all over the map vs methodical

all over the map

prep
  • Widely scattered or distributed; numerous and differing greatly. 

  • In widely scattered directions; in a widely varying manner. 

methodical

adj
  • In an organized manner; proceeding with regard to method; systematic. 

  • Arranged with regard to method; disposed in a suitable manner, or in a manner to illustrate a subject, or to facilitate practical observation. 

How often have the words all over the map and methodical occurred in a corpus of books? (source: Google Ngram Viewer )