Run Chart

There are several tools that you can use to evaluate process performance over time:

• Run charts: (ala Minitab) view this as a naked control chart.  You have a center line (which you can place as the mean or median), but you do not have control limits.  Minitab lets you do several things: you can actually subgroup if your samples have employed a rational subgrouping strategy; there are also statistical tests (for trends, oscillations, mixtures, and clustering); and of course, you can "eyeball" the chart to see if there are any patterns that would suggest trends, oscillations, mixtures, and clusters.
• Control charts: lets you assess stability of the process over time.  Will actually generate signals for out of control conditions.  You can also subgroup data.
• Time Series Plot: just a plot of the data over time.  Strictly an "eyeball" chart.  To the best of my knowledge, you cannot automatically subgroup the data in Minitab

Hope this is what you were seeking...