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The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification. Also propensity scores may be used for matching or as covariates—alone or with other matching variables or covariates. Distinctions include such production alternatives as for consumption food, haircuts, etc. Matching attempts to mimic randomization by creating a sample of units that received the treatment that is comparable on all observed covariates to a sample of units that did not receive the treatment.
These have no periodic order, even microscopically. Also, recorded or unrecorded factors may be correlated which may yield incorrect conclusions.
