PMC:7780429 / 9222-9373 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T58","span":{"begin":0,"end":151},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"We used the Χ2 test to contrast whether there is independence between two categorical variables using a contingency table when the data are not paired."}