Analyses are underdetermined when the number of parameters to be estimated is greater than the number of data. This problem is also referred to as 'p >> n'.

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17
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5answers
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Detecting significant predictors out of 300 independent variables

In a dataset of two non-overlapping populations (patients & healthy, total $n=60$) I would like to find (out of $300$ independent variables) significant predictors for a continuous dependent ...
11
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4answers
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Minimum sample size for PCA when the main goal is to estimate the first or second principal component?

If I have a dataset with $n$ observations and $p$ variables (dimensions), and generally $n$ is small (n=12-16), and $p$ may range from small (p = 4-10) or perhaps much larger (p= 30-50). I remember ...