours. • continually adv. 频繁地，反复地（指动作中间有间
连词as if/though引导方式状语从句，通常跟在描述 行为举止的动词之后，如act，appear，feel，look， smell，sound等后面： She acted as if she were mad. （虚拟语气） It feels as if/though it’s going to rain
• Hardly had he got into the bus when it began moving.
•as if( sometimes subjunctive mood )
•He acts as if he knew me.(事实上并不知道我) •They treat me as if I were a stranger. （我并不 是陌生人） •It looks as if it is going to rain (天要下雨)
新概念英语第二册-38课
1.What is your favourite
warming up city?
2.How is the weather there? 3.Have you ever been to England? 4.Do you know the climate in Enwk.baidu.comland?
• 后面的从句用一般过去时 • had no sooner done…than +一般过去时, 固定
用法 (时态结构: 完成时态+ than + 一般过去 时)
• He had no sooner arrived than he called me up.
• no sooner 放在句首就要倒装
• No sooner had he arrived than he called me up. (倒装)
• No sooner had he begun speaking than he was interrupted.
• more than 表示“超过……的范围”
• This piece of news is more than I can believe.
• It was more than I could understand.
• I can't afford it. ＝ It is more than I can afford.
• hardly…when… 还没来得及……就……，用 法同no sooner…than
• hardly had sb. done when… (hardly在 句首, 要倒装)
• He had hardly opened his eyes when he was knocked out.（knock out : 打晕 , 击倒）
断但又持续很久） • It rained continually. 天频繁地下雨。 • The river flows under this bridge continuously. 河
水不停地从桥下流过.
• ★bitterly adv. 刺骨地 • bitterly disappointed 彻底的失望（
• 那么，在一次抽样中，参数的估计值与真值 的差异有多大，是否显著，这就需要进一步进 行统计检验。
• 主要包括拟合优度检验、变量的显著性检验 及参数的区间估计。
一、拟合优度检验
拟合优度检验：对样本回归直线与样本 观测值之间拟合程度的检验。
度量拟合优度的指标：判定系数（可决 系数）R2
问题：采用普通最小二乘估计方法，已 经保证了模型最好地拟合了样本观测值， 为什么还要检验拟合程度？