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Q&A
Council Member Won questions DOT's daylighting study methodology
1:30:35
·
51 sec
Council Member Julie Won challenges the methodology of DOT's daylighting study, questioning its sample size, selection criteria, and comparison methods. Deputy Commissioner Eric Beaton defends the study's robustness and statistical significance.
- Won raises concerns about the study being underpowered and potentially flawed
- Beaton explains the study covered all daylit intersections from 2019-2021 with three years of before and after data
- Discussion centers on the adequacy of sample size and comparison methods used in the study
Julie Won
1:30:35
DOT conducted a before and after analysis, but the execution of the analysis was deeply flawed.
1:30:41
The data looked at five sixty seven soft soft daylight intersections on a 89 hardened daylight intersections.
1:30:49
The latter then broke into five different subgroups of daylighting, some with only handful of samples which should say this study appears severely underpowered.
1:30:57
The before versus after data in these intersections was then contrasted with nearby control intersections with daylighting.
1:31:03
How was the minimum required sample size determined for this analysis and was the minimum met for all subgroups and groups?
1:31:10
What criteria were used to select these intersections?
1:31:13
Were there any efforts in comparing intersections with similar characteristics such as traffic volume, land use, traffic signals, signage, and intersection makeup?
1:31:23
I'm gonna ask another question since we're gonna be out of time.