Question: SPC XL is a statistical add-in for Microsoft Excel, SPC XL provides statistical analysis including Control chart, Process capability, Histogram, and Pareto chart, a chart that contains both bars and a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line, named after who?
Context: In the mathematical discipline of graph theory, the line graph of an undirected graph "G" is another graph "L"("G") that represents the adjacencies between edges of "G".  The name line graph comes from a paper by although both and used the construction before this.  Other terms used for the line graph include the covering graph, the derivative, the edge-to-vertex dual, the conjugate, the representative graph, and the ϑ-obrazom, as well as the edge graph, the interchange graph, the adjoint graph, and the derived graph. The line graph of a hypergraph is the graph whose vertex set is the set of the hyperedges of the hypergraph, with two hyperedges adjacent when they have a nonempty intersection.  In other words, the line graph of a hypergraph is the intersection graph of a family of finite sets.  It is a generalization of the line graph of a graph. A Pareto chart, named after Vilfredo Pareto, is a type of chart that contains both bars and a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line. Analyse-it is a statistical analysis add-in for Microsoft Excel.  Analyse-it is the successor to Astute, developed in 1992 for Excel 4 and the first statistical analysis add-in for Microsoft Excel.  Analyse-it provides a range of standard parametric and non-parametric procedures, including Descriptive statistics, ANOVA, Mann–Whitney, Wilcoxon, chi-square, correlation, linear regression, logistic regression, polynomial regression and advanced model fitting, principal component analysis, and factor analysis. In process improvement efforts, the process capability index or process capability ratio is a statistical measure of process capability: the ability of a process to produce output within specification limits.  The concept of process capability only holds meaning for processes that are in a state of statistical control.  Process capability indices measure how much "natural variation" a process experiences relative to its specification limits and allows different processes to be compared with respect to how well an organization controls them. SigmaXL is a graphical and statistical add-in tool for Microsoft Excel. Power Pivot is a feature of Microsoft Excel.  It is available as an add-in in Excel 2010 and 2013, and is included natively in Excel 2016.  PowerPivot extends a local instance of Microsoft Analysis Services Tabular that is embedded directly into an Excel Workbook.  This allows a user to build a ROLAP model in PowerPivot, and use pivot tables to explore the model once it is built.  This allows Excel to act as a Self-Service BI platform, implementing professional expression languages to query the model and calculate advanced measures. SPC XL is a statistical add-in for Microsoft Excel.  SPC XL is a replacement for SPC KISS which was released in 1993 making it one of the oldest statistical addons to Excel.  SPC XL provides statistical analysis including Control chart, Process capability, Histogram, Pareto chart, and ANOVA Gage R&R. Numerical Analysis for Excel (NumXL) is an econometrics and time series analysis add-in for Microsoft Excel.  Developed by Spider Financial, NumXL provides a wide variety of statistical and time series analysis techniques, including linear and nonlinear time series modeling, statistical tests and others. A bar chart or bar graph is a chart or graph that presents categorical data with rectangular bars with heights or lengths proportional to the values that they represent.  The bars can be plotted vertically or horizontally.  A vertical bar chart is sometimes called a line graph.
Answer: Vilfredo Pareto