Within computational biology, an MA plot is an application of a Bland–Altman plot for visual representation of genomic data. The plot visualizes the differences between measurements taken in two samples, by transforming the data onto M (log ratio) and A (mean average) scales, then plotting these values.

MA plots are commonly used to represent log fold-change versus mean expression between two treatments (Figure 4). This is visually displayed as a scatter plot with base-2 log fold-change along the y-axis and normalized mean expression along the x-axis.

MA plots are a widely used way to visualize genomic data. The M represents the difference between two conditions (fold-change), while the A represents the average intensity of the expression.

Mar 13, 2023 · MA plots show the differential expression and expression levels of multiple genes at the same time. This makes them more visually useful than volcano plots (which only show differential expression).

What is MA plot? ¶ MA plot shows the log average (A) on the -axis and the log ratio (M) on the -axis. Here, M stands for minus because Similar plots are Bland-Altman plot, Tukey mean-difference plot, mean-difference plot, or MD plot. This type of plot is good to show the data distribution between two individuals or two groups. Examples include:

Make MA-plot which is a scatter plot of log2 fold changes (M, on the y-axis) versus the average expression signal (A, on the x-axis). M = log2(x/y) and A = (log2(x) + log2(y))/2 = log2(xy)*1/2, where x and y are respectively the mean of the two groups being compared.

MA-Plot (visualizes log intensity-dependent ratios) of normalized intensities of colon aRNA after GFP spot exclusion, background correction, print-tip lowess, within and between array normalization.

Feb 6, 2022 · MA plot visualize and identify gene expression changes from two different conditions (e.g. normal vs. treated) in terms of log fold change (M) on Y-axis and log of the mean of normalized expression counts of two conditions on X-axis.

A MA plot is a graphical representation of the log ratio and average of signals, where the vertical axis represents the difference between the logarithms of the signals and the horizontal axis represents the average of the logarithms of the signals.

An MA-plot is a plot of log-intensity ratios (M-values) versus log-intensity averages (A-values). See Ritchie et al (2015) for a brief historical review. For two color data objects, a within-array MA-plot is produced with the M and A values computed from the two channels for the specified array.