which sample variable is non-stationary r? how to find the acf of a random walk in r why is sample acf stationary which of the following variables is stationary in the first two moments? why does the value of pacf change with lag what is the value of random acf why is pacf stationary why does pacf decrease linearly? why does pacf decrease during r plot is sample pacf stationary what is the test pacf why does random path sample acf decrease linearly is sample pacf a stationary variable why is sample acf not fixed why is sample acf which random variable is not stationary in the first two moments? when r plot samples acf and pacf is sample acf stationary and pacf not stationary what makes sample acf and pacf zero sample pacf of a random walk