If I get this value of SW test is variable resid(lr3) normal distributed? Shapiro-Wilk normality test data: sample(resid(lr3), 5000, replace = T) W = 0.9953, p-value = 1.355e-11 -- View this message in context: http://r.789695.n4.nabble.com/Shapiro-Wilk-normality-test-tp4648236.html Sent from the R help mailing list archive at Nabble.com.
Shapiro-Wilk normality test
5 messages · Bert Gunter, Hard Core, Kevin Wright
1. Is this homework? 2. This is not an R question. Post to a statistical list list stats.stackexchange.com for such questions. 3. If this is not homework, I suggest you consult a local statistical expert, as your statistics knowledge appears minimal. 4. No variable is **ever** normally distributed. 5. Tests of normality are a waste of time (this is **my** opinion only). Cheers, Bert
On Fri, Nov 2, 2012 at 7:05 AM, Hard Core <gioxc at hotmail.it> wrote:
If I get this value of SW test is variable resid(lr3) normal distributed? Shapiro-Wilk normality test data: sample(resid(lr3), 5000, replace = T) W = 0.9953, p-value = 1.355e-11 -- View this message in context: http://r.789695.n4.nabble.com/Shapiro-Wilk-normality-test-tp4648236.html Sent from the R help mailing list archive at Nabble.com.
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Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
my knowledge of statistical is not minimal .. i was just a little bit confused because on wikipedia i read that the value of SW test 0 < w < 1. When w is very little then you're supposed to refuse null hypotesis. So in this case, considering the value of w i should accept null hypotesis, but p-value tells me the contrary. So i thought that i missed something in the formula. That's not homework .. -- View this message in context: http://r.789695.n4.nabble.com/Shapiro-Wilk-normality-test-tp4648236p4648276.html Sent from the R help mailing list archive at Nabble.com.
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Dear Kewin, this is just my issue. Take a look at this <http://r.789695.n4.nabble.com/file/n4648278/Rplot02.png> I have skewness = 0.16 and kurtosis = 3.3 ... This one seem to me normally distribued but both Shapiro-Wilk and Jarque-Bera test make me refuse null hypotesis of normality -- View this message in context: http://r.789695.n4.nabble.com/Shapiro-Wilk-normality-test-tp4648236p4648278.html Sent from the R help mailing list archive at Nabble.com.