同窓会で５年後に全員生存している確率は～H27の日本人完全生命表で計算する

＃追記
ここをクリックでブラウザで各自計算できます

昔の記事で日本人の生存曲線を扱ったが、H27の国勢調査のデータによる完全生命表が出ているのでアップデートすることにした。

http://www.mhlw.go.jp/toukei/saikin/hw/life/22th/
ここのデータを引っ張ってくる。
pdfを読む関数を使ってみたが、マルチバイト文字のエラーとか色々で余計時間かかるわってなって断念。
pdf-excel変換ソフトを使ったらあっさり行けた。

というか、pdfでの公開はやめて欲しい。csvがベスト、せめてエクセルでお願いしたいものだ。

せっかくデーターを得たので何か計算しよう。

先日母校の同窓会にでたりしたが、自分たちも恩師も明らかに年をとってきており、次回５年後に全員生きている可能性はどんなものか気になった。

アップデートされたデータで計算してみる。

とりあえずフィクションの例を提示する
生徒は40才で男女35人ずつ、先生が７５男性、７０男性、６５女性とする。
この合計７３人が全員5,10,15,20年後に生存している率を日本人の生命表を元に計算する。

その他たとえば、家族全員のデータを入れても興味深いだろう。
生命保険に入るかどうかとか、起業した場合のリスクとか、相続の可能性とか色々参考に出来るだろう。

calc_all_alive(
      target_age = c(40, 40, 75, 70, 65),  #対象の年齢
      target_sex = c(0, 1, 1, 1, 0),       #対象の性男１女０
      target_N = c(35, 35, 1, 1, 1),     #対象の人数
      target_year = c(5, 10, 15, 20),      #計算する年数
      plot_year = 30                      #plotする年数
)

           平均余命 余命中央値 5年後の生存率 10年後の生存率 15年後の生存率 20年後の生存率
40才女性       47.7       49.9     0.9962918      0.9905526     0.98178217    0.969697582
40才男性       41.8       44.0     0.9937605      0.9837753     0.96786605    0.943009822
75才男性       12.0       11.9     0.8392625      0.6055661     0.33302515    0.115608795
70才男性       15.6       15.9     0.8994071      0.7548386     0.54465039    0.299525175
65才女性       24.2       25.4     0.9727091      0.9300539     0.85822970    0.729128645
全員生存率       NA         NA     0.5178770      0.1720260     0.02607728    0.001102978

このばあい、５年後に全員生きている可能性は五分五分の51.7%
１０年後だと１７％しかない。基本誰かが死んでしまうということ。
リアルな結果に戦慄した。

以下計算するプログラム。

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824511,752979,683725,616955,552891,491760,433791,379213,
328246,281088,237907,198811,163842,132982,106153,83220,
63987,48199,35550,25674,18144,12529,8447,5553,3556,2215,
1341,788,449,247,132,68,34,16,7,3,1),ex=c(86.99,
86.14,85.17,84.19,83.2,82.2,81.21,80.22,79.22,78.23,
77.23,76.24,75.24,74.25,73.25,72.26,71.27,70.28,69.29,
68.3,67.31,66.32,65.33,64.34,63.36,62.37,61.39,60.4,
59.42,58.44,57.45,56.47,55.49,54.51,53.53,52.55,51.57,
50.59,49.61,48.64,47.67,46.7,45.73,44.76,43.8,42.83,
41.87,40.92,39.96,39.01,38.07,37.12,36.18,35.24,34.31,
33.38,32.45,31.53,30.61,29.68,28.77,27.85,26.94,26.04,
25.14,24.24,23.35,22.47,21.59,20.72,19.85,18.99,18.14,
17.3,16.46,15.64,14.82,14.02,13.23,12.46,11.71,10.99,
10.28,9.59,8.94,8.3,7.7,7.12,6.57,6.05,5.56,5.11,4.68,
4.29,3.94,3.63,3.36,3.11,2.88,2.68,2.5,2.33,2.17,2.03,
1.9,1.78,1.67,1.57,1.48,1.39,1.31,1.23,1.16,1.1,1.04,
0.98,80.75,79.92,78.94,77.96,76.97,75.98,74.99,74,73,
72.01,71.02,70.02,69.03,68.03,67.04,66.05,65.06,64.07,
63.09,62.11,61.13,60.16,59.19,58.22,57.25,56.28,55.31,
54.34,53.37,52.4,51.43,50.46,49.49,48.52,47.55,46.58,
45.62,44.65,43.69,42.73,41.77,40.81,39.86,38.9,37.96,
37.01,36.07,35.13,34.2,33.28,32.36,31.44,30.54,29.63,
28.74,27.85,26.97,26.09,25.23,24.36,23.51,22.67,21.83,
21.01,20.2,19.41,18.62,17.85,17.08,16.33,15.59,14.85,
14.13,13.43,12.73,12.03,11.36,10.69,10.05,9.43,8.83,
8.25,7.7,7.18,6.69,6.22,5.78,5.37,4.98,4.61,4.27,3.95,
3.66,3.4,3.18,2.98,2.79,2.62,2.46,2.31,2.18,2.05,1.94,
1.83,1.73,1.63,1.55,1.46,1.39,1.32,1.25,1.19,1.13),
sexM1=c(0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
1,1,1,1)),.Names=c("x","lx","ndx","npx","nqx",
"mux","nLx","Tx","ex","sexM1"),class="data.frame",row.names=c(NA,
-229L))

