The evolution of reel statistical methods, TAPPI Journal June 2019

Application: Mills can establish a stopping rule to prevent needless efforts to improve MD and CD when variances are not statistically significant. Direct conversion between TAPPI Standard Test Method T 545 and TIP 1101 can be performed using only the F-ratios.  The 1-pass (Computational) Method is an acceptable computation method on reel statistics calculations. 

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Author: Kerry D. Figiel and Michael Forbes
The evolution of reel statistical methods, TAPPI Journal Jun
ABSTRACT: Multiple statistical methods for calculating the variance partition analysis (VPA) of reel data have existed for decades. In the paper industry, VPA is also commonly known as reel statistics. VPA commonly consists of total variance (TOT) that is then divided into three components: cross direction (CD), machine direction (MD), and residual (RES). A common mathematical procedure is referred to as ANOVA (analysis of variance). TAPPI Standard Test Method T 545 “Cross-machine grammage profile measurement (gravimetric method)” addresses paper testing and includes the ANOVA equations that have also been used to analyze scanning data.In the 1990s, TAPPI published TIP 1101-01 “Calculation and partitioning of variance using paper machine scanning sensor measurements,” which contained simple formulas that were easy to implement and could be used by a nov-ice to generate statistics on a spreadsheet. All involved quality control system (QCS) suppliers agreed to support this common method in their QCS. TIP 1101 was recently revised, and this paper concerns the analysis of data collected from a scanning sensor in a QCS and the creation of a common method for the calculation of reel statistics by TAPPI’s Process Control Division.

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