Fannie's stock often trades according to the direction of the economy rather than the particulars of the stock, said analysts. Institutional investors view Fannie as a classic growth stock, said PaineWebber analyst Gary Gordon. That makes Fannie attractive during a weakening economy when other corporate stocks are off, but makes it look "ho-hum" as the economy reignites. Another major risk for Fannie's stock, said Mr. O'Donnell, involves interest rates. Any decline in stock price, however, presents a buying opportunity, said Mr. O'Donnell. Separately, Salomon Brothers analyst Bruce Harting raised his ratings on Coast Savings Financial to "buy" from "hold," on an improved earnings outlook. Mr. Harting raised his earnings estimates for 1995 to $1.15 a share from $0.90, and for 1996 to $2.45 from $2. Mr.