使用分段函数进行分段回归：psi超出允许范围

Question

我的数据：

require(segmented)
y <- c(0.079, 0.079, 0.079, 0.080, 0.080, 0.081, 0.081, 0.081, 0.081, 0.081, 0.081, 0.082, 0.083, 0.084, 0.086, 0.088, 0.088, 0.088, 0.088, 0.088)
x <- c(1443991015, 1443994615, 1443998215, 1444001815, 1444005415, 1444009015, 1444012615, 1444016215, 1444019815, 1444023415, 1444027015, 1444030615, 1444034215, 1444037815, 1444041415, 
           1444045015, 1444048615, 1444052215, 1444055815, 1444059415)

nb：x数据是POSIXct日期，现已转换为“数字”格式。

我的线性模型：

lin.mod <- lm(y ~ x)

输出：

    Call:
lm(formula = y ~ x)

Coefficients:
(Intercept)            x  
 -2.201e+02    1.525e-07  

现在，我想查找断点是否存在

我愿意

segmented.mod <- segmented(obj = lin.mod, seg.Z = ~x, psi = 11)

但是我给我这个错误消息：

    Error in segmented.lm(obj = lin.mod, seg.Z = ~dates, psi = 11) : 
  starting psi out of the admissible range