266a3862_art_III___Stats_With_Cats_Blog__Identification
[Your Model] Not Enough Samples [Correction] Collect more samples. 100 observations per variable is a good target to shoot for although more is usually better. [Identification] 
If you have fewer than 10 observations for each independent variable you want to put in a model, you don’t have enough samples.
Regression Fantasies: Part III | Stats With Cats Blog
Identification