adjusted closing price股票的调整后价格

Getsymbols从雅虎拿到的股票数据有6列，
 XLF.Open XLF.High  XLF.Low XLF.Close XLF.Volume XLF.Adjusted


其中比较tricky的就是Adjusted。网上找到的内容很多，但是都不太细致全面，对于非金融专业的人来说，理解还是比较困难。 今天就来细说一下。其实也很好理解了。


http://www.investopedia.com/ask/answers/06/adjustedclosingprice.asp


因为收盘价本身可能不能完全反应股票的价值，比如现金分红，股票分红，股票分割。


1. 现金分红：股票的调整价格应该在收盘价的基础上减掉现金分红的部分。比如XYZ公司收盘价是20块钱，收盘后公司宣布会每股分红1.5块，那么股票调整价格就是18.50块。（非常容易吧！）


2. 股票分红：如果公司决定不分现金，而分给你股票。比如公司宣布2:1的股票分红，也就是每一份股票会分给你两份新的股票（这只是个例子）。那么股票调整价格就是$20*(1/(2+1))=6.67块。


3. 股票分割：如果是2:1的股票分割，那么意味着每一股会得到一股新的股票。那么股票调整价格就是$20*(1/(1x2))=10块。


简单来说，调整价格能更好的反应出股票实际的价格。


During the course of a trading day, many things can happen to affect a stock's price. Along with good and bad news relating to the operations of a company, any sort of distribution that is made to investors will also affect stock price. These distributions can include cash dividends, stock dividends and stock splits.


When distributions are made, the adjusted closing price calculations are quite simple. For cash dividends, the value of the dividend is deducted from the last closing sale price of the stock. For example, let's assume that the closing price for one share of XYZ Corp. is $20 on Thursday. After close on Thursday, XYZ Corp. announces a dividend distribution of $1.50 per share. The adjusted closing price for the stock would then be $18.50 ($20-$1.50).


If XYZ Corp. announces a 2:1 stock dividend instead of a cash dividend, the adjusted closing price calculation will change. A 2:1 stock dividend means that for every share an investor owns, he or she will receive two more shares. In this case, the adjusted closing price calculation will be $20*(1/(2+1)). This will give you a price of $6.67, rounded to the nearest penny.


If XYZ Corp. announces a 2:1 stock split, investors will receive an extra share for every share they already own. This time the calculation will be $20*(1/(1x2)), resulting in an adjusted closing price of $10.