Week of August 29 – September 2, 2011 Monday, August 29, 2011 1:30 PM Advisory Committee Meeting 400 MSC 1:30 PM Math 1150 Instructor Meeting 459 MSC 3:30 PM Calculus Seminar 459 MSC Tuesday, August 30, 2011 11:30 AM Calculator Workshop 459 MSC 12:30 PM Math 1150 Instructor Meeting TBD 1:30 PM Foundational Math Committee Meeting 400 MSC 3:45 PM Statistics group meeting 459 MSC Wednesday, August 31, 2011 10:30 AM R Seminar 400 MSC 11:30 AM Statistics Seminar 459 MSC Dr. John Carson, Chief Statistician, Shaw Group. Findlay, OH LCMRL, an Improved Approach to Estimating Quantitation Limits in Analytical Chemistry USEPA and Shaw Environmental and Infrastructure have developed an improved method for estimating the lowest concentration at which 'reliable' measurements can be made, known as the Lowest Concentration Minimum Reporting Level (LCMRL). The LCMRL is the lowest true concentration for which future sample recovery is predicted to fall, with high confidence (99%), between 50% and 150%. The procedure simultaneously takes into account precision and accuracy. Replicate samples at each of several known concentrations are taken through the entire measurement process. Functions for the expectation and variance of the measurements as a function of the true sample concentrations are estimated iteratively, as in Generalized Estimating Equations. The variance function is a constant + power function, which accommodates constant variance, constant CV and anything in between. Given the mean and variance of response as a function of true concentration, the measurement distribution is taken to be the maximum entropy distribution. That is, normal when negative measurements are possible or gamma when they are not. At this point, we can estimate probabilities of any event that we are interested in the distribution of measurements as a function of true concentration, including the probability that the measured value is between 50% and 150% of the true value. Quantities associated with analyte detection, the critical level and detection limit, can also be computed. 2:30 PM Putnam Team Meeting 459 MSC 3:30 PM Analysis Seminar 459 MSC Dr. Kit Chan, BGSU Hypercyclic vectors for the unitary orbit of a hypercyclic operator Thursday, September 1, 2011 10:30 AM Math 1210 Instructor Meeting 459 MSC 12:50 PM Algebra/Geometry Seminar 459 MSC 1:30 PM Math 1260 Instructor Meeting 400 MSC Friday, September 2, 2011 3:30 PM NO COLLOQUIUM 459 MSC
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