Only One Cluster Per Condition is an Invalid Design for a Cluster Randomized Trial and Should Be Re-Labeled a Quasi-Experimental Study. Response To: “effect of Behavioral Activation on Time and Frequency Domain Heart Rate Variability in Older Adults with Subthreshold Depression: a Cluster Randomized Controlled Trial in Thailand”
BMC Psychiatry（2023）
Key words
Cluster randomized trial,Degrees of freedom,Inferential testing,Nesting
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