Attribute vs Variable data  Discrete vs Continuous data

→ The difference between attribute and variable data are mentioned below:
→ The Control Chart Type selection and Measurement System Analysis Study to be performed is decided based on the types of collected data either attribute (discrete) or variable (continuous).
→ This data can be used to create many different charts for process capability study analysis.
→ It plays a very important role as a part of the Problem Solving Process.

What is attribute data?

→ It is qualitative data that can be counted or can be said as yes or no for recording and analysis.
→ The attribute also called "discrete" type and focuses on numbers.
→ It has two types: (1) Yes/No type (2) Counting type (i.e. no. of pieces, parts, or products)
→ For one item, there are only two possible outcomes: either it passes or it fails against the specification.
→ Each item inspected is either defective or not defective.
→ For example, suppose we are collecting data on defective products at our assembly line so the data simply classifies as defective or not defective.
→ A discrete data set is very simple to collect as compared to continuous data.

Examples of the Attribute data:

[01] Yes/No Type:
→ Mail delivered: is it on time or not on time?
→ The phone answered: is it answered or not answered?
→ Warehouse regular stock item: is it in stock or not in stock?
→ The invoice generated: is it correct or not correct?
→ Product confirmation: is it in-spec or out of spec?
→ The salesperson closed the deal or did not?

[02] Count Type:
→ Number of defective product per shift
→ How many students have passed the exam?

What is Variable Data?

→ It is observed or measured to any decimal place you want (if your measurement system allows it) and it is also called "continuous" type.
→ For example, as per the sampling inspection plan, we are taking one sample out of 10 parts and check the weight of it. So the reading should be in digit or number and variable like 250, 255, 248 grams, etc.
→ continuous data can tell us many things that discrete can not.
→ Suppose we are developing any new gear for an electric drive then attribute data tell us that is gear fixed with the drive or not? but with the help of variable data, we can check the performances of gear in various loading condition and we can define the safe working load.

Examples of Variable data:

→ The length, width or height of the product.
→ The density of the liquid
→ Weight of the product, etc...

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  1. Hello..
    Could you provide MSA technics and tools for attribute data?

    1. Thank you for your interest we will upload very soon

    2. Sir if possible u can post video's for better understanding or Excel example

    3. Sure we will try our best for this.

  2. Sir , need process details like welding , stamping like

  3. How to Calculate standard deviation for attribute data ? Kindly explain with example

    1. Thanks for your valuable inputs our team will work on that


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