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R
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Range – with regards to subgroups in control charting
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R Chart
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Range chart – showing the ranges of the subgroups the R Bar and the UCLR
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Random Effects Model
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A situation where we want to extend the conclusions of a statistical test beyond the levels of the factors used in the test, the factors therefore must be random factor levels from a larger population of potential levels.
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Random Factors
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In some experimental situations the factor levels are chosen at random from a larger set of potential factor levels. The intent being to draw conclusions of the larger population of levels of the factor not just those used.
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Random Variation
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See Common Cause Variation
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Range
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Difference between the largest data value and the smallest data value, in a subgroup or data set.
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RASIC or RASI
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A method to evaluate business processes compared to individuals (or functions) with regards to who is; responsible, accountable, supportive, informed and consulted.
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RCBD
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Randomized Complete Block Design – Running a DOE with two blocks randomizing within the block.
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RCCA
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Root Cause and Corrective Action
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Repeatability
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Variation between successive measurements of the same part, same characteristic, by the same person using the same instrument (short term variation)
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Repeats
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With one set up in a DOE and running multiple parts per treatment to quantify the impact of factors on short term variation, does not add df to the analysis.
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Replicate
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Within a DOE the additional run of all treatments to understand the short term to medium term variation usually including multiple set ups. Adds df to the analysis.
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Reproducibility
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The difference in the average of the measurements made by different persons using the same instrument, but different set-ups, when measuring the identical characteristic
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RICBD
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Randomized Incomplete Block Design – Running a DOE with a block within one factors levels sets.
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ROI
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Return on Investment – a financial term to define the value of the decision or project.
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Root Cause Analysis
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Identifying the “true” reason for a known issue. 5 Why’s, Cause and Effect Diagram and Cause and Effect Matrix are some tools for getting to the root cause.
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ROT
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Rule of Thumb
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RPN
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Risk Priority Number - The product of Severity, Occurrence, Detectability on an FMEA
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RTY
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Rolled Throughput Yield – A measure of a process that looks at the probability of a product going through a process without a defect. This can be calculated by multiplying the FPY of each process step together.
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