Fallout: New Vegas Reputation

Reputation in Fallout: New Vegas is a way to measure general feeling for your character in each principal towns and factions like Fallout 2, and will even give you access to new areas in the game.

Reputation can be modified by doing good or bad deeds, like completing quests or killing townsfolk or member of a faction. Your reputation with any given group is a measure of the combined total of Fame and Infamy that you have earned. The benefits and drawbacks of any given reputation depend of the group itself. You may receive discounts with merchants, provoke attacks from hired thugs, or simply be treated differently.

You can also equip faction clothing (e.g. NCR uniform) to impersonate a member of the faction the clothing belongs to, and will be considered one of them, meaning your reputation with the respective faction will be "neutral", regardless of their actual disposition towards you (i.e. a "vilified" reputation will turn into "neutral", as will a "Idolized" reputation, with all drawbacks a lower reputation brings!). Note that such a disguise will only work on common members of that faction and that officers, security guards and dogs will be able to see through it. Also, any member of a faction with a negative disposition towards the faction whos clothing you wear will attack you on sight as your true reputation with that faction will be ignored as long as you are disguised.

Reputation
The 3 different scales of Reputation are Positive, Neutral, Negative. The levels of each scale are listed below. When disguised, none of your typical reputation levels apply. This is reflected in the absence of reputations in your PipBoy.

Positive

 * Idolized = 6
 * Liked = 5
 * Accepted = 4
 * Good Natured Rascal = 3
 * Smiling Trouble Maker = 2
 * Neutral = 1

Neutral

 * Wild Child = 6
 * Unpredictable = 5
 * Mixed = 4
 * Dark Hero = 3
 * Soft-hearted Devil = 2
 * Neutral = 1

Negative

 * Villified = 6
 * Hated = 5
 * Shunned =4
 * Merciful Thug =3
 * Sneering Punk =2
 * Neutral = 1

Bugs
It is possible that the game doesn't register taking off faction armor properly when switching directly to another piece of armor. In that case your PipBoy will still show your reputations as if you were wearing faction armor. This may lead to confusion when the player is being attacked by previously friendly factions. Putting on any kind of faction armor and taking it off again usually restores the players faction standing.