Getting Proxy Error in Appium Installation on MAC

I am getting below error while running the npm install -g appium command on MAC.

npm ERR! Darwin 14.1.0
npm ERR! argv “node” “/usr/local/bin/npm” “install” “-g” “appium”
npm ERR! node v0.12.0
npm ERR! npm v2.5.0
npm ERR! errno ETIMEDOUT
npm ERR! syscall connect

npm ERR! network connect ETIMEDOUT
npm ERR! network This is most likely not a problem with npm itself
npm ERR! network and is related to network connectivity.
npm ERR! network In most cases you are behind a proxy or have bad network settings.
npm ERR! network
npm ERR! network If you are behind a proxy, please make sure that the
npm ERR! network ‘proxy’ config is set properly. See: ‘npm help config’

npm ERR! Please include the following file with any support request:
npm ERR! /Users/Paras/npm-debug.log