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Poster_final
1.
RESEARCH POSTER PRESENTATION
DESIGN © 2015 www.PosterPresentations.com How much can one know about your personality just by looking at the way you use your phone? Smartphones are increasingly seen as large-scale sensors of human activity recording data related both to physical and social pace of people’s lives. This brings an enormous potential to the use of phones as part of large-scale behavioral studies. We describe a novel approach to model an individual’s “risk taking propensity” based on his/her phoneotype i.e. a composite of an individual’s behavioral traits as observable via a mobile phone usage. Risk Propensity as a field of study Risk propensity is the stable tendency to choose options with a lower probability of success, but greater rewards. The concept of risk propensity has important implications for the theoretical modeling of risk behavior and for practical insights into the motives underlying individual level choices about engaging in risky behavior. In organizational terms, a better understanding of risk behavior could contribute significantly to risk management programs. ABSTRACT INTRODUCTION Data: The data used in this paper was obtained as part of the Rutgers Well-being study. The empirical sections of this work are based on a dataset collected in a major US research university. Each participant was equipped with a Android smartphone running the open sensing framework . Out of the 54 participants in the resulting dataset, 35 were male, and 19 were female. The most common age group was 18-21 years, most common marital status was single, the most common education level was “some college”, and the median annual family income was in the range US $50,000- $74,999. The framework is designed to collect a wide range of behavioral data from the user’s phone such as phone calls, text messages sent and received. The study also involved answering surveys related to health, well being and demographic data. METHODOLOGY Classification: To build and test a classification approach for cooperation propensities, we divided the risk scores based on the median value of the sample. To build the predictive models we first undertook feature selection based on robust subset selection. This method evaluates the worth of a subset of attributes by considering the individual predictive ability of each feature along with the degree of redundancy between them. These selected features were passed to different machine learning algorithms for classification and decided to adopt a 10-fold cross validation method to a tradeoff. During the process of model building, we explore a few visualization and metrics tools that help us on data preparation, model building and tuning and performance characterizing. MODELING RESULTS CONCLUSION Mobile cellular subscriptions have hit 6 billion throughout the world and carriers have increasingly made available phone logs to researchers as well as to their commercial partners . If predicted correctly, mobile phones datasets could thus provide a valuable unobtrusive and cost-effective alternative to survey based measures of personality. For example, marketing and phone companies might seek to access dispositional information about their customers to design customized offers and advertisements LIMITATIONS Although these approaches are interesting, they either require to have access to extensive information about people’s entire social network or people to install a specific tracking application on their phone. These constraints greatly undermine the use of such classification methods for large-scale investigations. Also multiple comparisons were undertaken in the correlation analysis. While such multiple comparisons are often “corrected” using Bonferroni or Bonferroni-Holm correction to maintain the confidence in the associations found, we do not do so in this work. This is because the analysis undertaken here is posthoc and intended to help interpret the observed prediction results rather than being prescriptive in its own right. REFERENCES 1. Cooperative Phoneotypes: Exploring Phone-based Behavioral Markers of Cooperation- Prof. Vivek Singh, Behaviroal Informatics Group, Rutges University . http://ubicomp.org/ubicomp2016/program/program.ph 2. Predicting Personality Using Novel Mobile Phone-Based Metrics Yves- Alexandre de Montjoye1,, Jordi Quoidbach2,∗, Florent Robic3,∗, and Alex (Sandy) Pentland1 3. MIT Human Dynamics Lab, Reality Commons, http://realitycommons.media.mit.edu/ 4. Cho, E., Myers, S. A., & Leskovec, J. (2011, August). Friendship and mobility: user movement in location- based social networks. In Proceedings of the 17th ACM SIGKDD international conference on Knowledge discovery and data mining (pp. 1082-1090). ACM. 5. 