So you can now understand what is a part per million. ppm in this context probably means parts per million. This is the concentration of a chemical or element in something like food or drink. for example 8 milligrams of mercury in 100 grams of fish would result in a mercury concentration of 0.8 ppm (parts per million)
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(See Random Effects .) Such models are also called variance component models. Random effect models are often hierarchical models. A model that contains both fixed and random effects is called a mixed model. Repeated measures and split-plot models are special cases of mixed models.Often the term mixed model is used to subsume random effect models.o specify a random effect, highlight it in the Construct Model Effects list and select. This appends &Random to the effect name in the model effect list. (For a definition of random effects, see Random Effects .) Random effects can also be specified in a separate effects tab.