Github user iyerr3 commented on a diff in the pull request:
https://github.com/apache/incubatormadlib/pull/33#discussion_r57504661
 Diff: src/ports/postgres/modules/pca/pca.sql_in 
@@ 177,19 +177,29 @@ contain values between 1 and <em>M</em>.</DD>
<DT>components_param</DT>
<DD>INTEGER or FLOAT. The parameter to control the number of principal
components to calculate from the input data. If components_param is INTEGER,
it is used for denoting the number of principal components (<em>k</em>) to
compute. If components_param is FLOAT, the algorithm would return enough
+components to calculate from the input data. If 'components_param' is INTEGER,
+it is used to denote the number of principal components (<em>k</em>) to
+compute. If 'components_param' is FLOAT, the algorithm will return enough
principal vectors so that the ratio of the sum of the eigenvalues collected
thus far to the sum of all eigenvalues is greater than this parameter.
This value has to be either a positive INTEGER or a FLOAT in the range
(0.0,1.0]</DD>
+thus far to the sum of all eigenvalues is greater than this parameter
+(proportion of variance). The value of 'components_param' must be either
+a positive INTEGER or a FLOAT in the range (0.0,1.0]</DD>
+
+@note The difference in interpretation between INTEGER and FLOAT was
 End diff 
Replace everywhere: principle > principal

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