multiple

  1. 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...
  2. M

    Help with Correlation

    Hello! I need help for an issue i have. Let's assume that we have data of two variables (X and Y) for 14 different people. We can find the correlation between those two variables, for each one. In my case i find moderate correlation in some of them (which is also stat. significant), and for...
  3. A

    Multiple Linear Regression (Actual Vs Predicted)

    Hi forum, I am new to statistics and R in general so please bear with me if I am not clear enough. So I am generating a 3 level full factorial design with 4 variables (P, P1, P4, INJ), and three responses (qo, qw, qg) which I am using in order to run a multiple linear regression on in R. I have...
  4. S

    Std. Error Multiple Regression Question

    Hi guys, I'm stuck at interpreting the stadard error. In single regression it's clear, it's just the average distance from the line. But I don't really understand what this looks like in multiple regression. Does the standart error depend on the estimate or do I have to look at it in an...
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    Which method is the best to assign samples into groups

    I have 100 samples, each of which has an real value of 1, 2, 3, or 4 for a characteristic (say C). I'll develop a few methods (say X, Y, Z) to measure C. I generated data like this, hypothetically: sampleName, expected_value, observed_value_by_X, observed_value_by_Y, observed_value_by_Z S1...
  6. R

    Multiple mediation test with two waves of mediation

    Hi. I am trying to figure out how to test for mediation in this more complex model. The fact that I am new to mediation does not make it any easier. However, I would very much like to know, how you would approach a model like the one attached? All the variables are measured on a 7-point...
  7. P

    Comparing data from multiple samples - which model?

    Hello My job is to measure electrical characteristics of transistors e.g. onset voltage or threshold voltage. Every wafer I test has roughly 4000 transistors, and I measure many characteristics for each. I perform weekly experiments where I change a variable. I want to know if variable...
  8. M

    Extend economics thesis with multivariate analysis

    Dear all, Working on my Master Thesis I got the remark from my supervisor that I have to extend the research with a multivariate analysis. I have been looking at literature, text books and different forums how to approach this, but could not find any usefull sugestions. If anyone could help...
  9. U

    2 independent categorical variables. What test do I use?

    Sorry if this has been asked before, if it has I couldn't find it. Also excuse me if I mix up terms, I'm a bit of a novice. My experiment had two categorical independent variables. 1.)The feeding history of the fly (protein fed or sugar fed) 2.)The type of substrate tested for preference...
  10. S

    Representing a MLR equation on its matrix form

    Hi everyone, So my teacher was showing us how to find the B coeficients of a Multiple Linear Regression equation (Bo+B1x1+Bnxn) using matrixes and he told us to use this chart to represent the equation in the matrix form but I don't understand how to use it. Supposedly, with this chart you...
  11. A

    Multiple Regression with Discrete and Continuous data in Excel

    Hi, I've got lots of rows of data in Excel (around 3,500), and multiple variables. 1 of my variables is continuous (company revenues) 1 of my variables is a Yes or No 3 of my variables have a few (3-5) discrete options The output is money (continuous). I'm trying to use Excel to find...
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    Multiple Lineair Regression - Interaction Terms

    Hi all, At the moment I have a multiple regression with 2 variables and and interaction term. y = exchange rate changes x1 = macroeconomic news surprises x2 = speculative net positions x3 = macroeconomic news surprises*speculative net positions My question is: Do net positions affect...
  13. A

    How to interpret a standardized multiple regression coefficient

    How can I write an interpretation of the standardized multiple regression equation for both Age of Child and Number of Siblings in this model: ToM^ = 0.68TELD – 0.11Age + 0.45Siblings The dependent variable is Theory of Mind ̧ and the three independent variables are TELD (Test of Early...
  14. N

    Panel data graphs in STATA using by command

    Hi i am trying to make graphs using stata of panel data, with alot of stocks. The by variable i have to use is stock name, so that i get a two way line plot of a stock price and date for every stock in the panel data. The problem is when i use stock as the by variable, stata produces 400...
  15. T

    Multiple Regression interpretation

    y=β0+β1x1+β2x2+β3x3 Price = year + (difference between actual miles and average miles, x-xbar) + (year * difference between actual miles and average miles, year(x-xbar)) I am looking at this regression formula, but I don't understand what is going on. Could someone explain it a bit better to...
  16. S

    Multiple Regression Number of Variables and Predictors?

    Hi Could someone please help me with this question I've been staring at my textbook for hours and it doesn't explain how to find no of variable or predictors.. A researcher gathered 155 observations on four variables: job satisfaction, occupation, industry, and marital status. She wants to...
  17. C

    how to find mistakes in the multiple regression study

    Hello everyone, I'm working on eye-tracking papers related to reading. I'm currently studying this paper http://www.ncbi.nlm.nih.gov/pubmed/14622063 and trying to find mistakes they made in it. What I'm specifically looking for is: could this study have been done in a different way & is...
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    problems with hierarchical partitioning using R statistics and the hier.part package

    Hello after struggling with using R for the last couple of days I was hoping someone could help me with a statistical analysis I am completing for an environmental science honours project. Using R statistics is not something we have been taught and I am worried that I may have bitten of more...
  19. R

    Merging three datasets with multiple instances of uniqe identifier

    I am attempting to merge three datasets that were passed down to me and I am at a bit of a loss. Two of the datasets contain results for psychological instruments and the third contains basic admission statistics. The final analysis goal for the merged dataset will be to examine the...
  20. C

    Raffle with many entries per person, many prizes, limit one prize per person

    Consider a raffle for which each person may buy any number of tickets. There are many prizes but each each person may only win one prize. What is the probability that person k will win a prize? To make this more concrete, I'll work with some numbers. The following contestants enter the raffle...