CJUS - P100 Lecture Notes

CJUS - P100 Lecture Notes - February12,2009 Recap:

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February 12, 2009 Recap: Both the NCVS and the s-r tap into the “dark figure of crime” Not dependent on CH records like official data No problem with case attrition and procedural bias S-r vs. NCVS questions a.1. Long recall period (lifetime) a.2. Emphasized trivial offenses Strengths and Weaknesses of S-R: Strengths: Focuses on wider variety of crimes NCVS – UCR Part I S-R – serious, moderate, trivial and victimless crimes Characteristics of offender beyond sex and race Weaknesses Recall period
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S-R – past year? NCVS – past 6 months? Social desirability Comparing 3 Measures of Crime: Which is Better? Reliability a.A. Definition a.B. Examples Validity a.A. Content Validity a.A.1. Definition a.A.2. Examples a.B. Criterion Validity a.B.1. Definition a.B.2. Example Comparing the Measures of Crime: Which is better? No measure of crime is perfect Each has different strengths and weaknesses Each gives a different perspective on the “true level of crime”
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How to judge which is better (accurate measurement)… technical language: Reliability Validity Content validity Criterion validity What is reliability? Reliability = consistent results “you get the same results with repeated measurements” Example #1: check air in tires with air gauge Example #2: camera vs draw a picture Example #3: weigh yourself on a scale KEY POINT: reliability doesn’t guarantee accurate measurement Reliability Alone is not Enough Two additional technical terms Content validity Definition: “If the concept refers to a wide  range of behavior, then your  measurement should tap into that same range of behavior.” EXAMPLE #1: elementary school math aptitude. Divide, multiply, add, subtract, fractions
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17 February, 2009 Recap : Comparing three measures of crime Each have different strengths/weaknesses Each have different perspective on crime 2 technical terms reliability validity content validity  criterion validity Reliability Alone is Not Enough Con’t.  Content validity EXAMPLE #2: IQ test   intelligence???  SAT – range of different questions (math, English, writing) EXAMPLE #3: 3 different measures of crime UCR NCVS Self-report surveys
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UCR  ------------------------------------||------------------------------------------- very serious                                                                            very minor murder                DUI, pub intox Part I (8)                Part II NCVS      (6/8)  || Self report   entire scale Second Technical term: Criterion Validity Definition: “comparing one measure with other measures to see if they follow a 
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This note was uploaded on 02/25/2012 for the course CJ 3323 taught by Professor Mijares during the Fall '10 term at Texas State.

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CJUS - P100 Lecture Notes - February12,2009 Recap:

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