要明确实际波动率，首先要从波动率的概念入手。波动率（Volatility）：是指关于资产未来价格不确定性的度量。它通常用资产回报率的标准差来衡量。也可以指某一证券的一年最高价减去最低价的值再除以最低价所得到的比率。业内将波动率定义为价格比率自然对数的标准差。波动率的种类有：实际波动率，隐含波动率，历史波动率等等，实际波动率便是波动率的一种。
VMware Workstation 6.0 Beta for Windows 版本 下载连接 文件大小:273 MB http://download3.vmware.com/software/wkst/VMware-workstation-e.x.p-39849.exe
md5sum: 1ac91449a2828ef54c1644f2d090ad19
VMware Workstation 6.0 Beta (for Linux systems) - 32 bit 177 MB
rpm包 http://download3.vmware.com/software/wkst/VMware-workstation-e.x.p-39849.i386.rpm
md5sum: f8b270728983c4e23bd367b8fb96d0fc
tar包 http://download3.vmware.com/software/wkst/VMware-workstation-e.x.p-39849.i386.tar.gz
md5sum: 8f875f109eda2d05a77cbb522f5c0fb4
VMware Workstation 6.0 Beta (for Linux systems) - 64 bit 148 MB
rpm包 http://download3.vmware.com/software/wkst/VMware-workstation-e.x.p-39849.x86_64.rpm
md5sum: 8f25831232a83a86b6ced708cf6306b3
tar包 http://download3.vmware.com/software/wkst/VMware-workstation-e.x.p-39849.x86_64.tar.gz
md5sum: af9aadd9611656ce971daf1c1b8c1b4c
SDK 开发包
VMware Windows VIX Installer
Beta Version | 2/8/07 | Build 39849 | 11.4 MB
http://download3.vmware.com/software/wkst/VMware-vix-e.x.p-39849.exe
md5sum: 297cd26ddb27cab827ba35c37364dcbf
VMware Linux VIX Installer - 32bit
Beta Version | 2/8/07 | Build 39849 | 5.89 MB
http://download3.vmware.com/software/wkst/VMware-vix-e.x.p-39849.i386.tar.gz
md5sum: 6164da1ec6d95c07d5eba697790fcad0
VMware Linux VIX Installer - 64bit
Beta Version | 2/8/07 | Build 39849 | 7.54 MB
http://download3.vmware.com/software/wkst/VMware-vix-e.x.p-39849.x86_64.tar.gz
md5sum: 43ed7b124b9308d77f35b467781d97f7
