statistical analysis

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    t-test or any other form of statistical analysis?

    Hi, I am working on the below raw data and want to compare between control group vs various amino acid concentration level. I know, I can use T-Test to compare control vs each concentration level. Besides, the data is following normal distribution. The data is measured up to 10 days...
  2. M

    Matt Whiteny U test Vs T test

    Hello fellow statisticians, Problem definition: I need to test whether the difference between the "mean" utilization metrics of two machines is statistically significant. Given Data: Utilisation data is available for two machines for more than 100 days. Therefore, the mean, standard...
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    Calculating representative value for data

    Assume there are ten data with values a_1, a_2, ..., a_10 each with different non-symmetric errors. The problem confronting me in brief is, to combine the 10 results a_i and their associated non-symmetric errors according to some acceptable precept so as to determine the value of a and its...
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    Calculating ensemble value for data with non-gaussian errors

    I have 10 data points each of which have non-symmetric (i.e., non-Gaussian) errors. That is, if 'a' is the central value (representing the median), then a^{+b}_{-c} means that 'b' is the positive 1-sigma error and 'c' is the negative 1-sigma error. I want to be able to get a representative value...
  5. L

    which statistical tests to use?

    Hi, I am very new to statistics. I have some data that I would like to perform additional statistical analysis on it. The data is related to two groups of people. Group 1: control group Group 2: people with obesity Group 2 is following a healthy food plan. Measurements are being...
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    Chi Square or T Tests for Likert Scale Type Survey

    So I have a 4 point likert-type scale with approximately 20 questions. I have categorized each item to be either agree or disagree. I mainly did this because the previous person who used this scale did this. However, that person only displayed frequency data for it and did not run any tests for...
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    Which type of analysis should I do? HELP!! Dissertation Issues!

    Finally getting back to research for my dissertation after a 4 year break from the classroom!! need some help on which analyses are best for some of the following scenarios. Thanks!! 1-test the statistical significance of and type of relationship between a DV (scale level of measure—i.e...
  8. N

    Statistical analysis - Work Delay - Some tests relations

    Suppouse that we have a dataframe called dataWork with data from a database. There are several variables and 2 of them are: - Delay: time (minutes) to get to work (could be empty) - Nocturnal: 0 (work by day) 1 (work by night) we want to know the relation between delay and nocturnal. So...
  9. M

    Different samples

    Hello everyone I have the following doubt How can I prove that the data of different samples (sample 1 and sample 2) have similar behaviors? Graphically I can see that they have similar behavior, but how can I prove with a statistical test? I appreciate your answers Thanks so much...
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    Help with Statistical distributions

    Hello I have the following doubt, I hope you can help me, I really appreciate it - I have a population of 500 businesses - A sample of the businesses with the highest sales (200 businesses) - Each business can sell many products, but I would like to know the behavior of only one group or...
  11. S

    Need help in deciding whether to use parametric test or non parametric test ?

    I am working on an assignment. I have sample study of 9 participants suffering from a mental disorder and the participants mood scores are being measured at three time points after subjecting these participants to a new intervention.The mood scores are normally distributed. Should I run a...
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    Which analysis represents better the "worse-ness" of my linear regression?

    Hello all, If I have two sets of data points, for instance: 1 10 2 14 3 17 4 12 5 19 and 1 10 2 14 3 17 4 12 100 112 The linear regression is bad for the first set and good for the second, if you look at R^2, but it is still a bad line. I was told that...
  13. T

    2x2x3 Anova, what will it tell me?

    Hi - I would like to compare the means of a DV (emotional intelligence) between three different variables, those being; 1) Gender (are the emotional intelligence scores between males and females significantly different etc. etc.) 2) Group (again with two levels - one group with a disability...
  14. U

    Examine the effect of one independent var

    Hi, I want to examine the effect of still images (independent var) with two levels (monochromatic and multi-color) on mood perception (dependent var) of participants. What is the appropriate analysis I must conduct in this case? Furthermore, I conduct a regression analysis to examine the...
  15. D

    Which statistical test should be used?

    Take a quiz and refresh your knowledge in selecting the appropriate statistical test/procedure to answer a given research question. This assessment (25 MCQ+ brief demographic questionnaire) is designed for graduate students in social and behavioral sciences and developed as a component of a...
  16. P

    Pillai’s Trace

    Of the 4 test statistics commonly used for MANOVA why is Pillai’s Trace used most often?
  17. T

    Help with interpretation

    Hello everyone, I tried to do cluster analysis for my class, but I'm not sure how to interpret the plot I got. Can anyone help me with that please? Thanks, Tomer.
  18. H

    Which statistical analysis to run?

    Hi All, I'm currently working on my psychology project however, struggling with the results section; I'm not quite sure which analysis to run. My research is on problematic internet use and impulsivity. I have a questionnaire on problematic internet use which has 3 scales of obsession...
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    Policy chance analysis - time series count data

    Hi, I need some help to determine my approach. For a school project I would like to examine the effect of a policy change in the Danish registration law for certain cars, happening in june 2007. I have a dataset with the number of registrations pr. month from jan-97 to dec-15. If I put...
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    Statistical Analysis for Heart Monitors

    Hi everyone, I am an English person who's never taken statistics (yikes, right?). Well, now I'm working a job where I need some ideas of what kinds of statistical analysis might be used to make sure that medical devices (heart monitors in this case) are working properly. I'm writing a...