As scjessey already noted, Analog is the DH tool that is pre-installed; to use a completely different stats package, you will need to wait until/if DH changes from Analog or install another yourself.
That said there are a couple of other alternatives that might be helpful:
1) You can modify some of how Analog reports your site statistics from the Control Panel, by browsing to the Status -> Site Stats page. From there you can modify the number of days logs are retained and some of the features of the Analog reports.
2) You can also download your raw logs and process them on your own computer using other software - sometimes this is just easier than installing a custom stats package if you are doing specific research for a given period of time.