Forecasting Player Behavioral Data and Simulating in-Game Events

Understanding player behavior is fundamental in game data science. Video games evolve as players interact with the game, so being able to foresee player experience would help to ensure a successful game development. In particular, game developers need to evaluate beforehand the impact of in-game events. Simulation optimization of these events is crucial to increase player engagement and maximize monetization. We present an experimental analysis of several methods to forecast game-related variables, with two main aims: to obtain accurate predictions of in-app purchases and playtime in an operational production environment, and to perform simulations of in-game events in order to maximize sales and playtime. Our ultimate purpose is to take a step towards the data-driven development of games. The results suggest that, even though the performance of traditional approaches such as ARIMA is still better, the outcomes of state-of-the-art techniques like deep learning are promising. Deep learning comes up as a well-suited general model that could be used to forecast a variety of time series with different dynamic behaviors

A new accuracy measure based on bounded relative error for time series forecasting

Many accuracy measures have been proposed in the past for time series forecasting comparisons. However, many of these measures suffer from one or more issues such as poor resistance to outliers and scale dependence. In this paper, while summarising commonly used accuracy measures, a special review is made on the symmetric mean absolute percentage error. Moreover, a new accuracy measure called the Unscaled Mean Bounded Relative Absolute Error (UMBRAE), which combines the best features of various alternative measures, is proposed to address the common issues of existing measures. A comparative evaluation on the proposed and related measures has been made with both synthetic and real-world data. The results indicate that the proposed measure, with user selectable benchmark, performs as well as or better than other measures on selected criteria. Though it has been commonly accepted that there is no single best accuracy measure, we suggest that UMBRAE could be a good choice to evaluate forecasting methods, especially for cases where measures based on geometric mean of relative errors, such as the geometric mean relative absolute error, are preferred

Economic measures of forecast accuracy for demand planning : a case-based discussion

Successful demand planning relies on accurate demand forecasts. Existing demand planning software typically employs (univariate) time series models for this purpose. These methods work well if the demand of a product follows regular patterns. Their power and accuracy are, however, limited if the patterns are disturbed and the demand is driven by irregular external factors such as promotions, events, or weather conditions. Hence, modern machine-learning-based approaches take into account external drivers for improved forecasting and combine various forecasting approaches with situation-dependent strengths. Yet, to substantiate the strength and the impact of single or new methodologies, one is left with the question how to measure and compare the performance or accuracy of different forecasting methods. Standard measures such as root mean square error (RMSE) and mean absolute percentage error (MAPE) may allow for ranking the methods according to their accuracy, but in many cases these measures are difficult to interpret or the rankings are incoherent among different measures. Moreover, the impact of forecasting inaccuracies is usually not reflected by standard measures. In this chapter, we discuss this issue using the example of forecasting the demand of food products. Furthermore, we define alternative measures that provide intuitive guidance for decision makers and users of demand forecasting

Predicting Saudi stock market Index by Incorporating GDELT using multivariate time series modelling

Prediction of financial and economic markets is very challenging but valuable for economists, business owners, and traders. Forecasting stock market prices depends on many factors, such as other markets’ performance, economic state of a country, and others. In behavioral finance, people’s emotions and opinions influence their transactional decisions and therefore the financial markets. The focus of this research is to predict the Saudi Stock Market Index by utilizing its previous values and the impact of people’s sentiments on their financial decisions. Human emotions and opinions are directly influenced by media and news, which we incorporated by utilizing the Global Data on Events, Location, and Tone (GDELT) dataset by Google. GDELT is a collection of news from all over the world from different types of media such as TV, broad- casts, radio, newspapers, and websites. We extracted two time series from GDELT, filtered for Saudi Arabian news. The two time series rep- resent daily values of tone and social media attention. We studied the characteristics of the generated multivariate time series, then deployed and compared multiple multivariate models to predict the daily index of the Saudi stock market

Recurrence Analysis - Method and Applications

For alongtime,sciencehasbeenconsideredasasetofactivitiesconsistingof explaining,predicting,andverifyingphenomenaintermsofcause–effectrela- tionships.Thisperspectiveofinquiry,mainlybasedontheverification ofgeneral laws andanobjective,measurable,predictableideaofreality,underwentan importantphaseoftransformationattheendofthenineteenthcenturywhich markedachangeforthescientific rationalitymodelinbothnaturalandsocial sciences.Morespecifically,incontrasttothepredominantideaofsciencebasedon perfect determinism,thecorrectpredictionandrepeatabilityofresults,andacon- ceptionofrealityassimpleandordered,anewmodelofthinkingemergedwhich recognizedthenatureofscienceasbounded,probabilistic,pluralistic,andcon- stantly evolving.Thechangeofperspectivederivesfromtherecognitionofcom- plex phenomena(Eveetal. 1997; Byrne 2013; ByrneandCallaghan 2013), where behaviourisnotnecessarilydeterminedbyproportionalrelationshipsofcauseand effect.Thisinformsaweakerbutmorerealisticconceptionofdeterminism(Ber- tuglia andVaio 2003), whichcanalsoaccountforemergentandmultidimensional phenomena.Theepistemologicalaspectsinvolvedalsomethodologicalandtech- nical issues.Inthecaseofthetimeseriesanalysis,aspectrumofmodelshasbeen developed,rangingfromtheclassicaltomodernapproaches(Chatfield 2013)