wilcoxon signed-rank test

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    Statistical Method Help!

    Paired data statistical method help? I have a set of data that I would like to test a hypothesis against (H0: Mean Difference = 0 vs. H1: Mean Difference <> 0). I have a time 1 and time 2 data (paired data) after some form of treatment. n=65 and scores range from 0-10. My data is non-normal and...
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    Which analysis for a survey question asking how frequently a group do an activity ?

    I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want to find out which lens or lenses are the most commonly used for each type of photograph. There were four lens types and five types of photographs...
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    Wilcoxon Signed rank test, Students's T-test, or a mixture of both?

    Hello! For my dissertation I am looking at the temporal order of physiological and behavioural events before a voluntary action. I have 12 different repeated measures variables including: Time of intention (W), Readiness potential 1 (as measured by task A) Readiness potential 2 (task A), RPmax...
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    Non-parametric statistical test with two nominal variables

    Hello everyone,:wave: I have the following data: feces density of a carnivore species subdivided according to sex. I am looking for appropriate test suggestions. I have calculated the density according to main habitat types, topography, and road types. To determine if results are...
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    Wilcoxon Signed Rank test - the best test to use?

    Hi - could anyone help me with this please? I am trying to choose the best statistical test for a problem I have - I am looking at rainfall anomalies for E. Africa and evaluating how ocean modes influence them (ENSO and Indian Ocean Dipole). I have seasonal averages for every Spring (so one...
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    Is Wilcoxon Sign Rank the appropriate test?

    Hi - could anyone help me with this please? I am trying to choose the best statistical test for a problem I have - I am looking at rainfall anomalies for E. Africa and evaluating how ocean modes influence them (ENSO and Indian Ocean Dipole). I have seasonal averages for every Spring (so one...
  7. S

    Question about Rank Sum Test

    The file CO2.csv contains information about the CO2 uptake of trees in two locations. The first few lines of the file are > co2[1:5,] Type uptake 1 Quebec 16.0 2 Quebec 30.4 3 Quebec 34.8 4 Quebec 37.2 5 Quebec 35.3 > Perform a nonparametric test to determine if the uptake is the...
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    wilcoxon signed-rank test to compare 2 pseudo-randomized distributions?

    Hello I need help to find the good statistic to use to compare two distributions of data coming from pseudo randomized trials. I have recorded some activity of different entities while a subject was performing a task with 4 conditions: A (start on the right, stay on the right), B (start on...
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    Trouble with Wilcoxon signed rank test - please help

    Firstly...I'm an absolute stats novice. I am assessing the urinary toxicity of a procedure by comparing baseline and 6 week International Prostate Symptom Scores (IPSS) for 10 patients. I am applying the wilcoxon signed rank test - however through all my "googling" there appears to be 2...
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    Unpaired or paired test?

    Hi, I have been doing the following experiment: I have recorded the startle amplitudes triggered by two different sounds - this is for one nice little rat called Roger. The sounds (12x S1 and 12x S2) were randommly distributed like this: S1 - S1 - S1 - S2 - S2 - S1 - S2 - S2 - S2 - S1 - S2 -...
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    How to run Wilcoxon Signed Rank Test of two groups in SPSS 18

    Hello, I would like to run Wilcoxon Signed Rank Test in SPSS 18 for the following data: There are 50 runners in the sample. I tested their pulse BEFORE the run. Some of the drank an energy drink from type 'A'. The rest drank an energy drink from type 'B'. I tested their pulse AFTER the...
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    Wilcoxon signed-rank test - Can I use for this case?

    Hello guys, I'm trying test if the results of a measurement variable (obtained with observation) is significantly greater than a other (obtained with random process). For the observed, I have an algorithm that returns a number. For the random I use the Bernoulli process, that returns another...