calc_all_alive <- function(
target_age = c(45, 45, 75, 70, 65),  #対象の年齢
target_sex = c(0, 1, 1, 1, 1),       #対象の性男１女０
target_N = c(100, 100, 1, 1, 1),     #対象の人数
target_year = c(5, 10, 15, 20),      #計算する年数
plot_year = 30                      #plotする年数
){      
if(length(target_age) != length(target_sex) | length(target_age) != length(target_N)){
      cat("入力データエラー。データの長さが異なります")
      return(NA)
}else{
      plot(NULL, type = "n", xlim = c(0, plot_year), ylim = c(0,1), labels = NULL, ylab = "survival rate", xlab = "years", lab = NULL)
      
      col_1 <- rainbow(length(target_age))
      
      for(i in 1:length(target_age)){      
      temp2 <- subset(dat, sexM1 == target_sex[i]) 
      lines(seq_len(length(temp2$lx[temp2$x >= target_age[i]])) - 1, 
            temp2$lx[temp2$x >= target_age[i]]/temp2$lx[temp2$x == target_age[i]], 
            ann=F, type = "l", col = col_1[i], lty = i) #年齢別生存確率
      }
      tsex_temp <- chartr(c("01"), c("女男"), target_sex)
      legend_1 <- paste0(target_age, "才", tsex_temp, "性")
      
      legend("bottomleft", legend = legend_1, col = col_1, lty = 1:length(target_age),
             text.col = col_1, bty = "n")
 
      abline(v = c(0, target_year), lty = 3)     
      abline(h = c(0, 0.2, 0.4, 0.6, 0.8, 1), lty = 3)    
      
      result <- matrix(0, nrow = length(target_age), ncol = 2 + length(target_year))
      row.names(result) <- legend_1
      colnames(result) <- c("平均余命", "余命中央値", paste0(target_year, "年後の生存率"))

      ave.yomei <- function(age = 80, M1F0 = 1){
            temp <- subset(dat, sexM1 == M1F0)
            temp$ex[temp$x == age]
      }
      
      cal.median <- function(y, b){  #age = y #sex=b(F0M1) 以降でのmedian生存期間
            ssp <- smooth.spline(dat$lx[dat$sexM1 == b]/100000, dat$x[dat$sexM1 ==b])
            temp <- dat$lx[dat$sexM1 == b & dat$x == y]/100000
            return(predict(ssp, x = temp / 2)$y - y)      
      }
      
      result[,1] <- round(Vectorize(ave.yomei)(age = target_age, M1F0 = target_sex), digits = 1)
      result[,2] <- round(Vectorize(cal.median)(y = target_age, b = target_sex), digits = 1)

      for(i in 1:length(target_age)){    
      temp2 <- subset(dat, sexM1 == target_sex[i]) 
      for(j in 1:length(target_year)){
      result[i, 2 + j] <- temp2$lx[temp2$x == (target_age[i] + target_year[j])]/temp2$lx[temp2$x == target_age[i]] #年齢別生存確率
      
      }
      }
      temp_alive <- result[,3:(2+length(target_year))] ^ target_N
      alive_all <- c(NA, NA, apply(temp_alive, 2, function(x){Reduce("*", x)}))
result <- rbind(result, alive_all)
row.names(result) <- c(legend_1, "全員生存率")
return(result)

}      
}