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Electromagnetic (e.g. radio or light) waves are conceptually pure single frequency phenomena while pulses may be mathematically thought of as composed of a number of pure frequencies that sum and nullify in interactions that create a pulse train of the specific amplitudes, PRRs, base frequencies, phase characteristics, et cetera (See Fourier Analysis).
Pulse repetition frequency (PRF) is too low to sample Doppler frequency directly; PRF is too high to sample range directly; Pulse Doppler sonar uses similar principles to measure position and velocity involving liquids.
The difference between the sample numbers where reflection signal is found for these two PRF will be about the same as the number of the ambiguous range intervals between the radar and the reflector (i.e.: if the reflection falls in sample 3 for PRF 1 and in sample 5 for PRF 2, then the reflector is in ambiguous range interval 2=5-3).
Therefore, a market for a security in which there are many buyers and sellers would feature a large volume and thus high liquidity. [5] [6] Due to volume's relevance with respect to liquidity, it is used by some traders to form exit strategies, due to the inherent risks of trading an asset with low liquidity. [3]
3. Markets have changed since 1985/1991. Pits are approaching extinction. In 1985 and earlier, trading by members in the pits was by open outcry; commercial traders were in view and the 'trade' dominated the markets. Today (2011) there are few pits and public traders dominate the trading volume.
Some high-frequency trading firms use market making as their primary strategy. [10] Automated Trading Desk (ATD), which was bought by Citigroup in July 2007, has been an active market maker, accounting for about 6% of total volume on both the NASDAQ and the New York Stock Exchange. [36] In May 2016, Citadel LLC bought assets of ATD from Citigroup.
In other words, after prices have moved up on positive volume days, "if prices stay up when the volume subsides for a number of days, we can say that such a move is 'good'." If the market “holds its own on negative volume days after advancing on positive volume, the market is in a strong position.” He called PVI the “majority” curve.
A TWAP strategy is often used to minimize a large order's impact on the market and result in price improvement. [2] High-volume traders use TWAP to execute their orders over a specific time, so they trade to keep the price close to that which reflects the true market price. TWAP orders are a strategy of executing trades evenly over a specified ...