Calculates the percentage of morphometric data points that have been replaced with 'NA' by functions such as
obliterator from LOST. Used to verify the amount of missing data inputted into complete morphometric matrices.
A n X m matrix of morphometric data with n specimens and m variables containing some percentage of missing data
Returns the percentage (as a decimal) of missing data points present in x
J. Arbour and C. Brown
Brown, C., Arbour, J. and Jackson, D. 2012. Testing of the Effect of Missing Data Estimation and Distribution in Morphometric Multivariate Data Analyses. Systematic Biology 61(6):941-954.
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