Gallery. 1  Hand-cranked planetary sharpener, with cover in place. 2  Hand-cranked planetary sharpener from 1950â60, with cover removed. 3  Hand-cranked planetary sharpener with spring-driven pencil holder. 4  AC-powered electric pencil sharpener. 5  Battery-operated sharpener.
Description. Tracking Error is a measure of how closely an ETF follows its benchmark index. This data point seeks to isolate the ability of the portfolio managers to track the index, ignoring the confounding effects of ETF liquidity on market prices.escription. Tracking Error is a measure of how closely an ETF follows its benchmark index. This data point seeks to isolate the ability of the portfolio managers to track the index, ignoring the confounding effects of ETF liquidity on market prices.
The vast majority of ETFs aim to track an indexâwhich means that ETFs try to deliver the same returns as a particular index. Tracking difference is the discrepancy between ETF performance and index performance.Tracking difference is rarely nil: The ETF usually trails its index.otal Expense Ratio. An ETFâs total expense ratio (TER) is the single best indicator of future tracking difference. If an ETF charges 1 percent to track an index, then all else equal, ETF returns ought to lag index returns by exactly 1 percent.