# \#drop-treatment-arm

**URL:** https://discourse.datamethods.org/tag/drop-treatment-arm/144.md

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## [Type I error in a specific design of 2-parallel group study](https://discourse.datamethods.org/t/type-i-error-in-a-specific-design-of-2-parallel-group-study/3051)

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**Author:** [@BertrandBio](https://discourse.datamethods.org/u/BertrandBio)\
**Replies:** 3\
**Last updated:** [March 11, 2020, 3:35pm UTC](https://discourse.datamethods.org/t/type-i-error-in-a-specific-design-of-2-parallel-group-study/3051 "2020-03-11T15:35:07Z")

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Hello, There’s this clinical trial where the study drug was tested with the following scheme: 1 substudy where the study drug was compared to a placebo comparator (both flat-dosed), & another substudy within the same tr…