5Risk Propensity and Personality, Nigel Nicholson, Mark Fenton- O’Creevy , Emma Soane , Paul Willman The goal of this research is to show that users’ personalities can be reliably inferred from basic information accessible from all mobile phones and to all service providers. In other words, we address two fundamental questions: Which are the main emergent patterns of usage? To define a machine learning model to automatically infer an individual’s propensity to take risks. Specifically, we introduce following sets of psychology informed metrics–Social Activity Level, Engagement Ties Ratio, Mobility, Diurnal Ratio and Diversity and In-Out Ratio. Based on a 10-week field study involving 54 participants, we report that: (1) multiple phone-based signals were significantly associated with participant’s risk taking attitudes; and (2) combining phone-based signals yielded a classification predictive model with Accuracy of 0.72 that performed significantly better than a comparable demography-based model at predicting individual cooperation propensities. Rushil Goyal (under Prof. Vivek Singh, Behavioral Informatics Research Group Exploring Phone-Based Behavioral Markers of Risk Taking Attitude Regression- We undertook regression analysis with the risk score as a continuous dependent variable and the aforementioned socio- mobile variables as the input variables. Specifically, we tried different models. The demographic variables were also included onto the selected subset features to test the hypothesis about they improving the model. Lasso Regression and Wrapper Method were implemented to select optimal feature subset. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 x51 x21 x77 x24 x66 x52 x80 x88 x85 x69 x12 x50 x36 x90 x19 x25 x75 x35 x37 x57 x40 FEATURE INDEX Robust Feature Selection- Importance Plot Average all_methods Correlation Lasso Random Forest Recursive Feature Elimination Ridge Regression COMMERICIAL IMPLICATION Fig 6. Feature Importance - Classification Fig 4. Data Summary Fig 2. Broad Category of Features. Fig 5 Exploratory Analysis Fig 3. Meta-Data Summary Snapshot Fig 7. Decision Tree Model Fig. 8 Performance Evaluation Following information were collected from the participants for the ten week period: ● Communication log data: This included date and time of communication event, the type of communication (text/call), incoming or outgoing, duration ● Physical location: This included the location of the device using GPS and approximate location area based on the cell tower Although more research is needed to validate our model and the robustness of our indicators for use on a large-scale and more diverse population, we believe that our findings open the door to exciting avenues of research in social sciences. Our personality indicators and the ability to predict personality using readily available mobile phone data may enable cost-effective, questionnaire-free investigation of personality-related questions at the scale of entire countries. For example, such results could be used by an individual to identify the most cooperative peers for engaging in mobile commerce or by community designers to recruit suitable early volunteers. For future work, it is possible to further improve the model performance by fine tuning the model parameters or deeper understanding features. Fig 1. Rutgers Well Being App. Rsquared p_val index 0.206654411 0.006140066 15+19 0.274421906 0.002976239 13+15+19 0.3244694 0.002067336 6+9+15+19 0.381895644 0.001047517 6+9+15+17+19 0.416681726 0.000952634 9+14+15+16+17+19 0.441002964 0.001120881 5+9+14+15+16+17+19 0.464268863 0.001301668 2+5+9+14+15+16+17+19 0.471091875 0.00234983 2+5+9+11+14+15+16+17+19 0.477614896 0.004063538 2+5+6+7+9+14+15+16+17+19 0.494187662 0.005161415 2+4+6+7+8+9+14+15+16+17+19 0.511620546 0.006265241 2+3+4+6+7+8+9+14+15+16+17+19 0.53254726 0.006812313 2+3+4+6+7+8+9+13+14+15+16+17+19 0.543794763 0.009365572 2+3+4+5+6+7+8+9+13+14+15+16+17+19 0.552747265 0.013342508 2+3+4+5+6+7+8+9+13+14+15+16+17+18+19 0.554839459 0.021781009 2+3+4+5+6+7+8+9+13+14+15+16+17+18+19+20 0.555427596 0.035327953 2+3+4+5+6+7+8+9+10+13+14+15+16+17+18+19+20 Fig. 11 Feature Importance- RegressionFig. 10 Lasso Regression Fig. 12 Feature Selection: Brutal Force Wrapper Analysis Fig. 9 Fine Tuning Random Forest
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