The material for the research comprises the iambic trimeter of Greek lyrics, tragedy and comedy, the archaic and Hellenistic choliambus, the early Roman senarius and the trimeter of late Roman tragedy.
The metrical and rhythmical analysis focuses on the evolution of the ancient iambic trimeter from its earliest form Greek lyric trimeters to the late Latin tragical trimeter.
From the archaic Greek trimeter to the trimeter of the late Latin tragedy the rhythmical evolution of iambic trimeter demonstrates certain universal features which are especially characteristic to the verse of MS type (a metrical structure with the basic alphabet of two symbols, i.e.
Thus you may find tetrameter or trimeter, simply by counting stresses, but will not be able to determine the patterning described above.
You might also note that the middle three lines are quite strictly iambic, while the first and last are strongly anapestic, but drop the unstressed syllables in the last foot.
Note that the rhyme pattern follows the metrical pattern: the trimeter lines rhyme on the A word; the dimeter lines on the B word.