First download anaconda from the Continuum site. Either via the graphical installer (Windows/OSX) or running a shell script (OSX/Linux). This includes pandas!
If you don't want the 150 packages conveniently bundled in anaconda, you can install miniconda. Either via the graphical installer (Windows) or shell script (OSX/Linux).
Install pandas on miniconda using:
conda install pandas
To update pandas to the latest version in anaconda or miniconda use:
conda update pandas