Slide 1 Tutorial: Optimal Learning in the Laboratory Sciences The power of interactivity December 10, 2014 Warren B. Powell Kris Reyes Si Chen Princeton.

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Slide 1 Tutorial: Optimal Learning in the Laboratory Sciences The power of interactivity December 10, 2014 Warren B. Powell Kris Reyes Si Chen Princeton University Slide 1

Lecture Outline 2  The power of interactivity

Interactivity Guiding the experimental process requires balancing a number of objectives  We would like to run experiments with the highest chance of success.  We also want to learn the most to guide future experiments.  But we also have to consider the cost and complexity of an experiment. 3

Interactivity Prior estimate Value of information Temperature Pressure Highest value of information Temperature Pressure The experiment that produces the highest value of information might require using the highest temperatures and pressures. The scientist has to balance the performance of an experiment, the value of information, and the complexity of the experiment.

Interactivity The accessibility of a region of an RNA molecule mediates interaction with other molecules. Depends on how you define interactions, resulting in several methods for accessing accessibility. Mechanistic Energetic Mechanistically accessible region Well- protected region = inaccessible Designing probles for an RNA molecule

 New Methodology: attempt to bind probe/reporter complex with fluorescent marker. If bound, we observer strong fluorescence signal. Interactivity Probe/Reporter complex If probe can bind, we get fluorescence signal, indicating accessibility. If a probe cannot bind, then we get no fluorescence signal, indicating inaccessibility.

Knowledge Gradient scores High confidence in prior DMS data Each bar is a potential region to probe. The vertical axis is the KG score.

Knowledge Gradient scores Low confidence in prior DMS data This plot tells us how much information can be gained from targeting each region. Highest scoring regions = most information to be gained

Knowledge Gradient scores Use KG scores as a guideline to picking the next experiment. The primer for this highest scoring probe need to be ordered But we have this primer in stock, and it has a reasonably large KG value.

DM US Hex NB La Temperature (C) Concentration Phase Diagram

Policy function approximations Lookup table policies arise in many settings in everyday life © 2013 W.B. Powell Slide 11