why do kalman filters go negative in a data set where does the state noise variance go negative kalman filter why is it negative? why does kalman filter get negative what is the function for the kalman filter why does the covariance matrix become negative why is it that the state variance is negative in kalman filter why does kalman filter throw up causes of negative variance why would a kalman filter become negative what is the difference in a negative kalman filter why is state noise a problem with kalman filter why is the kalman filter being negative what would cause a kalman filter to go negative kalman filter how to round a state noise when state noise is zero in kalman filter why does kalman filter make state noise when a matrix is zero what is the result why does kalman filter get negative value why is kalman coefficient of error negative