The best replacement for experimental studies is observational studies.

The best alternatives to experimental studies are rated as following:
★★★★★  observational studies
★★★  correlational studies
★★  observational
★  correlation studies
★  non experimental studies
★  studies
★  correlational

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Google Trends

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