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The process

$X_{t}$ is said to be wide sense stationary (WSS) if

$\begin{align}\mathbf{E}[X_{t}]&=\text{constant}\\\mathbf{E}[X_{t_{1}}X_{t_{2}}]&=\text{depends only on }|t_{1}-t_{2}|\end{align}$

status	not learned	measured difficulty	37% [default]	last interval [days]
repetition number in this series	0	memorised on		scheduled repetition
scheduled repetition interval		last repetition or drill

No repetitions

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