textual and visual data analysis (wip)

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+# Textual Data Analysis
+
+## Parameter and NFP overview
+
+`--info` prints the names and ranges of observed **parameters** (configuration values) and **Observations** (performance attributes / NFPs).
+It is also helpful to determine if and how parameter filters affect the subset of data used for analysis.
+
+## parameter filters
diff --git a/doc/analysis-visual.md b/doc/analysis-visual.md
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+# Visual Data Analysis
+
+The parameter and NFP filters from [Textual Data Analysis](analysis-textual.md) apply here as well.
+
+## Raw Data Visualization
+
+There are two ways of visualizing all measured data independent of their parameters:
+
+* `--boxplot PREFIX` writes boxplots of all observations to PREFIX/(name)-(attribute).pdf. These may be helpful to see which observations are stable and which show a lot of variance, possibly due to the influence of parameters.
+* `--plot-unparam=name:attribute:ylabel` plots all observations of name/attribute in the order in which they were observed. Useful to identify trends, especially when the parameter variation scheme is known as well.