Open carry or concealed carry is not going to be a factor where stats can be compiled.
Maybe OC will not deter crime. Maybe CC does not deter crime. Either way it cannot be proven.
What can be proven would not be allowed to be posted here since it would be political. New Orleans, Houston, Chicago, NYC, LA or any of the other major cities will have their crime rates highest in the government funded, low income, welfare areas where Democratic control has given people so much for so long that the areas have became "Give me or I will take it" subdivisions. Criminals will watch for the postman in low income, government supported areas on the days the checks go out so they can take them from the mailboxes. Since the, mostly male, population of those areas do not work, they sit around drinking and playing cards, dominoes or such. They get to talking and arguments begin. Weapons are produced and people are killed. Drug dealers are common in these areas because drug use is more common among those that do not work.
FWIW: Louisiana recently introduced legislation that would have required drug testing for those on welfare, medicaid or other government funded programs. It was voted down by the Democrats since they buy their votes by offering giveaway programs and people vote their pocketbooks.
As to open carry, most on this site are honest, productive citizens but even the criminal element does not like citizens with guns. Has anyone else on here ever heard that polls taken in prisons show the thing that worries criminals most is armed people? If you are carrying openly, the criminals will not mess with you in most instances. If you are carrying concealed, you are more of a target because they do not know you are armed, they have the element of suprise on you and they already have their weapon out while you have to dig for yours.
Thus far, only one case has been documented where a civilian carrying openly had his gun taken. It was later learned that he was not a gun person and began wearing the gun due to his being robbed previously. Add to that, he ended up giving the assailant his gun. Try searching for instances of how many people have been disarmed by criminals when they were carrying concealed.
I do not care how one carries. I do care about how many guns they carry or how much ammo they carry but that is more of a personal peave of mine. I know I carry more than anyone on this board and walk into neighborhoods that most here would not want to drive through. I am on the streets from 10-14 hrs per day, seven days a week and always armed. I got in last night about 7pm and was called back out to a scene at 1am, back home at 3am and now getting ready to go to a meeting at 8am so I can be at an impound yard by 9am. Always armed. Walking in my yard, going out to eat, I am armed and not once has someone tried to take my sidearm. Had a few try to buy it but never take it.
Carry in what manner you want. Yet I maintain the instance of crime is deterred by open display of a gun. Would crime stats say how many robberies did not occur because a robber did not see a gun? NO. Will stats say how many times a person openly carrying stopped a robbery in progress? NO. But then concealed carry will not show up in the stats either.
What I will assure you is that if one sees a person openly carrying in areas where it is legal, they are not street punk thugs. In almost 40 yrs of working, I have yet to encounter a member of the cirminal element carrying openly. They ALWAYS carry concealed. At least those in favor of concealed carry has something in common with the criminal element.
What's the % in a "not so nice" neighborhood? 
