On my WordPress blogs hosted by Dreamhost to get stats I needed to add this to the .htaccess file.

# BEGIN Stats
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^/(stats|failed_auth\.html).*$ [NC]
RewriteRule . - [L]
</IfModule>
# END Stats

This is further explained in the Dreamhost Wiki page Making stats accessible with htaccess.

Dreamhost uses Analog to generate web statistics. Other recommended AWStats which seems more powerful. Maybe I’ll switch if I feel the need.