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        "datetime_modified":"20260107T161642",
        "datetime_start":"20260128T120000",
        "datetime_end":"20260128T130000",
        "has_end_time":1,
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        "time_start":"12:00:00",
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        "event_title":"MPSDS \/ JPSM Seminar Series:  Sensitivity Analyses for Nonignorable Selection Bias When Estimating Subgroup Parameters in Nonprobability Samples: A Weighting Approach",
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        "combined_title":"MPSDS \/ JPSM Seminar Series:  Sensitivity Analyses for Nonignorable Selection Bias When Estimating Subgroup Parameters in Nonprobability Samples: A Weighting Approach: Rebecca R. Andridge - The Ohio State University",
        "event_subtitle":"Rebecca R. Andridge - The Ohio State University",
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        "description":"MPSDS \/ JPSM Seminar Series\r\nMPSDS M3 Series: Mastery, Methodology, Meetups\r\n\r\nIn person, room 1070 Institute for Social Research, and via Zoom. \r\nThe Zoom call will be locked 10 minutes after the start of the presentation.\r\n\r\nSensitivity Analyses for Nonignorable Selection Bias When Estimating Subgroup Parameters in Nonprobability Samples: A Weighting Approach\r\n\r\nSelection bias in survey estimates is a major concern, affecting both nonprobability samples and probability samples with low response rates. The proxy-pattern mixture model (PPMM) offers a method for conducting a sensitivity that assumes a nonignorable selection mechanism, where selection depends on survey outcomes of interest. This approach requires summary-level auxiliary information for the target population of interest from a reference data source. While PPMM methods have been successfully applied to derive overall population-level estimates, extension to domain-level estimates is challenging when population-level summaries for the specific subgroup are unavailable. This occurs when the domain indicator is observed only in the survey, or for complex intersectional subgroups where stable\/reliable population-level auxiliary variable estimates are unavailable. To combat this issue, we propose a novel approach: creating nonignorable selection weights based on the PPMM based on a re-expression of the PPMM as a selection model. These weights can be directly applied to calculate domain-level estimates, circumventing the need for domain-specific population-level summaries of auxiliary variables. They rely on a single sensitivity parameter (ranging from 0 to 1) that captures a spectrum of nonresponse assumptions, ranging from an ignorable mechanism to an extreme nonignorable mechanism. We discuss differences in weight construction for continuous versus binary outcomes, describe the necessary assumptions for these weights to produce informative domain-level estimates, and illustrate properties through simulation. We then apply the approach to the Census Household Pulse Survey to estimate various subgroup quantities under a range of assumptions on the selection mechanism.\r\n\r\nRebecca R. Andridge, PhD\r\nThe Ohio State University\r\nCollege of Public Health, Division of Biostatistics\r\nAssociate Dean for Undergraduate Studies\r\nProfessor of Biostatistics\r\n\r\nDr. Andridge's research is focused on imputation methods for missing data, primarily when missingness is driven by the missing values themselves (missing not at random), and on measures of selection bias for nonprobability samples. She also works on statistical challenges that arise in analysis of data from group-randomized trials. She collaborates with researchers across campus, including the Institute for Behavioral Medicine Research, the Nisonger Center for Excellence in Developmental Disabilities, and The OSU Comprehensive Cancer Center, and serves as Lead Methodologist for several state-sponsored population-based surveys. She is an Elected Fellow of the American Statistical Association (2020).",
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        "event_title":"Power and Partnerships in Community Engagement",
        "occurrence_title":"",
        "combined_title":"Power and Partnerships in Community Engagement: A Part of Ginsberg Center\u2019s Community Engagement @ Michigan Series",
        "event_subtitle":"A Part of Ginsberg Center\u2019s Community Engagement @ Michigan Series",
        "event_type":"Workshop \/ Seminar",
        "event_type_id":"21",
