**Exhibit 31.1****CERTIFICATION**I, Stephen B. Morris, President and Chief Executive Officer of Arbitron Inc., certify that:1. I have reviewed this annual report on Form 10-K of Arbitron Inc.; 2. Based on my knowledge, this report does not contain any untrue statement of a materialfact or omit to state a material fact necessary to make the statements made, in light ofthe circumstances under which such statements were made, not misleading with respect to theperiod covered by this report; 3. Based on my knowledge, the financial statements, and other financial informationincluded in this report, fairly present in all material respects the financial condition,results of operations and cash flows of the registrant as of, and for, the periodspresented in this report; 4. The registrant’s other certifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e)and 15d-15(e)) and internal control over financial reporting (as defined in Exchange ActRules 13a-15(f) and 15d-15(f)) for the registrant and have: (a) Designed such disclosure controls andprocedures, or caused such disclosure controls and procedures to bedesigned under our supervision, to ensure that material informationrelating to the registrant, including its consolidated subsidiaries,is made known to us by others within those entities, particularlyduring the period in which this report is being prepared;  (b) Designed such internal control overfinancial reporting, or caused such internal control over financialreporting to be designed under our supervision, to providereasonable assurance regarding the reliability of financialreporting and the preparation of financial statements for externalpurposes in accordance with generally accepted accountingprinciples;  (c) Evaluated the effectiveness of theregistrant’s disclosure controls and procedures and presented inthis report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the periodcovered by this report based on such evaluation; and  (d) Disclosed in this report any change inthe registrant’s internal control over financial reporting thatoccurred during the registrant’s most recent fiscal quarter (theregistrant’s fourth fiscal quarter in the case of an annual report)that has materially affected, or is reasonably likely to materiallyaffect, the registrant’s internal control over financial reporting;and5. The registrant’s other certifying officer(s) and I have disclosed, based on our mostrecent evaluation of internal control over financial reporting, to the registrant’sauditors and the audit committee of the registrant’s board of directors (or personsperforming the equivalent functions): (a) All significant deficiencies and materialweaknesses in the design or operation of internal control overfinancial reporting which are reasonably likely to adversely affectthe registrant’s ability to record, process, summarize and reportfinancial information; and  (b) Any fraud, whether or not material, thatinvolves management or other employees who have a significant rolein the registrant’s internal control over financial reporting.     Date: February 27, 2007 /s/ Stephen B. Morris         Stephen B. Morris    President and Chief Executive Officer