correlation analysis

  1. R

    Power Analysis

    Hi there, I am currently writing a statistics report which has to cover 2 questions: Firstly, what the correlation is between two different test scores of 30 participants. Secondly, what the power of the study is. I am really struggling to grasp what the pro's of doing a post-hoc power...
  2. J

    Find Correlations

    Let's say I have some samples, that I gathered per second, like these Number km Benzine Speed Weight 1 10 100 80 100 2 20 90 100 120 3 30 80 80 110 with thousand of samples and more than twenty features (like speed and...
  3. I

    Ordinal survey, 2 groups: looking for correlation between groups

    Hi I have an ordinal data set across 50 survey questions (same response scale for each question). The data is non-normally distributed for each question, and isn't suitable for conversion to interval data. Much simplified example attached. I need to be able to test if there is a...
  4. J

    How do I test the significance of my correlation coefficients for various regressions

    Hi, I have a set of 25 points and I used a TI-84 calculator to calculate the linear, quadratic, logistic, exponential, and power regression models for this data set. I have, likewise, obtained the r^2 value for each of these regressions. Some of these r^2 values appear to be quite similar. For...
  5. E

    Need Help with Correlation

    Hi, I am trying to figure out the best way to calculate correlation with data I have for my business. Here is an example of what I the fields: Sale Amt - numeric Sold - yes or no State - lists 1 of 50 states Industry - lists the industry of the buyer Lead Source - lists where the lead...
  6. T

    Correlation

    I have a list of 100 observations. One variable describes the sex of an individual (male or female); the other variable describes the number of times the individual blinked during the observation. (30) of the (100) observations are with men and (70) are with women. Sample sheet attached. How do...
  7. R

    Using Generalized Estimated Equations (GEE) to analyze correlations?

    I have repeated measures data (meaning 3 measures per type of animal for one treatment only; there are 2 types in total) that are unbalanced. There are 2 treatments. Additionally, these animal 'types' are nested within group, which are nested within a cage. Now, because of the difficulty of...
  8. P

    Using R to study temporal alignment

    Hello, I'm new to R, and not a stats specialist at all. For an user experiment, I've collected data. My data consists in 2 variables. The first one, v1, is ponctual in time. The second one, v2, is continuous. Both variables are coordinates. I want to use R to study the temporal...
  9. T

    Urgent help needed: can I take mean of correlation coeficients?

    Historic market (Cash) prices and future contract prices are available for last 4 years. I have found correlation between Jan'11 market price with Jan'11,Feb'11 and March'11 future contract prices separately.I am planning to do the same for all months till Dec'14. So I will have 3 coefficients...
  10. T

    How to find correlation coefficients for periodic data?

    Please help: Correlation coefficients for periodic data? I am working on a hedging model for commodity.I have past 36 months data of commodity market price and future contracts price. e.g. on 1st April,2014, market price is x,April contract price = x+1,May contract price = x+2 and June...
  11. S

    Mann Whitney U test and Spearman test using GraphPad prism 6 interpretation

    I have analyzed two biological sample (Soil 1 and Soil 2) by Mann-Whitney U test and Spearman test using GraphPad Prism 6 software. I got following result For Mann-Whitney test Table Analyzed One-way ANOVA data Column B Soil 2 vs. vs. Column A Soil 1 Mann Whitney test P value < 0.0001 Exact...
  12. P

    Type of analysis to be used - Important because I have a deadline :(

    Hello, I am writing my thesis on innovation management which involves a survey analysis. I am using SPSS statistical tool to perform this analysis but right now I have a blocking point in the type of analysis being used? All the questions were all based on scale between 1-7 (1:completely...
  13. T

    Price forecasting model

    I am working on a problem where I have an item 'x' which is available in local market and 'x' is produced using item 'y'.Item 'y' is traded in futures market.I have historic price data available for last 2 years of both items. I have to forecast prices of x for next year. What should be my...
  14. S

    Which test to use? Correlation or Regression

    Hi, I need some help with choosing the statistical analysis. Details of my study. all participants will complete surveys measuring self compassion, whether their psychological needs are met, how high on non attachment scale they are and other trait scales. then, Half will be given some...
  15. P

    [Correlation Analysis] Information on entering and analyzing Likert-scale data

    Hi, I am a Psychology student seeking advice for using SPSS (version 21). My research question is whether personality traits (extravertedness, agreeableness, etc.) relate to organisational commitment (OC). Both questionnaires are on a Likert-scale format (the personality measure has 5...
  16. B

    MBE, RMSE of two series of data, correlation.

    I have a series of Data generated as output of a mathematical model which I already know the MBE and RMSE (real measured values and simulated ones by the model) Afterwards I used the same input for the previous model but for another model, but i do not have the real-measured data, that means...
  17. S

    link data collected from two surveys collected from both managers and subordinates

    Hi guys I badly need some help for my masters-level dissertation please. I have two surveys which i collected the data via Qualtrics. Both surveys have elements taken from the literature, highly used, reliable and valid so nothing is new. Questions in both surveys are in a matrix form - well...
  18. A

    How to run trend correlation of multiple subjects? (Beginner)

    Hi! I have a set of data which looks similar to the below Y1 Y2 Y3......Y20 Branch Sales Profits Sales Profits a x1 z1 x4 z4 b...
  19. O

    Finding correlation of independent variables with a response variable in R

    I have a set of independent variables X1, X2, X3,..., Xn and a response variable Y. I want to perform some form of data analysis in R so that I only select a subset of those independent variables that have more significant effect on the response variable Y. I want to generate results that should...
  20. W

    Comparing Data from Value-Based Scales with Frequency-Based Scales

    I was recently asked to correlate scores between two surveys that supposedly measure similar constructs. One has a value-based scale (very like me, somewhat like me, neither like or unlike me, somewhat Unlike me, very unlike me). The other has a frequency-based scale (never, rarely, sometimes...