statistical test

  1. S

    What test should be used to compare nominal data between 5 groups

    Dear All, I am a surgeon trying to investigate how indications for a device has changed over 5 years. I have the following data set for patients; I want to find out for each indication if there is a trend or a statistically significant relationship over the years. What is the best statistical...
  2. P

    Which Statistical Test To use?

    HI, I'm struggling to find out which statistical test is most appropriate to analyze the impact of negative interest rates on profitability; Data collected: Sample - 30 Banks Yearly data for each variable from year end 2007 to year end 2017 - 10 years Variables I'm considering are...
  3. L

    Which test (my goodness) shall I apply, please?

    Can you pleaase kindly help me with my scholarly article? (I spent lots of time by solving this issue - to no avail): I observed whether (and to what extent) the 52 SAME companies use their capacities across the years 2006, 2010, 2014, 2018. ----- Here are the counts of companies (categorized by...
  4. H

    Statistical Test for Two Populations Before/After Control/Test Design

    Hi, We are commonly have a problem where we do A/B test over a population of users but it seems like population sometimes differ even before the tests starts. So let's say I have over multiple days the KPI per group (control & test), how would you test for the treatment significance? This is...
  5. Yama Karimi

    Which test should be used with 1 dependent variable and 7 independent variables?

    Hello everyone I'm carrying out a research which tries to analyse factors affecting coffee consumption behavior, there are 7 independent variables on hand and 1 dependent variable which is coffee consumption behavior Is Multiple regression analysis can be used while there is relation among...
  6. A

    Which analysis

    Hello All, I am currently analysing my experimental data on postharvest storage of pears. Lets say that I had 2 fcators (light treatment and cold storage duration). First, light treatment with 3 level of lighting intensity (0, 30 and 50 micromole per second). I grew my pears in this 3...
  7. L

    Statistical test to assess the relationship between an independent and dependent variable of an experiment

    I am doing an investigation about the effect of altitude on the density of two tree species. Would it be possible to use the one-way ANOVA test to determine whether there is a statistically significant relationship between the density of beech and oak trees and altitude? If not, can low...
  8. L

    Choosing the proper statistical test for a lottery recommendation system

    Dear friends, I'm now working on the recommendation system to recommend football match lottery to the users. The users may choose a match to bet arbitrary amount of money, e.g. $2, $4, or even $20,000. I want to compare if two recommendation algorithms are different (or if one outperforms...
  9. J

    Confidence Interval in Statistics test

    Hi all, I just had a test with the following question, of which I doubt the 'correct' answer: Taking a level of significance of 5% in a hypothesis test and not rejecting the null hypothesis, is the same as saying: A. We are 95% confident that the results have occurred by chance B. We are 95%...
  10. C

    Graduate School Help - What test do I run?

    I am working on my independent action research project and need help figuring out what statistical test to use. I am looking at how my students' waste management knowledge and behaviors change pre- and post- survey. Usually, when I have done something like this, I run a paired t-test since...
  11. S

    Statistically significant changes in proportions - comparing 3 populations

    I have data from three populations, 2 observations each populations (opinion poll data from different countries). I am trying to find out if any changes in opinion on the issue i am investigating are statistically significant. So, for one topic In 2010, Group 1 answered 20% yes, Group 2...
  12. C

    comparing multiple means between multiple groups

    Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple sites. My supervisor asked me to determine whether there are any site specific significant differences in these means. I am thinking that I should run a...
  13. A

    Seek for Statistical Test of Variability Contribution Percentage of Multiple Factors

    Hi, I need statistical test which would tell me which percent of variability in dependent variable is from given independent set of variables and which of unknown ones. Example: Model: Y = Model (X1, X2, X3, ....) Measurements of Y, X1 and X2 are given. I need test which tells me the portion...
  14. E

    Statistical tests for panel data in SPSS

    Dear all, For my thesis, I would like to conduct a statistical test in SPSS to explain trade between the United States and 12 different regions, based on a couple of independent variables (both ratio and binary). I have seen that STATA is the best way to do this, however I have no experience...
  15. A

    What statistical test should be used?

    I've collected data on the number of individuals of seven species at three different sites and want to test if there is a statistically significant difference between the three sites. The numbers are too small to use Chi square and I cannot make a 2x2 table for the Fisher's exact test. Are there...
  16. S

    Statistical test for algorithm performance

    I am developing different algorithms for a class of optimization problems. I have several problem instances in this class (some from real applications, some randomly generated), which do not differ in terms of structure, but in terms of data. I would like to compare the performance of my...
  17. K

    Need assistance choosing the correct test for two nominal variables.

    Hi! I have a single sample and asked them to think about their best and worst experiences in a class project. They answered identical sets of questions when considering the best project and again when considering the worst project. Here are the question examples: When thinking about your...
  18. rogojel

    Model vs. test

    Hi, we just had an interesting discussion about the chi-squared test, that could be generalized. I think the core of the discussion was whether one should prefer a simple statistical test or a statistical model - e.g. a chi-squared test vs. a logistic regression. Given that in practice one is...
  19. A

    Pearson VS Spearman — Choosing and interpreting the test

    Hello, I need to fix the problem choosing and interpreting the correct statistical test for my data. I have data from (a) Minnesota Job Satisfaction Questionnaire short form (20 questions, answers from 1 (=very dissatisfied) to 5 (=very satisfied)) and (b) from Social Readjustment Rating...