牧龙在野!

Variance, Beta and Risk 对我来说，是比较容易混淆的概念，需要熟读的~


In probability theory and statistics, the variance of a random variable, probability distribution, or sample is one measure of statistical dispersion, averaging the squared distance of its possible values from the expected value(mean). Whereas the mean is a way to describe the location of adistribution, the variance is a way to capture its scale or degree ofbeing spread out. The unit of variance is the square of the unit of the original variable. The positive square root of the variance, called the standard deviation, has the same units as the original variable and can be easier to interpret for this reason.The variance of a real-valued random variable is its second central moment, and it also happens to be its second cumulant.Just as some distributions do not have a mean, some do not have avariance as well. The mean exists whenever the variance exists, but notvice versa.

The Beta coefficient, in terms of finance and investing, is a measure of volatility of a stock or portfolio in relation to the rest of the financial market.^[1]

An asset with a beta of 0 means that its price is not at all correlated with the market; that asset is independent. A positive beta means that the asset generally follows the market. A negative beta shows that the asset inversely follows the market; the asset generally decreases in value if the market goes up.

Correlations are evident between companies within the same industry, or even within the same asset class (such as equities), as was demonstrated in the Wall Street crash of 1929. This correlated risk, measured by Beta, creates almost all of the risk in a diversified portfolio.

The beta coefficient is a key parameter in the capital asset pricing model (CAPM). It measures the part of the asset's statistical variance that cannot be mitigated by the diversification provided by the portfolio of many risky assets, because it is correlated with the return of the other assets that are in the portfolio. Beta is calculated for individual companies using regression analysis.

转贴内容，以备学习之用：

三角函数相关公式大全关键词：          三角公式             三角函数                                                                     最近复习微积分,几个三角函数的转换弄得我晕头转向,本来高中的时候就没记熟,现在又得记一遍了=.=好郁闷,进度太慢了...
1 三角函数的定义1.1 三角形中的定义[align=center]
图1 在直角三角形中定义三角函数的示意图[/align][align=left]    在直角三角形ABC，如下定义六个三角函数：[/align][list][*][align=left]正弦函数
[/align][*][align=left]余弦函数
[/align][*][align=left]正切函数
[/align][*][align=left]余切函数
[/align][*][align=left]正割函数
[/align][*][align=left]余割函数
[/align][/list]1.2

文学城上有位老兄居然找到了30多年前的高考题，现在贡献出来跟大家一起做做，看看都能得多少分。

1977年语文高考试卷

一、给下面这句话注音，要标调（3分）将正确的答案填写到下面的横线上
对待同志要象春天般温暖。


二、回答下列问题 将正确的答案填写到下面的横线上
1.指出下面句子中加粗的词属于什么词类（2分）
雷锋为（人民）服务的心最红

2.指出下面复杂词组中的每个词组属于哪种类型（4分）
恢复和发扬毛主席树立的优良传统和作风

3.分析句子成分（4分）
为了实现Communist主义的伟大理想，我要献出自己的毕生精力和整个生命。

4.分析多层复句的层次关系（3分）
因为我们是为人民服务的，所以，我们如果有缺点，就不怕别人批评指出。

A woman applies for two jobs, job A and job B. She thinks that she has 60% chance of getting job A and a 50% chance of getting job B. She also thinks that if she gets A, then the chance of her getting B increases to 70%.

Required:
1. Find the probability that she will get one job exactly;
2. Find the probability that she will get both jobs.
3. Find the probability that she will get job A if she knows already that she has get job B.

What are the different ways of measuring the success of Mergers and Acquisitions?

今儿不把它写完，誓不为人。。。

想当年在学校里头，一起学国际关系来着。
不过他后来考上了北大和英国伦敦政治经济学院的双硕士了。而我只是一个硕士，在悉尼大学。
然后他又考上剑桥了。
我还在读着这个硕士，尚未毕业。

祝贺大个~~李晨~~

哎。。。伤感。

英文适用

Your report should be with 1.5 line spacing and size 12 Times New Roman Font.

The following is an extract from the Journal of Finance submission guidelines. This the method to be
used in referencing material for your major assignment.
References must be typed on a separate page, double-spaced, at the end of the paper. References
to publications in the text should appear as follows: "Jensen and Meckling (1976) report that..." or
"(Jenson and Meckling (1976))." At the end of the manuscript (before tables and figures), the
complete list of references should be as follows:
For monographs:
Fama, Eugene F., and Merton H. Miller, 1972. The Theory of Finance (Dryden Press, Hinsdale, Ill.).
For contributions to collective works:
Grossman, Sanford J., and Oliver D. Hart, 1982, Corporate financial structure and managerial
incentives, in John J. McCall, ed.: The Economics of Information and Uncertainty (University of
Chicago Press, Chicago, Ill.).
For periodicals:
Jensen, Michael C., and William H. Meckling, 1976, Theory of the firm: Managerial behavior, agency
costs and ownership structure, Journal of Financial Economics 3, 305-360
(http://www.afajof.org/journal/submission.asp)