Jonabob87 said:
http://women.timesonline.co.uk/tol/life_and_style/women/families/article6974059.ece One that states the opposite, although I stick with my belief that different methods work for different children.
The problem is, that study lacks the scope of the ones I linked earlier. It's interesting, but I don't think you can take much from it. I'll take the word of:
The American Psychological Association claims that corporal punishment is violent and unnecessary, may lower self-esteem, and is liable to instill hostility and rage without reducing the undesired behavior.
The Royal College of Pediatrics and Child Health and the Royal College of Psychiatrists have both called for a complete ban on all corporal punishment, stating, "We believe it is both wrong and impracticable to seek to define acceptable forms of corporal punishment of children. Such an exercise is unjust. Hitting children is a lesson in bad behavior". And that "it is never appropriate to hit or beat children".
The Australian Psychological Society holds that physical punishment of children should not be used as it has very limited capacity to deter unwanted behavior, does not teach alternative desirable behavior, often promotes further undesirable behaviors such as defiance and attachment to "delinquent" peer groups, and encourages an acceptance of aggression and violence as acceptable responses to conflicts and problems.
A 2003 review of available research into parental punishment concluded, "Strong evidence exists that the use of physical punishment has a number of inherent risks regarding the physical and mental health and well-being of children".
http://www.jpedhc.org/article/S0891-5245%2802%2988318-3/abstract
A 2008 study published in the American Journal of Preventive Medicine found that mothers who reported spanking their children were more likely (6% vs 2%) to also report using forms of punishment considered abusive to the researchers "such as beating, burning, kicking, hitting with an object somewhere other than the buttocks, or shaking a child less than 2 years old" than mothers who did not report spanking, and increases in the frequency of spanking were statistically correlated with increased odds of abuse.
http://www.ajpm-online.net/article/S0749-3797%2808%2900600-4/abstract
Stronger than I take the word of one person.
Sorry.