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Questions tagged [significance]

231 questions
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Why doesn't a decision tree result in the same significance as a Chi-square test?

I’m fairly new to decision trees. When I do a Chi-square test between a binary, categorical variable and family size, I get the following p-value and subsequent pairwise p-values from post-hoc analysis using the Bonferroni control method in the…
Naim
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significance of confidence intervals: how to know when the confidence intervals are significantly diffeernt from each other?

In my effect plot I have 2 treatments and their confidence intervals. How can I know when the difference between the groups (treatments) aren't significant anymore based on the confidence intervals plotted?? aka: based on the calculated 95%…
blondie
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effect plots: how to add legend, change text size and add significance levels?

Me and some friends need to 'upgrade' a GLM and LMER plot. we need to add the significance levels, change text size and legend position. how do we do this in the "allEffectsplot"?? it needs to look somewhat like this graph (the right image is the…
blondie
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Custom Tables: How does SPSS treat multi response sets differently from categorical vars?

SPSS treats multi response sets differently from categorical vars when it comes to z-tests in custom tables. I assume that this behaviour is linked to the overlap of the responses, but I cannot figure out how. So, how does SPSS do z-testing when it…
nilsole
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Wilcoxon rank sum results: same pvalue over and over?

I'm comparing pairs of column data with the wilcoxon rank sum test and I was getting the exact same pvalue for the majority of comparisons. I was wondering if judging from the data whether I made a mistake or everything is alright. Here are some of…
A D
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SAS GLIMMIX subject estimates

I am trying to analyze a dataset where each subject has 12 repeated measures (quarterly over 3 years). I want to extract subject specific estimates of the time slope to evaluate if the subjects are changing significantly over time. The code I…
aisley
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Statistical significance of a nls model in R

I have some multiple linear models without intercept like below: Y = a*X1 + b*X2 + c*X3 However this model is a linear model, but since it does not have an intercept we have to write it as a non-linear model in R: model1= nls(Y ~ a*X1+b*X2, data =…
user3904453
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How do I add significance stars to a custom LaTeX table from R?

I have a data frame of the format: PartitionA PartitionB HA HB IAB pval All Kingdom 5 3 2.3 0 All Phylum 5 4 3.1 .09 The p-values in the last column are associated with the column IAB. I am trying to convert this into a…
Eli Sander
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Matlab survival curve log rank test

I am trying to do survival analysis in matlab and want to calculate log rank test scores among several curves. I found a possible code to do log rank here. But based on its description, it can only do log rank test between two groups. What if I have…
lolibility
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R: Stepwise Regression using P-Values to Drop -- setting the level?

Does anyone know the stopping rule when I use the step() function in R with the test = 'F' option? I.e., I'd like to set a significance level at which to stop the procedure. Currently I do something like this: m.full = lm(score ~ .,…
Adam
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significant differences between means

Considering the picture below each values X could be identified by the indeces X_g_s_d_h g = group g=[1:5] s = subject number (variable for each g) d = day number (variable for each s) h = hour h=[1:24] so X_1_3_4_12 means that the value X is…
gabboshow
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How to know the significance of coefficients and model in Weka?

I have been using R to model data using linear regression. And using the "summary(model)" command, it will provide details of coefficients significance and model significance (F-statistic). Can Weka provide such measures?
Thomas Lee
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Comparing two algorithms on a single dataset using total cost - Which statistical test to use?

I have to run three different kinds of comparisons between different data mining algorithms. The only type of comparison that is problematic for is the most basic one, two algorithms on a single data set - is the problematic one for me. I am aware…
ateich
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Determine importance of individual variables in WEKA

I am trying to determine the importance of individual variables in the WEKA implementation of an LMT(Logistic Model Trees) DT (Decision Tree). I would like to know the contribution that each individual variable has in a classification task, hence…
owwoow14
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WEKA SMOreg classifier significance testing

I am using the SMOreg classifier in WEKA to determine if there is a predictive relationship between one variable and several other variables. I am using 10-fold cross-validation to get my results. My teacher wants me to find the confidence of my…
user1181577
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