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此词条暂由彩云小译翻译，草三水甫整理和审校。
In [[Dynamical system|mathematical dynamics]], '''discrete time''' and '''continuous time''' are two alternative frameworks within which to model [[Variable (mathematics)|variables]] that evolve over time.
In [[Dynamical system|mathematical dynamics]], '''discrete time''' and '''continuous time''' are two alternative frameworks within which to model [[Variable (mathematics)|variables]] that evolve over time.
==Discrete time==
==Discrete time==
[[Image:Sampled.signal.svg|right|thumb|Discrete sampled signal]]
[[Image:Sampled.signal.svg|right|thumb|Discrete sampled signal|链接=Special:FilePath/Sampled.signal.svg]]
Discrete sampled signal
Discrete sampled signal
When one attempts to empirically explain such variables in terms of other variables and/or their own prior values, one uses time series or regression methods in which variables are indexed with a subscript indicating the time period in which the observation occurred. For example, y<sub>t</sub> might refer to the value of income observed in unspecified time period t, y<sub>3</sub> to the value of income observed in the third time period, etc.
When one attempts to empirically explain such variables in terms of other variables and/or their own prior values, one uses time series or regression methods in which variables are indexed with a subscript indicating the time period in which the observation occurred. For example, y<sub>t</sub> might refer to the value of income observed in unspecified time period t, y<sub>3</sub> to the value of income observed in the third time period, etc.
当人们试图根据其他变量和/或他们自己先前的值对这些变量进行实证解释时，他们使用时间序列或回归方法，在这些方法中，变量被索引，下标表示观测发生的时间周期。例如，y < sub > t </sub > 可能是指在非特定时间段 t 观察到的收入值，y < sub > 3 </sub > 是指在第三时间段观察到的收入值，等等。
当人们试图根据其他变量和/或他们自己先前的值对这些变量进行实证解释时，他们使用时间序列或回归方法，在这些方法中，变量被索引，下标表示观测发生的时间周期。例如，y < sub > t 可能是指在非特定时间段 t 观察到的收入值，y < sub > 3 是指在第三时间段观察到的收入值，等等。