Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [bland-altman-plot]

The Bland-Altman plot is used to analyze the agreement of different assays or methods of analysis. Outside of medicine, analytical chemistry and biostatistics, this plot is usually known as a Tukey mean difference plot.

The Bland-Altman plot consists in plotting the difference between the two assays against the mean of the two assays on each sample. This thread and this thread discuss its interpretation.

29 questions
14
votes
3 answers

How does one interpret a Bland-Altman plot?

In Plain English, how does one interpret a Bland-Altman plot? What are the advantages of using a Bland-Altman plot over other methods of comparing two different measurement methods?
Mike Richardson
  • 173
  • 1
  • 1
  • 7
12
votes
5 answers

What ways are there to show two analytical methods are equivalent?

I have two different analytical methods that can measure the concentration of a particular molecule in a matrix (for instance measure the amount of salt in water) The two methods are different, and each has it's own error. What ways exist to show…
PaulHurleyuk
  • 1,549
  • 3
  • 16
  • 18
8
votes
2 answers

Creating and interpreting Bland-Altman plot

Yesterday I heard of the Bland-Altman plot for the first time. I have to compare two methods of measuring blood pressure, and I need to produce a Bland-Altman plot. I am not sure if I get everything about it right, so here's what I think I know: I…
Oldboy
  • 83
  • 1
  • 3
8
votes
3 answers

Bland-Altman (Tukey Mean-Difference) plot for differing scales

I find that Bland-Altman plots for comparing two methods are extremely useful in assessing agreement. However, I'm curious if there is a similar method or transformation that can be used when the scales of the two methods are not identical, but…
Ashe
  • 1,085
  • 10
  • 25
6
votes
1 answer

What is an "Unpaired Bland-Altman plot"?

I found this quote: Unpaired Bland-Altman plots were used to check systematic or bias errors in the SPECT myocardial uptake coefficients with respect to the reference standard PET data. in the following paper: ALHASSEN, Fares, et al.…
Alessandro Jacopson
  • 699
  • 9
  • 25
5
votes
1 answer

Proper name for "modified Bland–Altman plot"

My lab uses what our PI calls "modified Bland–Altman plots" to analyze regression quality. I'd like to know what the generally used name is for these plots. A Bland–Altman plot compares the difference between two measures to their average. The…
Arya McCarthy
  • 6,390
  • 1
  • 16
  • 47
5
votes
2 answers

Can I use ICC and bland altman plot to study agreement of small data?

I have data set with small sample size, like 10 pairs of continuous data. I checked out kappa and percentage agreement, both seems not appropriate for agreement analysis. Can I stick to use ICC and Bland Altman plot? Any opinions are welcome.
sara
  • 51
  • 1
4
votes
2 answers

How to "prove" that new measurement tool & process gives same result as old?

I am new to the area of statistics and I am hoping you can suggest methods I may use. Sorry if this is long but I might as well be as clear as possible on my first post :) What I am worried most is that I may miss out on assumptions and draw…
bitbox
  • 91
  • 3
4
votes
2 answers

Evaluating TAs grading

Let me introduce the context: I need to evaluate how my TAs tend to grade students. Ideally I would like to pinpoint whether they show some sort of internal consistency (e.g., a TA usually grades almost always above/below a reference grade, or is…
Alexis
  • 41
  • 2
3
votes
0 answers

Is there a name for a differences versus differences plot?

I'm aware of the Bland–Altman plot where the differences between two measures of a given parameter (obtained with two different methods) are plotted against their averages. What I need to plot, are the differences between two measures of parameter…
Gabriel
  • 3,072
  • 1
  • 22
  • 49
2
votes
1 answer

Repeated measures mixed model correlation between measurements

I am interested in looking at the correlation between two types of heart function measurements over time. test1 can be considered the true value. The true value (test1) changes over time, but not much whereas test2 changes a lot. The hypothesis is…
User LG
  • 77
  • 6
2
votes
0 answers

Comparing two sets of limits of agreement (continuous outcome) - R

I am planning an analysis where I will have children and parents rating the child's pain (numerical score). For each child, I will have a child pain score and a parent pain score. The dyads will grouped by SES, high vs low. I want to know if high…
Matthew
  • 420
  • 6
  • 15
2
votes
1 answer

Bland & Altman plot for repeated measures using one measuring device

I am examining the reliability of a measuring device by measuring a force generated på test persons 7 days apart using R. In order to assess this properly I want to make a Bland & Altman plot that takes into account that it is the same device I am…
Kristian Kiim Jensen
  • 23
  • 3
2
votes
0 answers

Comparing measurements obtained from >2 devices (Bland-Altman, Tukey mean difference plot)

I would like to compare different measurements in regard to agreement. Quite often this is done using a Bland-Altman plot (also called Tukey mean difference plot) in medical literature. What I would like to do is compare more than 2 devices…
Ihkavs
  • 51
  • 1
2
votes
1 answer

What are the tests to measure agreement between two methods of measurement when the unit of measurement is different between the two methods?

Bland-Altman plot measure the agreement between two different methods which measures the same variable. As far as I understand Bland-Altman can measure only if the two methods have the same unit of measurement. I want to measure the agreement…
Padmanaban
  • 21
  • 1
1
2