Examining Best Practices for Sampling and Weighting Dual ...
Examining Best Practices for Sampling and Weighting Dual Frame Surveys Liz Kantor Advised by Dr. David Redlawsk Rutgers, The State University of New Jersey PANJAAPOR 2015 Spring Event We know we need to include cell phones in telephone RDD samples and weight accordingly but we dont agree on how PANJAAPOR 2015 Spring Event Considerations Sampling What % of the sample
should be cell phones? Landlines? Weighting Base weight? Frame overlap adjustment? PANJAAPOR 2015 Spring Event Calibration adjustments? Trimming? Low variance! Data and Methods Data Rutgers-Eagleton Poll Methods Demographics: Chi-square Sampling analysis: weight C & LL samples
to make up varying proportions of overall sample Weighting: 17 weighting & trimming combinations PANJAAPOR 2015 Spring Event Weight Calculations Base weight: sample selection probability multiplied by household selection probability Frame adjustment: Compositing, Effective Sample Size PANJAAPOR 2015 Spring Event From Kennedy (2012) Weight Calculations Calibration
Basic Sample Balancing one manual iteration of each demographic variable Raking multiple iterations of each demographic variable; SPSSINC RAKE Extension Trimming Hard cap: .2 and 5 Percentile cap: 2nd and 98th percentiles PANJAAPOR 2015 Spring Event Weighting Combinations Taking a cue from Kennedy (2012): COMBINATION 0 A B C D E
F G H I J K L M N O P BASE WEIGHT? No Yes Yes Yes Yes Yes Yes Yes
Yes No No No No No No No No PANJAAPOR 2015 Spring Event FRAME OVERLAP N/A 1/2 Compositing 1/2 Compositing 1/2 Compositing 1/2 Compositing Effective Sample Size Effective Sample Size
Effective Sample Size Effective Sample Size 1/2 Compositing 1/2 Compositing 1/2 Compositing 1/2 Compositing Effective Sample Size Effective Sample Size Effective Sample Size Effective Sample Size CALIBRATION TRIMMING METHOD Basic Sample Balancing Hard Cap, .3 & 3 Basic Sample Balancing Hard Cap Basic Sample Balancing Percentile Cap Raking Hard Cap
Raking Percentile Cap Basic Sample Balancing Hard Cap Basic Sample Balancing Percentile Cap Raking Hard Cap Raking Percentile Cap Basic Sample Balancing Hard Cap Basic Sample Balancing Percentile Cap Raking Hard Cap Raking Percentile Cap Basic Sample Balancing Hard Cap Basic Sample Balancing
Percentile Cap Raking Hard Cap Raking Percentile Cap *0 = Rutgers-Eagleton Poll practices at the time of research Hypotheses I. Cell-only respondents will follow patterns in the literature of demographic distinctiveness and geographic mobility II. Dual users from the cell frame will differ demographically from dual users from the landline frame III. A higher % of cell phones than used in the Rutgers-Eagleton Poll will be required in the sample to match NHIS PANJAAPOR 2015 Spring
Eventestimates Hypotheses IV. Half compositing will be less efficient (higher DEFF) than effective sample size V. No difference in efficiency between hard cap and percentile cap; cant know a priori which will increase variance more PANJAAPOR 2015 Spring Event Demographics Statistically significant differences at = .001 C Only vs. Dual Dual from cell Gender Age Race
Party ID Educatio n Income PANJAAPOR 2015 Spring Event vs. LL only vs. Dual from LL
* * = .01 Demographics Differences in gender composition Rutgers-Eagleton Poll PANJAAPOR 2015 Spring Event Geographic Mobility Match between FIPS code (county) from sample provider and from respondent Rutgers-Eagleton Poll PANJAAPOR 2015 Spring Event
Simulated Sample Composition CELLLANDLIN CELL- MOSTL DUAL ELANDLIN ONLY Y USE MOSTLY E-ONLY NHIS (NJ) 19.4% 30% C 70% LL 10.4% 40% C 60% LL 13.9% 50% C
50% LL 17.4% 60% C 40% LL2015 Spring 20.8% PANJAAPOR 70% C Event 25.7% 31.1% 15.2% 6.9% 33.7%
34.8% 24.1% Rutgers-Eagleton Poll 16.9% 3.4% Design Effects Rutgers-Eagleton Poll PANJAAPOR 2015 Spring Event Margins of Error Rutgers-Eagleton Poll
*Calculated using Langer Research Associates MoE Machine PANJAAPOR 2015 Spring Event Average deviation from NHIS estimates Rutgers-Eagleton Poll NHIS (NJ) CELLCELLONLY MOSTLY 19.4% 25.7% PANJAAPOR 2015 Spring Event DUAL LANDLINE LANDLINE USE
-MOSTLY -ONLY 31.1% 15.2% 6.9% * indicates that the weighting combination came within 1% of the cell-only estimate Discussion Support for Hypotheses I, II, and III: Significant demographic differences among cell only, dual users, and landline only Estimated geographic mobility much greater for Rs from cell sample vs. Rs from landline sample Significant demographic differences
between dual users from cell and landline samples More PANJAAPOR 2015cell Springphone interviews (~50%) are Event Discussion No support for Hypothesis IV Compositing was not less efficient than Effective Sample Size Little support for Hypothesis V Percentage cap was more efficient than the hard cap PANJAAPOR 2015 Spring Event Weighting
Recommendations Ultimately, no obvious best practices Criteria for choosing weighting and trimming combinations: Includes a frame adjustment (avoid biased estimators) Inclusion of base weight Brings percentage of cell-only respondents within 1% of NHIS estimates Percentile cap more efficient PANJAAPOR 2015 Spring Event Weighting Recommendations Under these criteria, good weighting and trimming combinations are: B: Base Weight, Compositing, Basic
Sample Balancing, Percentile Cap D: Base Weight, Compositing, Raking, Percentile Cap F: Base Weight, Effective Sample Size, Basic Sample Balancing, Percentile Cap PANJAAPOR 2015 Spring Event Future Research Replicate using other data Strengthen the theoretical basis of the criteria used to recommend weighting combinations Experiment with more aggressive percentile caps (e.g. 5% and 95%) PANJAAPOR 2015 Spring Event Thank You [email protected]
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