The best replacement for observational is experimental.

The best alternatives to observational are rated as following:
★★★★★  experimental
★★  experimental study
★★  experimental data
★★  experimental studies
★  experimental research
★  experimental design
★  randomized
★  controlled experiment
★  experimental statistics
  randomized trial

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Google Trends

Scale is based on the average worldwide traffic of observational in all years. Click on graph for more.
observational
experimental
experimental study