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Event sampling methodology (ESM), also known as ecological momentary assessment or experience sampling methodology, refers to sampling methods that allow researchers to study ongoing experiences and events by taking assessments one or more times per day in the naturally-occurring environment.〔Reis, H. T., & Gable, S. L. (2000). Event-sampling and other methods for studying everyday experience. In H. T. Reis, C. M. Judd, H. T. Reis, C. M. Judd (Eds.), ''Handbook of research methods in social and personality psychology'' (pp. 190-222). New York, NY US: Cambridge University Press.〕 ESM has several purposes: to get an understanding of the prevalence of behaviors, promote theory development, and to serve an exploratory role. Because of the frequent sampling of events inherent in ESM, it enables researchers to measure the typology of activity and detect the temporal and dynamic fluctuations of work experiences. Popularity of ESM as a new form of research design increased over the recent years because it addresses the shortcomings of cross-sectional research, where once unable to, researchers can now detect intra-individual variances across time. In ESM, participants are asked to record their experiences and perceptions in a paper or electronic diary. Diary studies allow for the studying of events that occur naturally but are difficult to examine in the lab. There are three types of ESM procedures: # Signal contingent – some form of notification, such as beeping from a pager or wristwatch notifies participants to record data at either fixed or random intervals.〔 The advantage of this type of ESM is minimization of recall bias. # Event contingent – participant records any occurrence of certain pre-determined events. This form is most useful when the event is fairly infrequent. It also allows flexibility for tracking events that typically fluctuate on their own. Clear definition(s) for the events of interest are important for not distorting the frequency and allowing the participant to make an easy distinction as to whether or not the event has occurred.〔 # Interval contingent – records data according to the passing of a certain period of time. Typically, participants are asked to self-report on the behavior of interest at pre-determined intervals〔Scollon, C., Kim-Prieto, C., & Diener, E. (2003). Experience sampling: Promises and pitfalls, strengths and weaknesses. ''Journal Of Happiness Studies, 4''(1), 5-34.〕 which are determined on the basis of either theoretical or logical units of time. The selection of the interval itself is crucial for not leading to skewed perception of the behavior, but it also is important that it is not taxing on the participants.〔Bolger, N., Davis, A., & Rafaeli, E. (2003). Diary methods: Capturing life as it is lived. ''Annual Review Of Psychology, 54,'' 579-616.〕 A day is the most commonly used sampling unit.〔 There are many strengths to using ESM. The first is that it highlights the possible situations and roles that behavior may be contingent upon. That is, it serves as a demonstration of the interaction between the person and the context and provides insight to the contingencies of behavior.〔 A second strength of ESM is that it provides ecological validity because the data is collected in the participant’s natural environment, and this allows greater generalizability of the resulting data. Another strength is that it provides an excellent tool to measure individual differences and the differences the emerge or change over time. The fact that ESM avoid some of the typical problems of ESM is a fourth strength. With typical self-report measures, there can be concerns with memory or recall bias where participants may have difficulty recalling the past. A final strength of ESM is that is serves as a demonstration of the usefulness of multi methods assessment. The results and application of ESM are most useful when they are used in combination with global reports, for instance.〔 ESM has several disadvantages. One of the disadvantages of ESM is it can sometimes be perceived as invasive and intrusive by participants. ESM also leads to possible self-selection bias. It may be that only certain types of individuals are willing to participate in this type of study creating an unrepresentative sample. Another concern is related to participant cooperation. Participants may not be actually fill out their diaries at the specified times and concern has been raised difference in diary format may be influential in compliance.〔Green, A. S., Rafaeli, E., Bolger, N., Shrout, P. E., & Reis, H. T. (2006). Paper or plastic? Data equivalence in paper and electronic diaries. ''Psychological Methods, 11''(1), 87-105.〕 However recent research〔 found that research that focuses on mean levels, between-person differences, and correlations among variables are less likely to be impacted by the difference between electronic and paper diary methods. Further concerns are related to the fact that ESM may substantively change the phenomenon being studied. Reactivity or priming effects may occur, such that repeated measurement may cause changes in the participants' experiences. This method of sampling data is also highly vulnerable to common method variance. Further, it is important to think about whether or not an appropriate dependent variable is being used in an ESM design. For example, it might be logical to use ESM in order to answer research questions which involve dependent variables with a great deal of variation throughout the day. Thus, variables such as change in mood, change in stress level, or the immediate impact of particular events may be best studied using ESM methodology. However, it is not likely that utilizing ESM will yield meaningful predictions when measuring someone performing a repetitive task throughout the day or when outcomes are long-term in nature (e.g., coronary heart problems). The possible techniques for analyzing data from ESM are important to consider. ESM produces a large amount of data which is one issue, but there are also considerations to factor into the analysis decision such as nesting, serial dependence, and an imbalance in the number and variance of data points.〔 Options range from calculating composites, using regression analyses, or modeling through multilevel or hierarchically nested models.〔 The most frequently used multilevel modeling options for diary data include〔 Hierarchical Linear Modeling (HLM) software〔Bryk A.S.,& Raudenbush S.W., Congdon RT. 1996. ''HLM: Hierarchical Linear and Nonlinear Modeling with the HLM/2L and HLM/3L Programs.'' Chicago: Scientific Software Int.〕 and MLWin.〔Prosser R, Rasbash J, Goldstein H. 1996. ''MLn User’s Guide.'' London: Inst. Educ.〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Event sampling methodology」の詳細全文を読む スポンサード リンク
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