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[ODP] Immigrant GPA in Danish primary school is predictable from country-level variab

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(2014-Nov-02, 22:39:48)Emil Wrote: The p value will only go down if the data are non-normal.


First, you say that p goes down only if the variable is not normally distributed. Then, you say it can go down if N is large (and you show it in your blog post). So, it's not "only if" the variabe is not normal. That's the problem I always pointed out.

(2014-Nov-02, 22:39:48)Emil Wrote: In the case of GPA here, however, it is not very normal. I tried log-transforming it, but it is slightly less normal after that (Ws .9251 before, .9124 after). What do you want me to do with it?


Sometimes, transformation does not work because the data follows a specific distribution (e.g., poisson). In such a case, use poisson regression. Sometimes, the data is truncated or censored. Then use truncated or tobit regression. You have used Spearman's rho, and it is a valid test here, given your histogram. But sometimes, even Spearman's test is not appropriate. Like I said, when you have censored, truncated or poisson distribution. Just because the data is not normal does not mean Spearman's test is the most appropriate solution. But of course, you can't see that with your S-W test. That's why I prefer histogram. S-W test cannot even tell anything about skewness and kurtosis. But histogram can do that. When you look only at S-W test, you will come to the conclusion that the data is not normal, and that Pearson's test is not appropriate. Correct. But when it comes to choose the best method, S-W fails badly. It cannot show you which method to apply.

For your article anyway, I will only ask that you note the data is not normally distributed, as indicated by histogram (and S-W test if you really want it) and then show that Spearman's correlation produces the same result. And I will approve. I don't think the analysis needs to be carried out even further. And I don't even have ideas. Pearson/Spearman is just sufficient.
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Messages In This Thread
[ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-02, 00:49:54
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-02, 03:13:04
Normality - by Emil - 2014-Nov-02, 05:37:41
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-02, 19:21:44
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-02, 19:32:02
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-02, 20:15:44
Shapiro test - by Emil - 2014-Nov-02, 22:39:48
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-03, 19:29:29
Spearman - by Emil - 2014-Nov-03, 04:17:20
Nonnormal - by Emil - 2014-Nov-03, 22:59:31
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-06, 01:32:32
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-06, 01:48:01
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-06, 02:46:26
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-06, 02:59:02
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-06, 03:57:07
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-06, 20:48:41
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-07, 02:31:06
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Nov-07, 20:24:16
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-09, 04:19:00
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-26, 19:38:54
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2014-Dec-30, 00:35:58
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-Jan-12, 22:12:58
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Jan-14, 14:28:28
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-Jan-25, 01:51:01
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Nov-27, 23:31:16
I have updated the paper to draft #4 - by Emil - 2014-Nov-29, 08:20:32
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2014-Dec-05, 01:19:52
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Dec-05, 10:54:41
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2014-Dec-27, 05:57:01
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Meng Hu - 2015-Jan-05, 19:33:18
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Peter Frost - 2014-Dec-30, 23:31:30
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Jan-14, 15:00:45
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Jan-13, 00:13:23
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Jan-25, 02:43:12
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Feb-02, 16:58:19
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-Feb-02, 19:21:15
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Feb-02, 20:34:14
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-Feb-02, 21:12:06
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Feb-03, 03:48:24
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Feb-05, 17:14:10
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-Feb-08, 03:52:29
Reply to John's #41 - by Emil - 2015-Feb-09, 04:15:15
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-Feb-11, 04:26:03
Draft #6 - by Emil - 2015-Feb-17, 05:04:22
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-Mar-12, 22:05:36
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Mar-13, 00:50:20
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Peter Frost - 2015-May-24, 18:13:12
Reply to Peter #47 - by Emil - 2015-May-26, 07:56:34
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Peter Frost - 2015-May-26, 18:42:03
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-May-26, 23:00:21
RE: [ODP] Immigrant GPA in Danish primary school - by Meng Hu - 2015-May-28, 08:32:30
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-May-28, 23:16:31
Reply to MH #51 - by Emil - 2015-May-28, 10:09:59
RE: [ODP] Immigrant GPA in Danish primary school - by Meng Hu - 2015-May-28, 17:34:38
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-May-28, 23:25:35
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Chuck - 2015-May-30, 19:52:15
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Jun-04, 14:36:24
RE: [ODP] Immigrant GPA in Danish primary school is predictable from country-level variab - by Emil - 2015-Jun-04, 18:15:24
 
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