Billboard formula says ROF bigger hit than Gypsy (!)

[ricohv]

I'm always amazed that Gypsy didn't crack the top 10 (same with Rooms On Fire..although by that point in her career Stevie was losing steam with her singles charting). According to this Billboard article which ranks Stevie's 10 biggest singles (peak position combined with weeks on the chart, etc.) Rooms On Fire lands at number 10 and Gypsy isn't on there at all (although her other FM singles are: Dreams, Sara & Rhiannon).
This seems ironic to me considering I hear Gypsy fairly regularly on certain stations but NEVER hear Rooms On Fire. EVER.
http://www.billboard.com/articles/ne...billboard-hits
*Ricoh*