Normality tests fail on single long tail; suggestion.
Posted: Mon Feb 10, 2014 6:57 am
I'm not sure where to post this, but since it's a half baked suggestion I put it here. I noticed a few days ago that Normality tests included in Eviews require the series to be centered around the mode, otherwise you get rejection of H0 even when you shouldn't. So I was wondering if you could add a good-faith effort on Eviews part to try and clip the series such that only the significant part of the series is kept, in pseudo-code:
find mode
restrict sample to the x such that x >=mode/1000
perform Normality test
reset sample to what it was before
I believe Stata does its tests requiring the cumulated series, not sure if this helps solve the problem of asymmetric tails.
Example of strange test results in Eviews 8. I have a Binomial, 80% of a 0 result and 20% of a strictly positive result, repeat 30 times, I get a series that I call N30. I call N30trunc the hand-truncated version around the mode, and Norm01 is a short normal slightly off-center. The regression shows that the binomial is essentially Normal. Thank you for all your efforts, I really enjoy using Eviews.
find mode
restrict sample to the x such that x >=mode/1000
perform Normality test
reset sample to what it was before
I believe Stata does its tests requiring the cumulated series, not sure if this helps solve the problem of asymmetric tails.
Example of strange test results in Eviews 8. I have a Binomial, 80% of a 0 result and 20% of a strictly positive result, repeat 30 times, I get a series that I call N30. I call N30trunc the hand-truncated version around the mode, and Norm01 is a short normal slightly off-center. The regression shows that the binomial is essentially Normal. Thank you for all your efforts, I really enjoy using Eviews.