Found the following HTML validation problems:
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sumstat_class.html:380:1 (sumstat_class.Rd:204): Warning: missing </ul> before </div>
sumstat_class.html:131:1 (sumstat_class.Rd:61): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:137:1 (sumstat_class.Rd:65): Warning: <h5> anchor "Arguments" already defined
sumstat_class.html:156:1 (sumstat_class.Rd:78): Warning: <h5> anchor "Returns" already defined
sumstat_class.html:177:1 (sumstat_class.Rd:91): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:183:1 (sumstat_class.Rd:95): Warning: <h5> anchor "Arguments" already defined
sumstat_class.html:196:1 (sumstat_class.Rd:102): Warning: <h5> anchor "Returns" already defined
sumstat_class.html:213:1 (sumstat_class.Rd:111): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:219:1 (sumstat_class.Rd:115): Warning: <h5> anchor "Returns" already defined
sumstat_class.html:236:1 (sumstat_class.Rd:124): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:242:1 (sumstat_class.Rd:128): Warning: <h5> anchor "Returns" already defined
sumstat_class.html:259:1 (sumstat_class.Rd:137): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:265:1 (sumstat_class.Rd:141): Warning: <h5> anchor "Returns" already defined
sumstat_class.html:282:1 (sumstat_class.Rd:150): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:288:1 (sumstat_class.Rd:154): Warning: <h5> anchor "Returns" already defined
sumstat_class.html:305:1 (sumstat_class.Rd:163): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:321:1 (sumstat_class.Rd:173): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:327:1 (sumstat_class.Rd:177): Warning: <h5> anchor "Arguments" already defined
sumstat_class.html:340:1 (sumstat_class.Rd:184): Warning: <h5> anchor "Returns" already defined
sumstat_class.html:357:1 (sumstat_class.Rd:193): Warning: <h5> anchor "Usage" already defined
sumstat_class.html:363:1 (sumstat_class.Rd:197): Warning: <h5> anchor "Arguments" already defined