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Topics: Quality
Statistical Sampling, Attribute and Variable Sampling?
Network:429



How can i choose the right technique to measure the conformance of the deliverable. For example a company manufacturing water bottles 1000 numbers/day has decided to randomly select 100 bottles for inspection to measure the compliance? Does this is a statistical or variable or attribute? Please brief.
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Network:2332



Lenin,

attribute vs variable sampling is that attributes are present or not (yes if the bottle is heavier than 1000 grams vs no if not) but variables come out as a number in a range (e.g. weight of the bottle in grams). Variable sampling gives you more information (e.g. if there is a bias or a trend) but is more complex.

Both are statistical sampling, but different distributions and methods apply.

There are US military standard covering both MIL-STD-105 for attribute sampling, MIL-STD-414 for variable sampling. I implemented a program to analyse variable sampling for disk flight head testing in 1983, thanks for bringing up that memory.
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1 reply by Lenin Anbalagan
Apr 10, 2019 10:48 AM
Lenin Anbalagan
...
Thankyou Mr.Thomas.
Network:429



Apr 10, 2019 9:47 AM
Replying to Thomas Walenta
...
Lenin,

attribute vs variable sampling is that attributes are present or not (yes if the bottle is heavier than 1000 grams vs no if not) but variables come out as a number in a range (e.g. weight of the bottle in grams). Variable sampling gives you more information (e.g. if there is a bias or a trend) but is more complex.

Both are statistical sampling, but different distributions and methods apply.

There are US military standard covering both MIL-STD-105 for attribute sampling, MIL-STD-414 for variable sampling. I implemented a program to analyse variable sampling for disk flight head testing in 1983, thanks for bringing up that memory.
Thankyou Mr.Thomas.
Network:277



Lenin,
The first step is determining the attributes that are significant to the quality of your product (size, weight, material composition, etc.). Based on the key attributes, determine what quantifiable variables can you measure to evaluate the attributes. The water bottles are manufactured to some sort of specification, so examine the specification and determine the critical requirements, and then determine how you would measure them. It can be something as simple as a Go/No-Go gauge (does the bottle fit in the hole?) or much more involved such as measuring the composition of the plastic.

The attributes are the qualities of whatever the thing is that you care about. The variables are the quantified measures of the attributes. The statistics are the aggregated results of measuring the variables multiple times to determine the typical values and the variance in the measurements.
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1 reply by Lenin Anbalagan
Apr 11, 2019 11:49 AM
Lenin Anbalagan
...
Thank-you Mr.Keith.
Network:429



Apr 10, 2019 11:05 AM
Replying to Keith Novak
...
Lenin,
The first step is determining the attributes that are significant to the quality of your product (size, weight, material composition, etc.). Based on the key attributes, determine what quantifiable variables can you measure to evaluate the attributes. The water bottles are manufactured to some sort of specification, so examine the specification and determine the critical requirements, and then determine how you would measure them. It can be something as simple as a Go/No-Go gauge (does the bottle fit in the hole?) or much more involved such as measuring the composition of the plastic.

The attributes are the qualities of whatever the thing is that you care about. The variables are the quantified measures of the attributes. The statistics are the aggregated results of measuring the variables multiple times to determine the typical values and the variance in the measurements.
Thank-you Mr.Keith.

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