久しぶりにR tutorial。 summary関数 数値に使うと、最小値、四分位、平均、最大値、NAの数を要約します。 そして、数値以外の属性についてもデータセットの概観できます。 > x <- sample(10,100,replace=TRUE) > x[sample(100,10)] <- NA > > y <- data.fra…

PSA screening test is used to diagnose the prostate cancer in US. On the other hand, Japan doesn't recognize the PSA test as the effective test because of a poor evidence. I wrote this topic in the previous diary.Today, U.S. Preventive Ser…