R language Visual facet chart, multivariable grouping nested multilevel t-test, and specify reference level, visual multivariable grouping nested multilevel faceting boxplot, and add significance leve

R Language visualization facet 、 Multivariable grouping nested multilevel t test 、 And specify the reference level 、 Visual multivariable grouping nested multi-level faceted box diagram （faceting boxplot） And add significance level 、 Specify the significance reference level

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