Stacked vs. Unstacked datamain topic
Stacked vs. Unstacked dataIn unstacked data, each sample is in a separate column. Alternatively, you can stack all the data in one column and add a column of grouping indicators that define each sample. Like censoring indicators, grouping indicators can be numbers or text.
Here is the same data set structured both ways:
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Unstacked Data |
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Stacked Data |
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Drug A 20 30 43 51 57 82 85 89 |
Drug B 2 3 6 14 24 26 27 31 |
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Drug 20 30 43 51 57 82 85 89 2 3 6 14 24 26 27 31 |
Group A A A A A A A A B B B B B B B B |
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Note |
You cannot analyze more than one column of stacked data at a time, so the grouping indicators must be in one column. |