HI I trying to understand better the plots below.
Only have small sample size of 21 observation in data using. I not see anything drastic maybe but for thick tail in qqplot
Does this mean that linear model should not be use? Many thank.
I trying to better interpret these question, and really want to understand.
Please could you give feedback. Thankyou
YES, you are correct in interpreting the dignostics plots for the regression model.
First plot - Residual vs Fitted
They are randomly distributed with reference to mean line of zero hence theyare not forming any constant pattern. Hence the Error Variance is remain constant.
Qqplot - The qqplot showing that the tail is thik but there may be chance that the regression fit is good.your data points are less hence the plot can be seen in that way.
But it is not the case that you can not use linear regression.
You may proceed with linear regression.
HI I trying to understand better the plots below. Only have small sample size of 21 observation i...
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