river raises

Started a study of river raises and check/raises in fix limit.
Have inspected about 700 hands. 50 raises and check/raises
appeared in the sample. Only two were out and out bluffs.
Two were ill advised and a few were weaker than top pair top
kicker. On balanced the raises and c/r were solid. Four
of the raises lost and one split.
Have decided river LHS has little value for assisting on
decisions on whether to call or reraise. Need the nut hand
to reraise against most players. Calling with TPTK can only
beat a bluff.
Will repost on this subject when over 10,000 hands are
inspected.