multiple regression

  1. M

    Does my predictor in my multiple regression have too many variables?

    So I am trying to work out what is the best predictor of a) awareness over environmental issues, b) concern over environmental issues and c) pro-environmental behaviour from a set of sociodemographics (eg. age bracket, political standing, location etc) measured using a survey. I am using a...
  2. S

    Multiple regression of categorical variables

    Hi everybody. I am almost new to statistics. I have some categorical features of a group of patients. some of these features are nominal( with 2 Levels) and some are ordinal (mostly with more than 4 levels). I analyzed the association between every two features by "Pearson chi-square test of...
  3. N

    Help with creating a model!?

    I want to create a model that assesses the effect of Drone usage (binary) in transporting medical samples to laboratories on Treatment Success (also binary). I was thinking: Dependent: TS = treatment success, so either successful or unsuccessful. Independent: TAT = turnaround time = the...
  4. E

    Multiple regression - Two independent variables

    Hi, I was given the following task in a course: You examine the influence of the two variables QS and TR on the variable WF. You have estimated the following relationship: WF= - QS - TR + 4QS • TR + ε WF is your dependent variable. The variables QS and TR are your independent variables. ε is...
  5. S

    How are multi-categorical variables used in multiple regression analysis?

    Hello everyone, I am working on the following file. I want to categorize absenteeism at my company as age, seniority, diagnosis, machine group, and month. I will use these parameters and perform multiple regression analysis, but when I separate them as follows, I cannot meet the sufficient...
  6. F

    On assessing predictors importance in a small sample

    Good evening. My question regards the "best" and correct way of finding out which predictors are best for determining an outcome of interest. I currently have a very small sample (45 patients), a number of continuous variables (20) describing patients hearts' characteristics and a three-levels...
  7. T

    How is conditional main effect interpreted when there is interaction?

    I have a question about multiple regression. May I kindly ask how should I interpret the conditional main effect when the interaction is 0 and the coefficients have opposite signs, more specifically if one of the interaction term contains zero such as angle or time. Please see an example...
  8. T

    How to interpret coefficients for multivariate regression model if main effect is either significant or not while the interaction is significant?

    Dear All, I have performed multiple regression model which consists of main effects and interactions. May I kindly ask how should I interpret the equation in case the main effect is either not significant or significant while interaction is significant. Please see my end model and equations...
  9. shannahw

    Normally distributed errors assumption is violated (multiple regression)

    Hi guys, I am testing the normally distributed errors assumptions for multiple regression with a visual inspection using a P-Plot plot. Now, I have the suspicion that the errors are not normally distributed (see image below). I have two questions about this: Is there any way to test this...
  10. R

    Help deciding which spss functions to use

    I'll start off saying that stats in general has never been a strong point for me :D The variables i am using are; Gender Age Relationship Status Number of dependants Profession Neuroticism (Higher score = higher neuroticism) Affectivity (Higher score = positive; lower...
  11. L

    Sufficient linearity between predictor and response variables?

    Hello everyone, for a multiple regression I am currently trying to understand if there is sufficient linearity between my predictor and response variables to see whether I can carry on with a regular linear regression. I have three models, with one dependent and the same three...
  12. D

    Help with data analysis plan for dissertation

    Any help would be much appreciated :) For my research project I'm hoping to do a moderation analysis and will be looking at if Variable M moderates the relationship between Variable X and Variable Y. All variables are continuous (scale) and were measured at only 1 time point. My 3 hypotheses...
  13. M

    Fit review for multiple systems

    Hello everyone Im new here so I hope I dont get anything wrong. But heres my question: I am writing my Bacherlors Thesis one chapter of said thesis revolves around finding a better fit to my data than the Van-Deemter equation H(u)=B/u + C*u So after looking through some Data I found about 6...
  14. L

    Multiple Linear Regression results

    Hi guys, I've run a hierarchal multiple linear regression with two predictors and one outcome variable, however I don't understand my results. I've found predictor A to be a significant predictor for my outcome variable alone. However, when both my predictors are in the model, predictor A is...
  15. E

    Calculating F-Value in multiple regression model

    Dear all, I am currently studying for my exam econometrics and i cant find a formula on how to calculate an F value. This is the question: Suppose someone is interested in the relationship between the UK real consumption growth (∆Ct), real income growth (∆Yt) and the growth in real investment...
  16. A

    What statistical test do I need to use for a moderator variable?

    For my study, I'm trying to test whether a variable acts as a moderator between the relationship of two other variables. I read that I should use moderational multiple regression with an interaction effect. However, I heard you can only use it if the moderator variable has 2 categories/ is...
  17. G

    Variable as confounding if it influences other factors in opposite directions?

    I examine the relationship between population density (PD) and the insurance density (ID) taking into account different market exploitations (ME) of an insurance company in municipalities. The correlation matrix (Pearson) shows the following relationships (all high signifikant): PD vs. ID (-)...
  18. souha2018

    Herarchical three-level (Multilevel) generalized linear logistic regression repeated measure with nesting/crossing using glmer in R

    I have been trying to find out the most adequate glmer formula for my data but I found no example that reflects my specific structure as illustrated above. My data is dichotomous [correct/incorrect (0,1)] for vocabulary tests: So here is what I have: Subjects Response as DV Time...
  19. T

    FINDING THE SS IN ANOVA TABLE

    Hi All! I've been trying to manually calculate the sum of squares for 2 independent variables in an ANOVA table and can only seem to work out two total sum of squares exaplianed by the two independent vairables. Is there any way that I can work out how many sum of squares is attributed to each...