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u+Z*sigma 這里的u 和sigama不是說(shuō)是需要百分號(hào)的嗎？為啥不除以mid-price 54再使用

bid-ask spread就是offer-bid嗎

老師好，infrequent sampling bias, survivorship bias和selection/reporting bias到底有什么區(qū)別呢？這塊分不清，怎么記憶呢，謝謝。

老師好，選項(xiàng)c怎么理解？具體怎么操作呢？謝謝

老師好，請(qǐng)問(wèn)B. Many of a dealer bank’s prime brokerage clients sell securities in order to increase their cash balance.的意思是brokerage投資者把他們的證券賣了目的是在交易商銀行存錢嗎？謝謝

這個(gè)沒學(xué)過(guò)，是考點(diǎn)嗎？

老師好，所以幸存者偏差到底會(huì)不會(huì)使σ↓呢？謝謝

C為什么不對(duì)

老師好，請(qǐng)問(wèn)capacity ratio和loan commitments ratio有什么區(qū)別呢？謝謝

老師好，請(qǐng)問(wèn)這個(gè)應(yīng)計(jì)利息是0～3時(shí)段的還是3～6時(shí)段的？怎么理解呢？謝謝

不是只有3個(gè)bias嗎？這個(gè)measurement bias能否解釋一下？

老師好，請(qǐng)問(wèn)保證金那額外的100*50%哪去了呢？這兩句話沒有理解。Assume Lever Brothers finances a long position in $100 worth of an equity at the Reg T margin requirement of 50%. It invests $50 of its own funds and borrows $50 from the broker. Immediately following the trade, its margin account has $50 in equity and a $50 loan from the broker (The broker retains custody of the stock as collateral for the loan). 能解釋下這個(gè)變動(dòng)產(chǎn)生的現(xiàn)金變動(dòng)的邏輯嗎？謝謝

老師好， 如果新借入的debt的成本變化了，需要算一個(gè)加權(quán)平均成本cost of debt嗎？有沒有這種例題呢？謝謝

老師好，請(qǐng)問(wèn)這里的buffer是指liquid asset-?嗎？不應(yīng)該只是變動(dòng)量?嗎，不理解為什么要用1billion減去變動(dòng)量，謝謝

turnover bias是描述什么的呢？