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      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
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        <Desc>INTEREST RECEIVABLE</Desc>
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      <OtherAssetsOrgGrp>
        <Desc>RESTRICTED FUNDS</Desc>
        <BookValueAmt>819332</BookValueAmt>
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      <OtherAssetsOrgGrp>
        <Desc>CASH &amp; INVESTMENTS HELD FOR OTHERS</Desc>
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      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>4399149</TotalRevEtcAuditedFinclStmtAmt>
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      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
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        <FormAndLineReferenceDesc>PART IV, LINE 2B:</FormAndLineReferenceDesc>
        <ExplanationTxt>IN JANUARY 2017, IMS BEGAN ACTING AS FISCAL AGENT FOR ANOTHER ASSOCIATION, THE COMMITTEE OF PRESIDENTS OF STATISTICAL SOCIETIES (COPSS). AS PART OF THIS ARRANGEMENT, IMS HOLDS COPSS'S ASSETS AND MAKES TRANSACTIONS ON ITS BEHALF.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ENDOWMENT CONSISTS OF TWO DONOR-RESTRICTED ENDOWMENT FUNDS, THE LE CAM ENDOWMENT AND THE BLACKWELL LECTURE ENDOWMENT, ESTABLISHED IN ORDER TO FUND PROFESSIONAL LECTURES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE IS A SECTION 501(C)(3) ORGANIZATION EXEMPT FROM INCOME TAXES ON ACTIVITIES RELATED TO ITS EXEMPT PURPOSE UNDER SECTION 501(A) OF THE INTERNAL REVENUE CODE AND SECTION 23701D OF THE CALIFORNIA REVENUE AND TAXATION CODE. NO PROVISION FOR FEDERAL OR STATE INCOME TAXES HAS BEEN REPORTED IN ITS FINANCIAL STATEMENTS. INCOME TAXES ARE ACCOUNTED FOR UNDER THE PROVISIONS OF THE "INCOME TAXES" TOPIC OF THE FASB ASC. UNCERTAIN INCOME TAX POSITIONS ARE EVALUATED AT LEAST ANNUALLY BY MANAGEMENT. THE INSTITUTE CLASSIFIES INTEREST AND PENALTIES RELATED TO INCOME TAX MATTERS AS INCOME TAX EXPENSE IN THE ACCOMPANYING FINANCIAL STATEMENTS. AS OF DECEMBER 31, 2024 AND 2023, THE INSTITUTE HAS IDENTIFIED NO UNCERTAIN INCOME TAX POSITIONS AND HAS INCURRED NO AMOUNTS FOR INCOME TAX PENALTIES AND INTEREST FOR THE YEARS THEN ENDED. THE INSTITUTE FILES ITS FEDERAL FORM 990 IN THE U.S. FEDERAL JURISDICTION AND A STATE REGISTRATION AT THE OFFICE OF THE STATE'S ATTORNEY GENERAL FOR THE STATES OF OHIO AND CALIFORNIA.</ExplanationTxt>
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        <RegionTxt>EUROPE</RegionTxt>
        <TypeOfActivitiesConductedTxt>PROGRAM SERVICE</TypeOfActivitiesConductedTxt>
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      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
      <ContinuationTotalOfficeCnt>0</ContinuationTotalOfficeCnt>
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      <TotalOfficeCnt>0</TotalOfficeCnt>
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      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>96456</TotalSpentAmt>
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      <InterestInForeignTrustInd>0</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>0</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>0</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>0</ForeignPartnershipInd>
      <BoycottCountriesInd>0</BoycottCountriesInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 3:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXPENDITURES ARE REPORTED BASED ON THE ACCRUAL METHOD OF ACCOUNTING, WHICH IS THE SAME AS THE FINANCIAL STATEMENTS.</ExplanationTxt>
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    </IRS990ScheduleF>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
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        <GrantTypeTxt>IMS TRAVEL GRANTS</GrantTypeTxt>
        <RecipientCnt>73</RecipientCnt>
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        <ValuationMethodUsedDesc>FMV</ValuationMethodUsedDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>CONFIRMING ATTENDANCE AT ANNUAL MEETING.</ExplanationTxt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS ELECT THE PRESIDENT AND COUNCIL MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS VOTE ON THE INSTITUTE OF MATHEMATICAL STATISTICS PRESIDENT AND THE INSTITUTE OF MATHEMATICAL STATISTICS 15 ELECTED COUNCIL MEMBERS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>ANY CHANGES TO THE CONSTITUTION OR BYLAWS MUST BE APPROVED BY THE IMS MEMBERSHIP.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>A DRAFT OF THE FORM 990 WAS DISTRIBUTED TO THE GOVERNING BODY FOR REVIEW AND COMMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE IMS HAS A CONFLICT OF INTEREST POLICY WHICH IS POSTED ON THE WEBSITE FOR PUBLIC REVIEW IN THE HANDBOOK OF THE IMS. NEW MEMBERS IN LEADERSHIP ARE DIRECTED TO REVIEW EACH PART OF THIS HANDBOOK. COMPLIANCE IS REVIEWED BY THE EXECUTIVE DIRECTOR AND MONITORED BY THE EXECUTIVE COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ANNUAL REVIEW OF THE EXECUTIVE DIRECTOR INCLUDES INPUT FROM EDITORS, COMMITTEE CHAIRS AND THE EXECUTIVE COMMITTEE. A SALARY SURVEY OF COMPARABLE PERSONNEL IN THE AREA IS USED TO EVALUATE THE APPROPRIATENESS OF COMPENSATION IN THE FIELD. FINAL APPROVAL OF THE COMPENSATION MUST BE APPROVED BY THE FULL EXECUTIVE COMMITTEE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THEY ARE DISCLOSED ON IMS'S WEBSITE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
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</Return>