关于增加cash等式SR^2=SRb^2+IR^2 如何平衡的问题

NO.PZ201710100100000504 问题如下 4. Whiof Singh’s statements regarng the information ratio is correct? A.Only Statement 1 B.Only Statement 2 C.Both Statement 1 anStatement 2 C is correct. The information ratio for a portfolio of risky assets will generally shrink if cash is aeto the portfolio. Because the versifieasset portfolio is unconstraineportfolio, its information ratio woulunaffecteincrease in the aggressiveness of active weights.考点 information ratio解析 定性结论，Statement 1 正确，增加cash会导致information ratio减小。Statement 2正确，增加aggressiveness不会改变information ratio。 老师，这最后一道题如何判断有没有TC啊？我看文字上没明确说表述出来，那与表二有关么？我看表二里有TC

NO.PZ201710100100000504 aggressiveness下降的意思和增加cash进去使得基金经理积极主动管理能力下降是一个吗 aggressiveness不影响IR所以cash是不是也不会影响IR 那statement1是错的吗

Only Statement 2 Both Statement 1 anStatement 2 C is correct. The information ratio for a portfolio of risky assets will generally shrink if cash is aeto the portfolio. Because the versifieasset portfolio is unconstraineportfolio, its information ratio woulunaffecteincrease in the aggressiveness of active weights. 考点 information ratio 解析 定性结论，Statement 1 正确，增加cash会导致information ratio减小。Statement 2正确，增加aggressiveness不会改变information ratio。老师 这道题可以深入一下为什么a cash会导致IR下降吗？我笔记上记了IR is unaffectethe aition of cash or the use of leverage or the aggressiveness of active weights 请问哪里错了呀 谢谢老师！

    constrain funIR会收到aggressive的影响。而这题的portfolios's TC＜1，因此是constrain fun这两个comment跟在这道题下面，让我认为statement 2是错的。