想知道如何生成时间序列并同时指定日期。我正在尝试这个
series = as.ts(arima.sim(model = list(ar = c(0.12, -.36)),
n = 1990 - 1875, sd = sqrt(4)),
start = 1875, deltat = 1)
但是这并没有返回一个ts对象来计算1875年的年份。通过我的计算，这应该有效。任何建议表示赞赏。
答案 0 :(得分：1)
你是对的。我重新键入vs剪切/粘贴你的代码，这是start参数和使用as.ts vs ts只是问题：
asim <- arima.sim(model = list(ar = c(0.12, -.36)),
n = 1990 - 1875, sd = sqrt(4))
series <- ts(asim, start = c(1875, 1), deltat = 1)
print(series)
Time Series:
Start = 1875
End = 1989
Frequency = 1
[1] -1.22873543 -2.87876290 -3.00367322 -0.93120214 1.76854684 0.93874091 -2.32494289
[8] 1.14892019 1.87773156 1.48735536 -0.84149973 -3.69650397 1.20710878 2.14151424
[15] -2.58376182 -2.97501726 2.77019523 4.50829433 0.35603642 -1.95517140 -1.12792253
[22] 1.64063413 2.25654663 -0.51293345 1.07829896 -1.77134896 2.38908172 4.29362478
[29] -1.55577635 1.17953083 3.39823289 1.11846543 -0.92758706 -1.24158935 -2.39831233
[36] 4.24302415 2.93797283 -0.75916084 -0.66967525 2.85022663 -0.18190842 -5.39057660
[43] 0.08454559 2.01667062 -3.17054706 -3.77788365 0.19987174 2.87106608 -0.33844973
[50] 1.20917997 -1.00509230 3.23130604 5.80269444 3.33781468 2.67050526 1.85130774
[57] -0.46065144 -2.79539368 0.29784271 -4.51945793 0.61091013 2.56372897 -4.66101520
[64] 2.43024521 0.04428268 -1.19454953 -3.10583191 4.55208114 6.00037902 -3.32996632
[71] 2.22167610 1.07499343 1.89873604 2.04067084 -3.43648828 -0.53093294 0.66225057
[78] -2.30214366 0.78945348 0.35241170 -0.68250626 1.39801271 -1.01914282 -0.33615058
[85] 0.92311887 1.66289752 -0.83158693 -0.74454853 6.53884660 1.53567335 -2.16745416
[92] -0.01540633 -1.25032821 -0.02958796 3.18116493 -2.07512219 -1.40620668 -0.78869155
[99] 2.30251140 -2.23997817 0.34824690 4.81898402 -0.38751197 -5.74540148 -0.37754295
[106] 2.59869857 -1.90175430 0.37994317 -1.27326292 -3.96302760 -2.01928982 2.57643462
[113] 2.62600151 -4.20987173 0.46388883
由于asim已经是ts类对象，as.ts正在从中提取tsp属性，而不是从输入参数创建它。使用ts可创建新的tsp属性。