Perhaps you should try some spelling variations:
"processing digital statistics methods." » "processing vital statistics methods.", "processing capital statistics methods.", "processing criminal statistics methods.", "processing digital statistics methodology."
"processing base statistical methods." » "processing bayesian statistical methods.", "processing _ statistical methods.", "processing data statistical methods.", "processing spain statistical methods.", "processing zones statistical methods."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("processing digital statistics methods.") or ("processing base statistical methods."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("processing digital statistics methods.") OR ("processing base statistical methods."))*.
• Removing quotes may allow a broader search: (( processing digital statistics methods. ) or ( processing base statistical methods. ))*.