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A method for determining efficiency of an installed steam turbine includes estimating, at a first plurality of times, a first mean value and a first variance of at least one performance variable of the steam turbine utilizing a set of station sensors. The method further includes estimating, at a sec

A method for determining efficiency of an installed steam turbine includes estimating, at a first plurality of times, a first mean value and a first variance of at least one performance variable of the steam turbine utilizing a set of station sensors. The method further includes estimating, at a second plurality of times including times encompassing at least some of the first plurality of times, a second mean value and a second variance of the at least one performance variable utilizing a different set of sensors, wherein the different set of sensors includes precision sensors. A mapping function is determined between the first mean values and the second mean values using the first mean values, the first variances, the second mean values, and the second variances.

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What is claimed is: 1. A method for determining efficiency of an installed steam turbine, said method comprising: estimating, at a first plurality of times, a first mean value and a first variance of at least one performance variable of the steam turbine utilizing a set of station sensors; estimati

What is claimed is: 1. A method for determining efficiency of an installed steam turbine, said method comprising: estimating, at a first plurality of times, a first mean value and a first variance of at least one performance variable of the steam turbine utilizing a set of station sensors; estimating, at a second plurality of times including times encompassing at least some of said first plurality of times, a second mean value and a second variance of said at least one performance variable utilizing a different set of sensors, wherein said different set of sensors comprises precision sensors; and determining a mapping function between said first mean values and said second mean values using said first mean values, said first variances, said second mean values, and said second variances. 2. A method in accordance with claim 1, further comprising estimating, at least at one time later than the latest of said second plurality of times, an additional mean value of said at least one performance variable of the steam turbine utilizing said set of station sensors and said mapping function. 3. A method in accordance with claim 1 wherein said at least one performance variable comprises section efficiencies of HP, IP, and LP sections of the steam turbine. 4. A method in accordance with claim 1 further comprising estimating, at additional times, a third mean value and a third variance of said at least one performance variable utilizing a subset of said different set of sensors, including at least one said precision sensor, and wherein said determining a mapping function further includes using said third mean values and said third variances along with said first mean values, said first variances, said second variances, and said second variances. 5. A method in accordance with claim 4 wherein said additional times include times between a beginning and an ending time of said second plurality of times and said additional times are different from said second plurality of times. 6. A method in accordance with claim 1 further comprising determining that said mapping function is essentially constant over time. 7. A method in accordance with claim 1 wherein said estimating utilizing said different set of sensors comprises obtaining ASME PTC 6.0 estimates. 8. A method for determining efficiency of an installed steam turbine, said method comprising: estimating, at a first plurality of times, a first mean value and a first variance of at least one performance variable of the steam turbine utilizing a set of station sensors; estimating, at a second plurality of times including times encompassing at least some of said first plurality of times, a second mean value and a second variance of said at least one performance variable utilizing a different set of sensors, wherein said different set of sensors comprises precision sensors; determining a mapping function between said first mean values and said second mean values using said first mean values, said first variances, said second mean values, and said second variances; and repeating said estimating steps and said determining step at a plurality of steam turbines of the same code types at different installations to determine repeatability across sensors of said same type. 9. A method in accordance with claim 8 wherein said at least one performance variable comprises section efficiencies of HP, IP, and LP sections of the steam turbine. 10. A method in accordance with claim 8 further comprising determining that said mapping function is essentially constant over time. 11. A method in accordance with claim 8 wherein said estimating utilizing said different set of sensors comprises obtaining ASME PTC 6.0 estimates. 12. A method in accordance with claim 8, further comprising estimating, at least at one time later than the latest of said second plurality of times, an additional mean value of said at least one performance variable of each said steam turbines of said plurality of steam turbines utilizing said set of station sensors and said mapping function. 13. A method in accordance with claim 8 further comprising estimating, at additional times at each said steam turbine of said plurality of steam turbines, a third mean value and a third variance of said at least one performance variable utilizing a subset of said different set of sensors, including at least one said precision sensor, and wherein said determining a mapping function further includes using said third mean values and said third variances along with said first mean values, said first variances, said second variances, and said second variances. 14. A method in accordance with claim 13 wherein said additional times include times between a beginning and an ending time of said second plurality of times and said additional times are different from said second plurality of times, for each said steam turbine of said plurality of steam turbines. 15. A processor for determining efficiency of a steam turbine, said processor configured to: estimate, at a first plurality of times, a first mean value and a first variance of at least one performance variable of the steam turbine utilizing a set of station sensors; estimate, at a second plurality of times including times encompassing at least some of said first plurality of times, a second mean value and a second variance of said at least one performance variable utilizing a different set of sensors, wherein said different set of sensors comprises precision sensors; and determine a mapping function between said first mean values and said second mean values using said first mean values, said first variances, said second mean values, and said second variances. 16. A processor in accordance with claim 15, further configured to estimate, at least at one time later than the latest of said second plurality of times, an additional mean value of said at least one performance variable of the steam turbine utilizing said set of station sensors and said mapping function. 17. A processor in accordance with claim 15 wherein said at least one performance variable comprises section efficiencies of HP, IP, and LP sections of the steam turbine. 18. A processor in accordance with claim 15 further configured to estimate, at additional times, a third mean value and a third variance of said at least one performance variable utilizing a subset of said different set of sensors, including at least one said precision sensor, and wherein to determine a mapping function, said processor is further configured to use said third mean values and said third variances along with said first mean values, said first variances, said second variances, and said second variances. 19. A processor in accordance with claim 18 wherein said additional times include times between a beginning and an ending time of said second plurality of times and said additional times are different from said second plurality of times. 20. A machine-readable medium having instructions recorded thereon that are configured to instruct a processor to: estimate, at a first plurality of times, a first mean value and a first variance of at least one performance variable of a steam turbine utilizing a set of station sensors; estimate, at a second plurality of times including times encompassing at least some of said first plurality of times, a second mean value and a second variance of said at least one performance variable utilizing a different set of sensors, wherein said different set of sensors comprises precision sensors; and determine a mapping function between said first mean values and said second mean values using said first mean values, said first variances, said second mean values, and said second variances. 21. A medium in accordance with claim 20, wherein said instructions are further configured to instruct a processor to estimate, at least at one time later than the latest of said second plurality of times, an additional mean value of said at least one performance variable of the steam turbine utilizing said set of station sensors and said mapping function. 22. A medium in accordance with claim 20 wherein said at least one performance variable comprises section efficiencies of HP, IP, and LP sections of the steam turbine. 23. A medium in accordance with claim 20 wherein said instructions are further configured to instruct a processor to estimate, at additional times, a third mean value and a third variance of said at least one performance variable utilizing a subset of said different set of sensors, including at least one said precision sensor, and wherein to determine a mapping function, said instructions are further configured to instruct a processor to use said third mean values and said third variances along with said first mean values, said first variances, said second variances, and said second variances. 24. A medium in accordance with claim 23 wherein said additional times include times between a beginning and an ending time of said second plurality of times and said additional times are different from said second plurality of times.