satunnaistamismenetelmä

Satunnaistamismenetelmä, also known as randomization method, refers to a systematic process of assigning subjects or units to different treatment groups or experimental conditions in a way that eliminates bias. The core principle is that each subject has an equal and independent chance of being assigned to any given group. This ensures that any observed differences between groups are likely due to the intervention being studied rather than pre-existing characteristics of the subjects.

There are several common randomization techniques. Simple randomization involves assigning subjects one by one using a random number generator or coin flip. Block randomization is used to ensure an equal or near-equal number of subjects in each group over time, often employed when recruitment is sequential. Stratified randomization is applied when certain baseline characteristics (strata) are known to influence the outcome. Subjects are first divided into strata based on these characteristics, and then randomization occurs independently within each stratum.

The primary goal of satunnaistamismenetelmä is to create comparable groups at the start of a study. By minimizing selection bias and confounding variables, randomization enhances the internal validity of research, allowing for stronger causal inferences. It is a fundamental tool in clinical trials, agricultural experiments, and many other scientific disciplines where unbiased comparison is crucial for drawing reliable conclusions. The integrity of the randomization process is paramount and often requires careful planning and execution to prevent breaches.