THE SEROTONIN HYPOTHESIS OF MAJOR DEPRESSION
The somatic marker hypothesis ..
For example, let us say that we wanted to test the 5-HIAA (a serotonergic metabolite) levels in the cerebrospinal fluid (CSF) of depressed individuals.
The findings supported the mood maintenance hypothesis in ..
This is a test of independent samples. The measurements may be continuous data, but the underlying distribution is either unknown, or known to be non-normal. In either case, the data can be ranked and analyzed without the constraint of having to assume a known population distribution.
Example: Three different plants manufactured the same garment style. Variation in garment length was a customer concern. Length was measured to the nearest 1/4″. Within each plant, only four measurement increment values were obtained. This lack of measurement sensitivity indicated that ranking the data was preferred to assuming normality. The null hypothesis is that the population medians are the same. Ho: M1 = M2 =… = Mn. The following table shows data coded as deviations from a common reference value.