References
- Probability and Mathematical Statistics Taylor,L.D.
- Applied Regession Analysis Draper,N.R.;Smith,H.
- Introduction to Matrices and Linear Transformations Finkbeiner,D.T.
- An Introduction to Linear Statistical Models v.1 Graybill,F.A.
This paper considers the problem of estimating $\hat{\beta}$ in the case errors occur in observing the values of q-variables $X_1, X_2, ..., X_q$. The approximated estimator $\hat{\beta}(e)$ is obtained and its expected value, bias and covariance matrix are studied.