variables

  1. N

    ANCOVA dilemma

    Hi All, Ive been given this question: Categorise the participants into high stress and low stress groups. Compare the two groups in relation to another psychological variable while controlling for a second variable. The data i have available (which i don't need to use all) is age, gender...
  2. A

    One IV, two DVs, across male/female. What could I use?

    I know I've been posting a lot here lately, this is my last one: I have one independent variable (categorical) and want to determine its effect on two separate dependent variables. I know I could use MANOVA for this. But what do I use if I want to determine the effect of an independent variable...
  3. M

    Can I use chi-square for one nominal and one ordinal variable?

    Can I use chi-square test of independence if one variable is nominal and the other is ordinal, or do both have to be nominal?
  4. M

    Choosing the correct analysis

    Hi everyone, Really needing help with choosing the right analysis for my variables. Background: I'm looking at the difference in amplitude for reaction times of negative, positive, and neutral words. The IV: reaction times (negative, positive, neutral words) The DV: amplitude...
  5. D

    How determine if control variables moderate the IV/DV relationship in SPSS?!?!

    I just finished basic SPSS analysis of data I recently collected that has 1 DV, 2 IVs, and 8 control variables (age, race, level of education, etc). I cannot for the life of me figure out how to test the control variables for moderation in SPSS. I feel like I recently did it, but cannot...
  6. T

    Mediation Analysis Multiple Independent and Dependent Variables with process tool

    Hi all, I am currently looking into the process tool by hayes. I have installed it and would like to have more than 1 independent and dependent variable. Is there any way to add more than one independent and dependent variable? The tool only allows 1 for each in spss. If not, can anyone...
  7. M

    Help with normal distribution

    Hello friends of the forum I have the following doubt ... If I have a sample of only 24 discrete data, how can I prove that these data follow a normal distribution? When I enter the data into a specialized software, the software tells me that the sample fits a normal distribution, but I'm...
  8. L

    Extract Values from Output in for loop

    Dear community, i am currently trying to extract the four parameters of a fitting output/call: This output will be generated around 5000 times. And i need the highlighted values in a seperate table. My for loop is: Thanks for any advice. Kind regards, Luca
  9. O

    (SPSS - new variable) Combining

    Hello everyone. I have a social survey data set with 500 respondent answers. A question asks about social networks, where each respondent can name up to 10 relationships they have. Each relationship has it's own variable. A question asks does this person live in the same country as you? I...
  10. S

    Which Statistical test to use?

    Can someone tell me the statistical tests I could use with the following variables. Independent variable categorical (high, medium, low) Dependent variables are categorical, and some are dichotomous What parametric (for large samples) and what non-parametric (small samples) could be...
  11. L

    PCA Analysis - Factor Analysis gave only 1 column?! Need to do a scatterplot!

    I am conducting a PCA on my dataset which has four scale variables (duration, %, rate 1, and rate 2) to see if they contribute to a single component. I conducted a factor analysis and it created only one column. When I have conducted PCA before, I have been given two columns by which I was able...
  12. F

    Change variable PDF with less variables than before

    My question is very simple, I have a probability density function that depends on four variables p(x1,x2,x3,x4). Now each of those variables depend on three new variables, i.e xi=xi(y1,y2,y3) so I want to find the new PDF given by p(y1,y2,y3). The problem is that the jacobian of this...
  13. P

    Create new variable in R dataframe by counting values equal to or greater than 1

    Hi, I have a dataframe in which I need to create a new column by counting all values equal to or greater than 1 occurring row-wise. I tried to use the following command: length(which(birds[2, 3:29] > 0)) This command only returns a value for ONE row (in this case, the 2nd row)...
  14. K

    subsetting data with criteria involving multiple variables/combinations of variables

    Hi, I am trying to create a subset of data of “high intermediate risk” group of entries as defined by a criteria based on age and number of risk factors. It is: Age over 70 plus at least 1 risk factor Age 50-70 plus at least 2 risk factors Age under 50 plus all three risk factors The...
  15. A

    Regression - What to do with insignificant variables?

    Please pardon me if you find this question very silly but this doubt has been troubling me for some time now whenever I want to run a regression. I am working on SAS. I have a dataset which has 24,000 observations, and there are about 50 independent variables. There are no missing values...
  16. T

    Operations Research - Does the independent variable affect sales dollars?

    Does the independent variable affect sales dollars? I have five branches in my company. Each branch has a showroom. Each showroom does not have the same mix of items. Some items are in all showrooms, some are in a few, and some are just in one showroom. I want to see if an item's sales...
  17. J

    Binomial Random Variables

    Hey guys! I'm having some real trouble with these questions. Any help would be greatly appreciated! Thanks in advance (: 1.) A baseball player has a lifetime batting average of 0.183. If, in a season, this player has 250 "at bats", what is the probability he gets 29 or more hits? Probability...
  18. M

    How to check if two categorical variables are related (in a two-way table)? Confused

    Hi, My question might seem pretty dumb but I'm teaching statistics to myself and never had in school or uni. I use a book and I'm currently trying to learn the chapter about two-way tables with two categorical variables. In the book, it is written that you can check if two categorical...
  19. M

    Is there a difference between z-score and effect size?

    I just started teaching statistics to myself (I never had it in school but will need it when I start University). I have problems with z-scores and effect size. I think that you use a z-score if you want to know how a score compares to the mean or standard derivation. And you use the effect...
  20. Eaners

    How to "stack" variables

    Say that I have performed a survey in which I have asked subjects to use a three-item, five-point Likert scale to rate three scenarios. My data would be formatted to look something like this (Sx indicates scenario, Ix indicates item): Subject S1_I1 S1_I2 S1_I3 S2_I1 S2_I2 S2_I3 S3_I1 S3_I2...