# Attribute or Variable

Six Sigma – iSixSigma Forums Old Forums General Attribute or Variable

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• #53199

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Hi,
I have a process where a client raises a ticket requesting information or other. Our teams works on the same and closes the ticket by providing the right resolution. Our software tracks the ticket requested time and closure time. Difference is what we call as TAT.
Now since the Time is tracked and calculated by software automatically, will my Y i.e., TAT is attribute or variable?
I understood that a variable data can take a range, whereas attribute data cannot. Since in my above case it cannot take any range when measured as it is done my software, how should I consider the same i.e., variable or attribute.

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#188918

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Hi,
I have one more doubt. A variable data can take any value in a range or can be broken down into smaller parts and still have meaning. Correct?
One of my process generates defects. I am counting the same and these are attribue data. Using the count of defects I am calculating the percentage defective using the formula (Defects/Produced)*100. Now since the result can also be broken down into decimals, should I call the percentage defective as Variable data? Same in the case of accuracy, using the formula (1-Defects/Produced)*100, should I call accuracy as variable or attriute?

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#188919

Stewart
Participant

Is this Homework?

What do you mean, cannot take any range, since software collecting/tabulating?

Time or lengths (time between start & complete) are Variable data types, does not matter if software collecting or not.

Examples of Attribute are (Male/female, heads/tails, Y/N), categorical type data.

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#188920

Participant

Attribute data is more of a non-linear description – Red, Green, Blue … Yes – No / Pass – Fail … short – medium – long.Do you mean Continuous or Discrete?Time can be treated as either – Depending on your situation, your gauge/measurement.How does your software report the results. In minutes (discrete) or decimals of minutes (continuous)?
How are you going to use the results / measurements?
If you have a requirement to close all calls within 5 min, you can convert your minutes to Attribute data based on + / – 5 min. But you lose a lot of valuable information doing that (imho)

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#188921

Create
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Hi,
Yes I mean continuous or discrete.
My software reports the reults in Hours:Minutes:Seconds format.
I am taking the difference of Closed Time – Received Time and the result will also be in Hours:Minutes:Seconds format. Hence it is clear in this case that the data is continous.
But can you please provide me answer for my second question i.e, % defective and accuracy.

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#188922

Participant

Better than that – I can provide you with a whole thread on Percentages:https://www.isixsigma.com/forum/showthread.asp?messageID=157705 . . found via google

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#188924

Mikel
Member

Variable

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#188925

Create
Participant

Hi stan,

Can you please explain the logic?

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#188931

MBBinWI
Participant

yes, Stan, please explain the logic.  My instructor won’t accept just a one word answer.

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#188932

Stevo
Member

What are you trying to do with the data?  Because most likely, it won’t really matter.
Stevo

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#188935

Mikel
Member

The question was – is TAT is attribute or variable?I answered the question correctly. I am not sure logic applies.Create – if you choose to struggle with such simple stuff, you should
probably find another line of work.

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#188943

Create
Participant

hi stan, I thought you have given the answer as variable for % defective or accuracy. Hence I was asking the logic.

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#188945

Mikel
Member

WRONG

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#188949

Create
Participant

Hi Stevo,
I am understanding the tool selection process. In Minitab15, tool selection process flow it is mentioned that Anova can be used only if the respone is continuous.
Let us say I am interested to do an analysis between process wise accuracy and want to see whether there is any statitical difference between the procsses accuracies or all of them are the same.
Let us say the Y i.e., accuracy is discrete and as processes also are discrete, hence we need to use Chi-Square. But if we conclude that accuracy is continous and as processes are discrete, Anova can be used. But I need to be fundamentally right before I jump in using the tool.

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#188950

Truth Teller
Member

Apparently none of the brain trusts have directly answered your question regarding the count of defects. Here are some thoughts:1. Ratios of discrete data are still discrete regardless of the number of decimal places you have.
2. Counts of defects follow a Poisson distribution. At around 14 or so, the Poisson distribution can be approximated by the Normal Distribution and the counts can be treated as continuous. It is still discrete but falls in that gray area allowing you to use the assumptions of continuous.
3. The same for proportion defective. As the proportion approaches .5 the binomial distribution can be approximated by the normal and again can be treated as continuous. The underlying data is still discrete but you can treat it as continuous with care.

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#188952

Truth Teller
Member

Before you go jumping into the use of ANOVA you better be sure that you validate the assumptions otherwise your conclusions will be suspect. This may be a challenge is you are using discrete data and treating it as continuous. You may be better off with nonparametric tests depending on your data.

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#188955

Mikel
Member

Hint – there is no concluding that a factor is continuous, it is or it
isn’tCorrect answer for the original question is variable and it is also
continuous

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#188956

Mikel
Member

Which question are you answering. The first has nothing to do with
the second.I think this guy is confused.

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#188958

Truth Teller
Member

The question regarding time is clear. Time is continuous unless you do something stupid and convert it to discrete. For example “on time” or “late”. Although the underlying data is still continuous it is now reported out as a binary discrete value. The question I was answering is this one:”One of my process generates defects. I am counting the same and these are attribue data. Using the count of defects I am calculating the percentage defective using the formula (Defects/Produced)*100. Now since the result can also be broken down into decimals, should I call the percentage defective as Variable data?”

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