1. victorxstc

    Nonparametric alternative to point-biserial correlation coefficient? - Which? t-test or Mann Whitney?

    A. I know from the net that for a design with one binary variable and a second variable that is continuous but is NOT normally distributed, I can use BOTH the point-biserial correlation (which is basically the parametric Pearson correlation formula) as well as the Rank Biserial Correlation...
  2. H

    Doubt with random numbers in parametric Bootstrap

    Hello all, Suppose I have a set of datas 8...20, with mean 10 and lambda 1/10=0.1 . I want to make a parametric bootstrap, supousing my datas come from an exponential distribution. So now I may construct my random samples from an exponential distribution with lambda=0.1 . My problem is I do...
  3. U

    Stochastic Frontier Analysis (SFA) or Data Envelopment Analysis (DEA)

    I'm trying to analyze bank efficiencies and come across two of the most used method of efficiencies measurement. I've studied many published papers on SFA and find some simplicity of the data that have to be used to run the method on statistical software. I wonder if anyone could enlighten me on...
  4. T

    Which statistical test to use for multi-modal and mixed type data?

    I researched for hours but cannot find the direction for the right statistical test to use. Here is the situation for Population A and B: When plotting this frequency distribution, it looks like this: My observations to this point: - Shape: Multi-modal - Data type: Discrete Additional...
  5. G

    Quantitative Risk Management, Log returns on Parametric Value at Risk

    Hello guys, i have this huge coursework which i have been working for a long time and the deadline is tomorrow, so far i have been able to answer everything but one question on which i would really appreciate the help. Basically one part of the coursework is to acquire historical data for a...
  6. N

    One way ANOVA vs Kruskal Wallis

    Hi, I am comparing four groups (measurements of bone thickness and other bone parameters). The distributions are normal (Kolmogorov–Smirnov test) and variances equal between groups (Levenes test). I have 7 samples in each group. As I see from the literature this would call for a parametric...
  7. M

    P-value - Parametric Vs Non-parametric

    Greetings Is it possible to compare the p-values derived from non-parametric tests to parametric tests? For example, lets say dataset 1: Copper concentration in spoil is not normally distributed, so I have to use a non-parametric test on it and get a p-value. Dataset 2: copper concentration...
  8. S

    Assumptions of linearity for parametric tests?

    Do parametric tests make assumptions regarding linearity? Whether yes or no, how can I explain this? It seems to me as though regression analyses assume linearity, but I can't seem to figure out whether these can be parametric tests or not. Many thanks!
  9. M

    Question about parametric and nonparametric tests and non-probability sampling

    I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have collected. My question is about non-probability sampling and the use of the aforementioned tests. To my knowledge, both parametric and...
  10. T

    parametric or non-parametric in comparison of a dependent variable within several gro

    down vote favorite I am comparing maths and chemistry scores of students in several schools. I am not comparing the schools with each other. I am just trying to say that students do better in maths than in chemistry in all of the schools studied. So I am comparing the maths and chemistry...
  11. L

    [SPSS - wilcoxon/paired t test] - not normally distributed data

    Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally distributed. When exlcuding data to make it normally distributed and thus use parametric tests, can we only exclude data that exceeds the limit of...
  12. J

    choosing the right statistical test for comparing data, when do you use which test

    Hello all, I would like some feedback on the right approach of analysing data, comparing means of groups of data. Currently I work with the following 5 steps to analyse my data. Is this approach correct or how do you analyse your data if you do it differently? 1) I test for normality...
  13. M

    Comparing a sub-population to its overall population?

    Hi there, I am collecting data from a population of about 150 or so, and also from a subpopulation within that of 10-15 which are receiving a specific treatment. I am aiming to compare their scores on the same measure, to see if this population receiving treatment is truly 'special' in some...
  14. P

    I'm Confused Between Independent T-Test, Mann-Whitney And Chi Square Test?

    hello everyone, i need your help regarding these statistical tests since i'm not really big on stats. i want to know if there are any significant difference between the two groups in my study. i'm confused which statistical treatment i will be using. here's a little background on my study. i...
  15. T

    Parametric or non-parametric test?

    Hi there, thanks in advance for any help you can give. I need to perform a correlation test between a parametric data set and a non-parametric data set: should I use a parametric test (Pearson) or a non-parametric test (Spearman's rho)? I'll be performing the analysis on SPSS.
  16. G

    How can you prove normal distribution enough to use e.g. ANOVA not Kruskal Wallis?

    Hi everyone, I'm trying to produce an automated framework for choosing hypothesis tests and carrying them out. I really am new to statistics so sorry if I'm asking really obvious questions, but I've tried for so long to find an answer and aren't getting anywhere. This also isn't homework help...
  17. I

    MS Thesis Topic Recommendations from Journals concentrating on Parametric Tests

    I would like to know if you can recommend sites where journals, particularly statistical researches, can be viewed completely. Alternatively, can you suggest recommendations based on your previous studies/research that I can work on and explore for a Masters Thesis. Any parametric method...
  18. P

    Do I need to worry about normality, if the DV is a 1-item 10point likert scale ?

    Dear all, I hope you can help me with the following question My design was a 2 x 2 with a single item measuring responsibility on a 10 point scale as my dv. However, my data is not normally distributed, and a number of standard transformations did not seem to help out here. That's why I was...
  19. R

    T-test vs nonparametric for likert scale (very small sample size)

    Hi everyone, I'm in the process of completing my masters thesis, and while I did my share of psych stats in my undergrad it's been YEARS and I'm a lil rusty! Any advice or help anyone could provide would be greatly appreciated, and you may even get a mention in my thesis acknowledgement...
  20. A

    Parametric or non-parametric test ?

    Dear the members of group. I have 2 questions regarding my research which has 8 variables in which 6 of them are normally distributed and the rest are not normally distributed. 1. Do I need to use parametric test for those 6 variables and non parametric test for the rest of two variables to...