PMC:7782580 / 63020-63124 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T472","span":{"begin":0,"end":104},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The kappa index is a statistical method for assessing the degree of agreement between different methods."}