Create and interpret a residual plot

01

Press these keys

2ndY=Xlist:L1Ylist:RESIDZoomStat

02

Walkthrough

1
Run regression
Calculate the chosen model first so the RESID list is populated.
2
Configure plot
Set a scatter plot with Xlist L1 and Ylist RESID (2nd → STAT → NAMES → RESID).
3
Inspect
Use ZoomStat. Random scatter around zero supports the model; a pattern suggests mismatch.

03

Worked example

After a linear regression, plot RESID against L1.

NORMAL FLOAT AUTO REAL MPpoints above and below y=0no clear curve for a good linear fit

AnswerJudge fit from the residual pattern, not from a single residual.