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Toolkit for Quantitative Methods Research

by: Russ Witting

Toolkit for Quantitative Methods Research EDUC 231A

Russ Witting
GPA 3.55


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This 16 page Class Notes was uploaded by Russ Witting on Friday September 4, 2015. The Class Notes belongs to EDUC 231A at University of California - Los Angeles taught by Staff in Fall. Since its upload, it has received 90 views. For similar materials see /class/178011/educ-231a-university-of-california-los-angeles in Education and Teacher Studies at University of California - Los Angeles.

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Date Created: 09/04/15
Mews Modeling with a preponderance of zeros Frauke Kreuter UCLA Statistics Nata Characteristics mmemmmmmiam Skewed Examples Convictions DnnMng Drug abuse Frequency 300 200 100 I 0 total I 20 KClassic examples Manufacturing applications Economics Medicine Public health Environmental science Education Nistributions Skewed Log transformed KModeling strategies Continuous Counts Censored normal Twopart modeling Twopart model Zero inflated models Mixture models Mixture models Zero inflated models Zero inflated models Twoclass model Twoclass model News in longitudinal data Onset W Zero until onset Once behavior shown we want to model counts Offset Zero after a certain point Eg abstinence jail time I I I I I I I I I I I I I I I 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 age Zeros in longitudinal data 2 3 I I number of convict ions 1 39 I Criminal careers In and out of zero random zeros Example Solid line Respondent 1 I Measurement errors Zero throughout 39a partly structural zeros Here 60 0 age1040 I I I I l I l I I I I I I I I I 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 age Separate process for zeros OkExample Olsen amp Schafer 2001 Data 1961 Model twoparts Panel ofAdolescent Upart Prevention Trial Logit Middle school and high use nouse school students Grade 7 trough 11 I Ypart Lognormal Variables ygt0 Self reported recent alcohol use Parental monitoring rebelliousness gender mit 770139 771ial39t 811 10 Maw data Grade Grade Grade Grade Grade I 7 8 9 1 0 1 1 1 0 0 0 0 0 2 0 0 1 7 23 3 3 0 1 0 1 1 7 11 New Grade Grade Grade Grade Grade I 7 8 9 1 0 1 1 1 0 0 0 0 0 2 0 0 1 1 1 3 0 1 0 1 1 12 Npart Grade Grade Grade Grade Grade I 7 8 9 1 0 1 1 1 2 1 7 2 3 3 3 1 1 1 7 13 Nwo part modeling Mpus DMDDEIH iu su l ulO u2l u32 u43 iu sy on x suO syO iu with suO iy with syO iu with syO su with iy sy0 OkExample Olsen amp Schafer 2001 Upart In grade 7 unsupervised girls higher odds for drinking effect diminishes over time Low monitoring in grade 7 no effect for boys but unsupervised boys higher odds in grade 11 Ypart Reduced monitoring increase the amount of alcohol consumption in grade 7 For girls effect increases over time for boys it vanishes by grade 11 15


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