Use of statistics to determine calibration of instruments

A method of using statistics to determine calibration of instruments, comprising:

• (a) sensing at least one critical value in a process flow by a first sensing instrument;
• (b) sensing the at least one critical value in the process flow by a second sensing instrument, wherein the first sensing instrument is a different type of sensing instrument than the second sensing instrument;
• (c) obtaining first tracking information from said first sensing instrument, and obtaining second tracking information from said second sensing instrument:
• (d) sending said first tracking information and said second tracking information to a computer;
• (e) tracking in said computer relative consistency of the first tracking information and the second tracking information to detect a drift representing changes in mean differences between said first tracking information and said second tracking information occurring over a period of time;
• and
• (f) in response to detecting the drift, determining which instrument of the first sensing instrument and the second sensing instrument is a cause of the drift by identifying a change in a standard deviation of at least one of the first tracking information and the second tracking information.

A non-transitory program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for using statistics to determine calibration of instruments, the method steps comprising:

• (a) sensing at least one critical value in a process flow by a first sensing instrument;
• (b) sensing the at least one critical value in the process flow by a second sensing instrument, wherein the first sensing instrument is a different type of sensing instrument than the second sensing instrument;
• (c) tracking relative consistency of a first set of data obtained from said first sensing instrument and a second set of data obtained from said second sensing instrument to detect a drift representing changes in mean differences between the first set of data and the second set of data occurring over a period of time;
• and
• (d) in response to detecting the drift, determining which instrument of the first sensing instrument and the second sensing instrument is a cause of the drift by identifying a change in a standard deviation in at least one of the first set of data and the second set of data.

A non-transitory program storage device readable by machine, tangibly embodying a program of instructions executable by the machine to perform method steps for using statistics to determine calibration of instruments, the method steps comprising:

• (a) sensing at least one critical value in a process flow by a first sensing instrument;
• (b) sensing the at least one critical value in the process flow by a second sensing instrument, wherein the first sensing instrument is a different type of sensing instrument than the second sensing instrument;
• (c) obtaining first tracking information from said first sensing instrument, and obtaining second tracking information from said second sensing instrument:
• (d) sending said first tracking information and said second tracking information to a computer;
• (e) tracking in said computer relative consistency of the first tracking information and the second tracking information to detect a drift representing changes in mean differences between the first tracking information and the tracking information occurring over a period of time;
• and
• (f) in response to detecting the drift, determining which instrument of the first sensing instrument and the second sensing instrument is a cause of the drift by identifying a change in a standard deviation of at least one of the first tracking information and the second tracking information.