        "description":"Developing equitable and mutually beneficial partnerships with community members and organizations requires taking a critical look at how power operates in university-community partnerships. This interactive workshop will introduce participants to key principles of equity-focused community engagement and discuss how relationships of power shape university-community partnerships for research and student learning. We\u2019ll consider how power operates in such areas as: the structure and terms of partnership agreements, participation dynamics in university-community projects, and funding\/compensation. Participants will generate strategies for re-shaping inequitable power dynamics, share insights with colleagues, and identify ways to apply key principles to their own community-engaged work. \r\n\r\nThis session is designed especially for participants who are involved in (or interested in) community-engaged research, teaching & learning, project\/program administration, and\/or campus initiatives at Michigan. \r\n\r\nOpen to faculty, staff, admin, and post-docs. Graduate students who are interested in attending can email ginsberginfo@umich.edu for more information.\r\n\r\nThis session is not open to undergraduate students.\r\n\r\nRegister: https:\/\/sessions.studentlife.umich.edu\/track\/event\/session\/104215",
        "occurrence_notes":"Register via Sessions to receive Zoom information",
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        "tags":["Advocacy","Community Engagement","Community Organzing","Faculty","Free","Staff","Workshop"],
        "website":"https:\/\/sessions.studentlife.umich.edu\/track\/event\/session\/104215",
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        "time_zone":"America\/Detroit",
        "event_title":"Resume Lab",
        "occurrence_title":"",
        "combined_title":"Resume Lab",
        "event_subtitle":"",
        "event_type":"Careers \/ Jobs",
        "event_type_id":"2",
        "description":"*RSVP required to attend. Click \"Join Event\" here:\u00a0https:\/\/umich.joinhandshake.com\/edu\/events\/1878444Just getting started building a resume? Have a draft but not sure how to make it better? Want to learn about resources available to revise your resume? Wherever you\u2019re at Resume Lab is a great next step for you.\u00a0Get real-time, personalized support in a small group setting by checking out the Resume Lab.We will discuss and educate you on\u2026- Design andformat- Writing a great bullet point- Targeting your resumefor specific internships\/jobs\u00a0If you're a Graduate Studentor Recent Grad, please make a 1:1 appointment instead of attending the Lab because this event is designed for undergraduates.\u00a0Note:This event's information is shown in Handshake as well as on the Happening @ Michigan calendar so that it will be seen by a larger number of U-M Students.#UCC",
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        "event_title":"Revolutionary Paine: Andy Murphy Student-Curated Class Exhibit Common Sense",
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        "combined_title":"Revolutionary Paine: Andy Murphy Student-Curated Class Exhibit Common Sense",
        "event_subtitle":"",
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        "description":"Thomas Paine\u2019s \u201cCommon Sense\u201d was one of the most influential works of the American Revolution. The first edition was published on January 10, 1776, with an initial print run of just 1,000 copies; but within weeks demand soared. The students of Andy Murphy\u2019s POLISCI 495 course co-curated the exhibition \u201cRevolutionary Paine\u201d to document the whirlwind caused by its publication. On view at the Clements January 16-May 8, weekdays from 12-4 pm.",
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        "room":"Avenir Foundation Reading Room",
        "location_name":"William Clements Library",
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        "tags":["Americana","Exhibit","Exhibition","history"],
        "website":"https:\/\/clements.umich.edu\/exhibit\/revolutionary-paine\/",
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        "event_title":"SPH Leadership Development Series 2025-26",
        "occurrence_title":"Leading With Intelligence: Harnessing the Power of AI",
        "combined_title":"SPH Leadership Development Series 2025-26: Leading With Intelligence: Harnessing the Power of AI",
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        "event_title":"Take a Survey, Take a Slice",
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        "description":"Join us on the 8th floor of Weiser Hall from 12\u20132 PM on Wednesday, February 4th, and Friday, February 6th for FREE PIZZA in exchange for completing a leadership survey.\n\nYour input helps the Barger Leadership Institute and other campus organizations better understand how to offer meaningful leadership opportunities. The survey is run by CELO (Center for Expanding Leadership and Opportunities), one of the world\u2019s largest and longest-running youth leadership research programs, and your data is fully anonymous and securely stored.\n\nCheck your email from MSL (Jan 12) for the survey link\nNo email? We will share a link with you to use at the event!\n\nWhat you\u2019ll be asked about:\n-> Leadership experiences in and out of the classroom\n-> Campus involvement & sense of belonging\n-> Skills, values, and perspectives you\u2019ve developed at U-M\n\nThe details:\n-> An online survey that takes about 20 minutes\n-> Participation is completely voluntary\n-> Must be a current U-M undergraduate and 18+ to participate",
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