# market microstructure Volatility on Avellaneda Stoikov MM Quantitative Finance Stack Exchange

Finally, we demonstrate the significance of this novel system in multiple experiments. The AS model generates bid and ask quotes that aim to maximize the market maker’s P&L profile for a given level of inventory risk the agent is willing to take, relying on certain assumptions regarding the microstructure and stochastic dynamics of the market. Extensions to the AS model have been proposed, most notably the Guéant-Lehalle-Fernandez-Tapia approximation , and in a recent variation of it by Bergault et al. , which are currently used by major market making agents. Nevertheless, in practice, deviations from the model scenarios are to be expected. Under real trading conditions, therefore, there is room for improvement upon the orders generated by the closed-form AS model and its variants.

The results obtained suggest avenues to explore for further improvement. First, the reward function can be tweaked to penalise drawdowns more directly. Other indicators, such as the Sortino ratio, can also be used in the reward function itself. Another MATIC approach is to explore risk management policies that include discretionary rules.

## Related work on machine learning in trading

The agent will place orders at the resulting skewed bid and ask prices, once every market tick during the next 5-second time step. In order to analyze the experimental results, we work on the models that we have derived using different metrics. It is salient to mention that the market maker modifies her qualitative behavior in various situations, i.e., changing inventory levels, utility functions. By our numerical results, we deduce that the jump effects and comparative statistics metrics provide us with the information for the traders to gain expected profits. For instance, the model given by has a considerable Sharpe ratio and inventory management with a lower standard deviation comparing to the symmetric strategy. Besides, we further quantify the effects of a variety of parameters in models on the bid and ask spreads and observe that the trader follows different strategies on positive and negative inventory levels, separately.

- The minimum_spread parameter is optional, it has no effect on the calculated reservation price and the optimal spread.
- The resulting Gen-AS model, two non-AS baselines (based on Gašperov ) and the two Alpha-AS model variants were run with the rest of the dataset, from 9th December 2020 to 8th January 2021 , and their performance compared.
- The original Avellaneda-Stoikov model was designed to be used for market making on stock markets, which have defined trading hours.
- Figures for Alpha-AS 1 and 2 are given in green if their value is higher than that for the AS-Gen model for the same day.

We plan to use such approximations in further tests with our avellaneda stoikov approach. As stated in Section 4.1.7, these values for w and k are taken as the fixed parameter values for the Alpha-AS models. They are not recalibrated periodically for the Gen-AS so that their values do not differ from those used throughout the experiment in the Alpha-AS models. If w and k were different for Gen-AS and Alpha-AS, it would be hard to discern whether observed differences in the performance of the models are due to the action modifications learnt by the RL algorithm or simply the result of differing parameter optimisation values.

## current community

Table11 which is obtained from all simulations depicts the results of these two strategies. We can see that when the jumps occur in volatility, it causes not only larger profits but also larger standard deviation of the profit and loss function. It is observed that the thickness of the market prices is correlated with the trading intensity inversely. As a larger trading intensity decreases the market impact in execution which leads a decrease in price movements; it causes a lower price that is presented in Fig.

A thread on Avellaneda-Stoikov market making formula. https://t.co/S03nMErQFF

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Therefore the strategy may take longer than 200 seconds to start placing orders. Both the start_time and the end_time parameters are defined to be in the local time of the computer on which the client is running. Since cryptocurrency markets are open 24/7, there is no “closing time”, and the strategy should also be able run indefinitely, based on an infinite timeframe.

After a theoretical presentation of the method, an application using real https://www.beaxy.com/ will be presented to demonstrate how the method works. Random forest is an efficient and accurate classification model, which makes decisions by aggregating a set of trees, either by voting or by averaging class posterior probability estimates. However, tree outputs may be unreliable in presence of scarce data. The imprecise Dirichlet model provides workaround, by replacing point probability estimates with interval-valued ones. This paper investigates a new tree aggregation method based on the theory of belief functions to combine such probability intervals, resulting in a cautious random forest classifier. In particular, we propose a strategy for computing tree weights based on the minimization of a convex cost function, which takes both determinacy and accuracy into account and makes it possible to adjust the level of cautiousness of the model.

Together, a) and b) result in a set of 2×10d contiguous buckets of width 10−d, ranging from −1 to 1, for each of the features defined in relative terms. Approximately 80% of their values lie in the interval [−0.1, 0.1], while roughly 10% lie outside the [−1, 1] interval. Values that are very large can have a disproportionately strong influence on the statistical normalisation of all values prior to being inputted to the neural networks. By trimming the values to the [−1, 1] interval we limit the influence of this minority of values.

## High frequency trading and the new market makers

Hence, market makers try to minimize risk by keeping their inventory as close to zero as possible. Market makers tend to do better in mean-reverting environments, whereas market momentum, in either direction, hurts their performance. The strategy calculates the reservation price and the optimal spread based on measurements of the current asset volatility and the order book liquidity. The asset volatility estimator is implemented as the instant_volatility indicator, the order book liquidity estimator is implemented as the trading_intensity indicator.

Alpha-AS-1 had 11 victories and placed second 16 times (losing to Alpha-AS-2 on 14 of these). AS-Gen had the best P&L-to-MAP ratio only for 2 of the test days, coming second on another 4. The mean and the median P&L-to-MAP ratio were very significantly better for both Alpha-AS models than the Gen-AS model. On this performance indicator, AS-Gen was the overall best performing model, winning on 11 days. The mean Max DD for the AS-Gen model over the entire test period was visibly the lowest , and its standard deviation was also the lowest by far from among all models.

It is necessary to pay more attention on the minority cases and capture the patterns of these valuable long and short signals. Then, the avellaneda stoikov trained daily or weekly can predict trading actions and the probability of each choice at every tick. The next step is to trade the securities based on the information yielded by the predictions. Instead of investing the same proportion consistently, we devise an optimization scheme using the fractional Kelly growth criterion under risk control, which is further achieved by the risk measure, value at risk . Based on the estimates of historical VaR and returns for successful/failed actions, we provide a theoretical closed-form solution for the optimal investment proportion.

### Top 10 Quant Professors 2022 – Rebellion Research

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Consequently, we support our findings by comparing the models proposed within this research with the stock price impact models existing in literature. Last but not least, we have substantially improved the performances of a market maker with the proposed models. Table13 which is achieved from all simulations demonstrates that the Model C which is the stock price modeling with stochastic volatility, has relatively larger expected return, but also a relatively larger standard deviation. Meanwhile, the other stock price modelings in Table13 produce higher Sharpe ratios. 2, we set the framework in continuous time and formulate the optimization problem in terms of the expected return of the trader. Section3 is dedicated to the study of the stochastic control and Hamilton-Jacobi-Bellman equations for the model proposed in Sect.

One way to improve the performance of an AS model is by tweaking the values of its constants to fit more closely the trading environment in which it is operating. In section 4.2, we describe our approach of using genetic algorithms to optimize the values of the AS model constants using trading data from the market we will operate in. Alternatively, we can resort to machine learning algorithms to adjust the AS model constants and/or its output ask and bid prices dynamically, as patterns found in market-related data evolve. To this approach, more specifically one based on deep reinforcement learning, we turn to next. In this paper, we investigated the high-frequency trading strategies for a market maker using a mean-reverting stochastic volatility models that involve the influence of both arrival and filled market orders of the underlying asset. First, we design a model with variable utilities where the effects of the jumps corresponding to the orders are introduced in returns of the asset and generate optimal bid and ask prices for trading.