Health informatics

1. A new retrieval algorithm is being evaluated using a test database, constructed for that purpose. A single search (search ‘A’) of the database retrieved a total of 6,400 documents, of which 1,129 pertain to the topic being studied. Several additional searches on the topic of interest were also conducted and these additional searches plus search ‘A’ retrieved a total of 7,395 distinct documents, of which 1,488 pertained to the topic of interest. The person who constructed the database tells you that there are a total of 10,500 documents in the database, of which 1,750 are pertinent to the topic of your search.

0. Given all of the above information, with respect to search ‘A’ what quantity (quantities) (recall, precision, or relative recall) can be calculated?

0. With respect to search ‘A’, what is (are) the value(s) of that quantity (those quantities)?

1. Given:

Set A = (red, orange, yellow, green, blue, violet)

Set B = (red, pink, orange, white, brown, violet)

Set C = (orange, mauve, yellow, lavender, white, green, violet)

Find:

Set D = (A OR B) AND (C NOT A).

Show all steps.

1. Why are data and computer programs stored on removable storage media, rather than in main memory where they can be accessed faster?