Perhaps you should try some spelling variations:
"greater decrease" » "greater decreased" (Expand Search), "greater increase" (Expand Search)
"ties decrease" » "ties decreased" (Expand Search), "ties increase" (Expand Search)
"pearson decrease" » "pearson decreased" (Expand Search), "pearson increase" (Expand Search), "person decrease" (Expand Search)
"per decrease" » "per decreased" (Expand Search), "per increase" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"greater decrease\") OR (((((\"ties decrease\") OR (\"pearson decrease\"))) OR (\"per decrease\"))))~".
• Removing quotes may allow a broader search: (( greater decrease ) OR ((((( ties decrease ) OR ( pearson decrease ))) OR ( per decrease ))))~.
• Adding a wildcard symbol may retrieve word variants: (("greater decrease") OR ((((("ties decrease") OR ("pearson decrease"))) OR ("per decrease"))))*.