That cautions and notes helped me gain perspective a lot bcs in my normality testing i found out that my data are normal according to KS test but significantly differ to normal distribution according to shapiro wilk, (0.002 significance value). It’s really confusing it’s almost like they analyze different data. It made sense now that it has different results due to large sample (>100) just as you cautioned which made the shapiro wilk too sensitive to reject the null hypothesis. Thanks.
Do you mean in R? I'd look into the apply() function to run shapiro.test on multiple columns at once. However, species abundance counts rarely follow a normal distribution (there's an enormous literature on abundance distributions like log-normal, etc.).
![Normality test [Simply Explained]](http://i.ytimg.com/vi/AVketBmpUTE/mqdefault.jpg)
![Normality test [Simply Explained]](/img/tr.png)
That cautions and notes helped me gain perspective a lot bcs in my normality testing i found out that my data are normal according to KS test but significantly differ to normal distribution according to shapiro wilk, (0.002 significance value). It’s really confusing it’s almost like they analyze different data. It made sense now that it has different results due to large sample (>100) just as you cautioned which made the shapiro wilk too sensitive to reject the null hypothesis. Thanks.
Great video!!
Just one question what was "ai" in the formula?
Excellent! Thank you.
very good explanation!
Thank you!
Is there a reason why S-W test will encounter problems when it have many repeated data points?
Is this Tony Stark?
what's a_i in the equation at time 2:57?
Nice video. So the data has to be continous, but is there any way I can use this test on a discrete data?
Thanks
Interesting test nice problem solving
Why normality tests? Why dont we implement poissonity test? What makes normal distribution privileged among other distributions?
central limit theorem
@@sanjuktaganguly1334 thank youuuu
Hi can you guide me how to use shaphiro whilk in abundance data with lots of columns to see if diversity follows normal distribution??
Am i the only one who found this unhelpful??
how to obtian ai?
observation to observation?
Cmmon
use python or some graphics to show the result
Can you explain each variable means thank you its for our thesis and we need to pass. Thank you for your help in advance
Not that good explanation
Hi can you guide me how to use shaphiro whilk in abundance data with lots of columns to see if diversity follows normal distribution??
Do you mean in R? I'd look into the apply() function to run shapiro.test on multiple columns at once. However, species abundance counts rarely follow a normal distribution (there's an enormous literature on abundance distributions like log-normal, etc.).
thanks a tonn!! i will have a look!! :)