untitled

6.2 Vector Space Retrieval 133

Word Number of occurrences Number of documents

the 61735764 7656676

of 56188095 8838209

and 35936471 7398465

in 33774127 7492125

to 18670139 5482347

a 18257728 5846177

with 12881242 4904841

was 10202515 3683332

for 8961803 4155330

human 8823139 7284714

were 8569580 3348418

by 8312546 3872850

that 7060247 3500824

is 6941721 3340361

metabolism 6459988 2119436

on 5669049 3324379

effects 5383334 2450007

from 5230712 2868785

drug 5141572 2305403

patients 5120897 1680125

as 4631373 2635318

or 4628590 2551277

at 4127714 2236276

cells 4112303 1303540

blood 4040580 1646084

this 3982055 2657101

an 3942049 2647511

male 3908310 3580224

be 3803795 2491683

female 3777242 3496974

support 3751655 2924479

pharmacology 3667686 1550452

analysis 3660441 1964018

are 3650898 2205386

Table 6.1 Number of occurrences of the most common words in PubMed