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Hi Sindy,

Length for example is continuous you can get any value 3 3.1 3.1235 3.12323455333

But if you measure the length in the centimeters only (3cm, 4cm, 5cm) it is a discrete variable.

the number of children is discrete, you can't have 3.123 children in the class.

Length for example is continuous you can get any value 3 3.1 3.1235 3.12323455333

But if you measure the length in the centimeters only (3cm, 4cm, 5cm) it is a discrete variable.

the number of children is discrete, you can't have 3.123 children in the class.

Wait until you try to understand the difference between interval and ratio scaled continuous data.

It is common for one discipline to adapt something developed in another and give it a new name. This causes me great confusion when reading in different discipline. Often I am not sure what they mean.

I call survival analysis cox proportional hazard (regression)

Wait until you try to understand the difference between interval and ratio scaled continuous data.

Somebody may define the discrete/continuous only per the true nature of the variable, I can understand the logic of such definition, but is there such a definition?

PS, is the Interval/ratio relevant only for the

Hi Miner,

Somebody may define the discrete/continuous only per the true nature of the variable, I can understand the logic of such definition, but is there such a definition?

Somebody may define the discrete/continuous only per the true nature of the variable, I can understand the logic of such definition, but is there such a definition?

PS, is the Interval/ratio relevant only for the **continuous **variables? My common sense (only) say it should be relevant also to discrete variables.

"Note that the categories are not as clear cut as they sound. What kind of variable is color? In a psychological study of perception, different colors would be regarded as nominal. In a physics study, color is quantified by wavelength, so color would be considered a ratio variable. What about counts? If your dependent variable is the number of cells in a certain volume, what kind of variable is that. It has all the properties of a ratio variable, except it must be an integer. Is that a ratio variable or not? These questions just point out that the classification scheme appears to be more comprehensive than it is."

Good question. The problem is, where do you find a truly authoritative source for the answer?

But practically you can use the continuity correction for a

So practically you are correct

Very interesting question. I ran across the following comment while researching it:

"Note that the categories are not as clear cut as they sound. What kind of variable is color? In a psychological study of perception, different colors would be regarded as nominal. In a physics study, color is quantified by wavelength, so color would be considered a ratio variable. What about counts? If your dependent variable is the number of cells in a certain volume, what kind of variable is that. It has all the properties of a ratio variable, except it must be an integer. Is that a ratio variable or not? These questions just point out that the classification scheme appears to be more comprehensive than it is."

"Note that the categories are not as clear cut as they sound. What kind of variable is color? In a psychological study of perception, different colors would be regarded as nominal. In a physics study, color is quantified by wavelength, so color would be considered a ratio variable. What about counts? If your dependent variable is the number of cells in a certain volume, what kind of variable is that. It has all the properties of a ratio variable, except it must be an integer. Is that a ratio variable or not? These questions just point out that the classification scheme appears to be more comprehensive than it is."

I would treat "color" for

The reason I think Interval/ratio is relevant also to discrete variables - you can say that 4 children are dobule than 2 children, and the distance between 4 children to 6 is the same as from 23 children to 25. so we can say that the children variable is

I can't think of a discrete variable which is only Interval. (but it is too late now ...)

So few things are inherently interval (and things we think of as ordinal might be measured on an interval scale in some cases).

Wait until you try to understand the difference between interval and ratio scaled continuous data.

Hi Miner,

Somebody may define the discrete/continuous only per the true nature of the variable, I can understand the logic of such definition, but is there such a definition?

PS, is the Interval/ratio relevant only for the**continuous **variables? My common sense (only) say it should be relevant also to discrete variables.

Somebody may define the discrete/continuous only per the true nature of the variable, I can understand the logic of such definition, but is there such a definition?

PS, is the Interval/ratio relevant only for the

Good question. The problem is, where do you find a truly authoritative source for the answer?

Very interesting question. I ran across the following comment while researching it:

"Note that the categories are not as clear cut as they sound. What kind of variable is color? In a psychological study of perception, different colors would be regarded as nominal. In a physics study, color is quantified by wavelength, so color would be considered a ratio variable. What about counts? If your dependent variable is the number of cells in a certain volume, what kind of variable is that. It has all the properties of a ratio variable, except it must be an integer. Is that a ratio variable or not? These questions just point out that the classification scheme appears to be more comprehensive than it is."

Very interesting question. I ran across the following comment while researching it:

"Note that the categories are not as clear cut as they sound. What kind of variable is color? In a psychological study of perception, different colors would be regarded as nominal. In a physics study, color is quantified by wavelength, so color would be considered a ratio variable. What about counts? If your dependent variable is the number of cells in a certain volume, what kind of variable is that. It has all the properties of a ratio variable, except it must be an integer. Is that a ratio variable or not? These questions just point out that the classification scheme appears to be more comprehensive than it is."