What are attributes and variables in quality control?
In simple terms attributes control is at the limits, variables control within the limits.
Concerning the data that is generated by each concept, attributes data is discreet whereas variables data is continuous..
What are control attributes?
The controls attribute is a boolean attribute. When present, it specifies that audio/video controls should be displayed. Controls should include: Play. … Track (for video only, when available)
What are product quality attributes?
A CQA is a physical, chemical, biological, or microbiological property or characteristic that should be within an appropriate limit, range, or distribution to ensure the desired product quality. CQAs are generally associated with the drug substance, excipients, intermediates (in-process materials), and drug product.
What is variable in quality control?
A variable is something that you can measure – thickness, weight. An attribute is a binary property – cut or not cut, drilled or not drilled. You use both in quality control but a variable will give a bit more information and is easier to handle statistically.
What is difference between variable and attribute?
While an attribute is often intuitive, the variable is the operationalized way in which the attribute is represented for further data processing. The values are ordered in a logical way and must be defined for each variable. …
What are the two types of control charts for attributes?
There are two ways you can track the data: use the p control chart or the np control chart, depending on what you are plotting and whether or not the subgroup size is constant over time. The p control chart plots the fraction defective (p) over time. The subgroup size does not have to be the same each time.