Statistics ForumStatistics and data analysis discussions. All things statistics.Wed, 18 Jul 2018 23:56:22 +0000Wed, 18 Jul 2018 23:56:22 +0000Statistics Forum
http://www.statisticsforum.com/
Neyman-Pearson LemmaMon, 16 Jul 2018 14:41:43 +0000
http://www.statisticsforum.com/threads/neyman-pearson-lemma.3140/
http://www.statisticsforum.com/threads/neyman-pearson-lemma.3140/invalid@example.com (Dr Frankenshroom)Dr FrankenshroomI am having trouble on finding. K.
Ex: given sample size n=1 for geometric didn't. Use NP to find critical region H0:x=x0. Ha :x1>x0
L0/L1=x0/x1((1-x0)/(1-x1))^y-1 <k
Since x1>x0 monotone decreasing and L0/L1<1
Since this the geometric dist , it is based off geometric sequence so the function that maximizes it
is
Sum [n=1 to c] ar^n=x0(1-x0^c)/(1-x0)=

Suppose n>1 what then ?]]>0Canonical Correspondence Analysis: how to interpret resultsThu, 12 Jul 2018 11:09:34 +0000
http://www.statisticsforum.com/threads/canonical-correspondence-analysis-how-to-interpret-results.3139/
http://www.statisticsforum.com/threads/canonical-correspondence-analysis-how-to-interpret-results.3139/invalid@example.com (zwergje)zwergjeHi, I am using Canonical Correspondence Analysis (CCA) to analyze phytolith abundances (similar to pollen) over environmental gradients. As I am new to CCA, I read some background info. The following section from explains how to look at the visualization of results (Buttigieg & Ramette, 2014):

How to relate samples and taxa to environmental gradients in a triplot
To assess the impact of the environmental gradients on samples or taxa, they should be projected orthogonally on the...

Canonical Correspondence Analysis: how to interpret results]]>0How to interpret GEE parameter estimate for Multinomial Ordinal DataFri, 06 Jul 2018 20:45:45 +0000
http://www.statisticsforum.com/threads/how-to-interpret-gee-parameter-estimate-for-multinomial-ordinal-data.3138/
http://www.statisticsforum.com/threads/how-to-interpret-gee-parameter-estimate-for-multinomial-ordinal-data.3138/invalid@example.com (cloudbob)cloudbobI have the following experimental design. There are four diet charts (A, B, and C, D). For each diet, a group of 25 subjects (1, 2, 3…25) was on each of those four diets. And they are supposed to rate each diet on the color, taste, and overall balance on the Likert scale from 1 to 5 as an attribute. So say for taste, each of the subjects would rate their experience for each of the four diets with 5 being “great” and 1 being “worst”. Given that we can expect some level of correlation because...

How to interpret GEE parameter estimate for Multinomial Ordinal Data]]>0univariate significant variables only for multivariate binary logistic?Fri, 06 Jul 2018 10:09:33 +0000
http://www.statisticsforum.com/threads/univariate-significant-variables-only-for-multivariate-binary-logistic.3137/
http://www.statisticsforum.com/threads/univariate-significant-variables-only-for-multivariate-binary-logistic.3137/invalid@example.com (marilynliddell)marilynliddellI have to do a binary logistic regression with one categorical dependent variable and several categorical and continuous independant variables. When i enter all these independant variables together i get several significant variables. However, if i run a one way anova initially for each independent variable separately and then select only the significant ones for the binary logistic then very few are significant. My doubt is which method is corrrect?. Several articles are selecting only the...

univariate significant variables only for multivariate binary logistic?]]>0Linear regressionThu, 05 Jul 2018 21:46:22 +0000
http://www.statisticsforum.com/threads/linear-regression.3136/
http://www.statisticsforum.com/threads/linear-regression.3136/invalid@example.com (Erika_Hammerl246)Erika_Hammerl246Hi,

I have fit 100000 linear models, M ~ age + age^2, where M is a frequency.

I found 5,000 models were significant, but would like to narrow it down to find the most ‘extreme’ cases.

Is this possible? Does anyone have any suggestions or any references that may help?]]>0Matched case control analysisMon, 25 Jun 2018 11:31:21 +0000
http://www.statisticsforum.com/threads/matched-case-control-analysis.3135/
http://www.statisticsforum.com/threads/matched-case-control-analysis.3135/invalid@example.com (Sonia Menon)Sonia MenonIf a study used a matched case control design ( matched on age, gender and proximity) should a Mc Nemar be used instead of a Chi square test? Or can one check for dependency (correlation) betwween matched pair using the GEE and GLMM results assuming independent and Exchangeable working correlation structure, and if this is not significant, can one proceed with a Chi square test?

"]]>0Proportion of a gene mutation across different age groupsWed, 20 Jun 2018 09:04:50 +0000
http://www.statisticsforum.com/threads/proportion-of-a-gene-mutation-across-different-age-groups.3134/
http://www.statisticsforum.com/threads/proportion-of-a-gene-mutation-across-different-age-groups.3134/invalid@example.com (luke_hats)luke_hats0 down vote favorite

Hi everybody!
I am trying to analyze in SPSS if there a significant difference in the proportion of a gene mutation among different age groups (20-29, 30-39, etc).
I codified the age groups from the continuous var (age) into a nominal variable with values 1,2,3,etc for each age group and the gene mutation with...