Skip to main content
Figure 2 | BMC Research Notes

Figure 2

From: Quality assessment metrics for whole genome gene expression profiling of paraffin embedded samples

Figure 2

Arrays from the breast cancer case study were grouped into four quadrants according to their IQR range (IQR = Q3-Q1) and skewness (skew = (Q2-Q1)/IQR; symmetric distributions will have skew=0.5). Quadrant R1 consists of arrays with IQR>2 and skew>0.2. Quadrant R2 consists of arrays with IQR>2 and skew≤0.2. Quadrant R3 consists of arrays with IQR≤2 and skew>0.2. Quadrant R4 consists of arrays with IQR≤2 and skew≤0.2. The percent of the 1618 arrays that fall into each quadrant are summarized along the top of the figure. Panel (A) depicts pre-normalized intensity values; Panel (B) depicts the RLE metric.

Back to article page