variance-covariance matrix (w/o data analysis kit)
How do I calculate the variance/covariance matrix (w/o using the data
analysis kit)? Say I have a matrix X (each column of the matrix represents a different variable), would the consistent variance/covariance matrix be X'X/(N-1)? However, when I calculate the covariance-matrix from the data analysis program, I get a different answer (even considering the n/n-1 recalculation) from X'X/(N-1). They are close but still slightly different. What am I doing wrong? Thank you for your help. |
All times are GMT +1. The time now is 11:15 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
ExcelBanter.com