TOOLS QUANTITATIVES

TOOLS QUANTITATIVES

1. PARETO CHART

   • A graphic technique, which consists of showing the most important problems in order to concentrate improvement efforts and determining in which order to solve them
     • The "Few Vital" (the very important elements in their contribution) 80%
     • The "Many Trivial" (the unimportant elements in it) 20%
   • Set priorities on time to act or where to start.
   • WHEN IT'S USED?
     • By identifying a product or service for analysis to improve quality.
     • In looking for the root causes of problems
       • Prioritize solutions

2. CONTROL GRAPHICS

   • It is a tool used to distinguish the variations due to errors or failures of some of the random variations inherent in the process.
   • Types
     • Variable control chart
     • Attribute control chart
   • What is it for?
     • Diagnosis: For assess stability of a process.
     • Control: For to determine when it is necessary to adjust a process and when it should be left as it is How is it going
     • Confirmation: To confirm the improvement of a process.
   • Graphic: -Upper limit - Central Limit -Lower limit

3. HISTOGRAM

   • Distribution chart of a data set
   • It serves to show the accumulation or tendency of the data
   • WHEN IS IT USED? It is used when studying a continuous variable, such as age bands or sample height, and, for convenience, its values ​​are grouped into classes, ie, continuous values.

4. DISPERSION DIAGRAM

   • graphical representation to discover the joint behavior of two variables
   • IN WHAT CASES ARE YOU USED? It is very useful for the solution of quality problems in a process and product, since it serves to verify which causes are influencing the dispersion of a quality characteristic
   • - Positive correlation: occurs when one variable increases and the other also.
   • - Negative correlation: when one variable increases and the other decreases.
   • - No correlation: there is no apparent relationship between the variables.

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