Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [measurement]

Measurement is the assignment of a value (numeric or otherwise) to an observation.

343 questions
7
votes
3 answers

Measurement level of percentile scores

This one is bothering me for a while, and a great dispute was held around it. In psychology (as well as in other social sciences), we deal with different ways of dealing with numbers :-) i.e. the levels of measurement. It's also common practice in…
aL3xa
  • 2,201
5
votes
1 answer

interval or ratio?

I have a question about how to interpret some discrete data. Some are very easy, like the number of children in a household: that is a discrete and numerical, measured as a ratio variable. Other variables are not that easy, for example age,…
statstudent
  • 51
5
votes
2 answers

Does the interval/ratio distinction ever matter?

Statistical methods vary according to the measurement levels of variables, and it can make a difference if variables are classified as nominal, ordinal, or interval/ratio. But I've never seen any statistical test that depends on the interval/ratio…
Sean Raleigh
  • 252
  • 1
  • 11
4
votes
1 answer

Can statistics based on crude units of measure be improved?

I'm collecting online recipes in order to calculate average ingredient proportions for, say crepes or pastry. Most volume based units of measure in english recipes (cups, tablespoons, teaspoons) differ from country to country and sometimes differ…
Chris Steinbach
  • 41
3
votes
1 answer

Creating a meaningful statistic measure for physical geography

I'm writing a paper on the collapse of ancient agricultural terraces in the Mediterranean, and have come across a problem when trying to create a meaningful measure. I have sampled with a GPS terrace failure points, and mapped them with GIS. I have…
HDunn
  • 133
3
votes
1 answer

bilateral exchange rate volatility definition

I am trying to estimate panel gravity model and need exchange rate volatility between country i and j but I don't know how to do it, is it possible to use GARCH model in this case? or Moving average standard deviation? Would you mind helping me…
salimeh
  • 31
2
votes
2 answers

How many measurements should be done?

I am measuring time of a computer operation. The operation should run roughly same time each time I measure it. How many times should I measure it to get good average and standard deviation? originally posted here:…
Bogdan Verbenets
  • 121
  • 1
2
votes
2 answers

Is body temperature interval or ratio scale?

I understand that temperature is interval scale because it holds no true zero and can represent values below zero. But in case of body temperature it cannot go below a certain point and definitely not below zero. So in that case, will body…
Harry
  • 1,387
2
votes
1 answer

Is median or mean more accurate for technical replicates of assay (small n)?

If I want to improve the precision of the results of an assay by averaging a few repeat measurements of each sample, when the random error is generally normally distributed but occasional outliers are possible due to failures in the assay process…
Adi Inbar
  • 163
2
votes
2 answers

Is the level of measurement of variables always preserved?

Is it conceptually possible for multiple variables of lower level measurement (i.e. ordinal data) to be combined to i.e. interval data OR is the level of measurement always preserved? If asked, I would argue that the former is true. Example: The…
Comfort Eagle
  • 293
  • 2
  • 10
2
votes
1 answer

Validate precise scale with less precise scale

Is it possible to validate the measurements of a precise scale with a scale wich is less precise? Let's say I have a scale wich can display values down to 1g and another scale which can display the values down to 0.01g. I measure for example 100…
jrast
  • 71
1
vote
0 answers

How to treat data of one parameter measured with two same devices that show slight differences in averge

I have measured one parameter with two identical devices. Unfortunately one device shows higher values on average. Also maximum and minimum of the values differ by exactly the same value like the average. Can I just substract the mean difference…
Lara
  • 11
  • 1
1
vote
0 answers

Measurement of indipendent variables for binary logistic regression

I want to run a binary logistic regression to understanding (modeling) factors affecting nest-site selection in a bird species..I measured 32 presence points and 64 absence points. Instead of measuring random points as absence points, I measured…
Mostafa Ahmadi
  • 149
  • 7
1
vote
1 answer

How do I measure the performance of a model when only partial ordering matters?

I have a number of input data points $\{ x_0, x_1, \ldots, x_n \}$ and their corresponding outputs $\{ y_0, y_1, \ldots, y_n \}$. I also have two models $f, g : X \rightarrow Y$ that seek to estimate a partial ordering of the true outputs. That is…
sdasdadas
  • 113
1
vote
0 answers

Measuring true value in an interval accounting for contributions from neighboring intervals

Suppose I have a record of every purchase of food made in 2019 and 2020 and I want to answer the question: how much did I spend on food in March/April/May in those two years (to see how much I'm saving on food while on lockdown). I can easily just…
Joshua Frank
  • 233
1
2