# regression analysis

1. ### How to find: Best fit regression Model

Thank you so much in advance!
2. ### Regression Using Likert Scales (Total Scores)

I conducted a survey that consisted of 5 different likert scales. I totaled the scores for each scale. I would like to know if the total scores of 4 of the scales serve as predictors of the scores on the 5th scale. I am struggling to determine which regression method, if any, is most...
3. ### Multilevel Analysis with Intercations

Hello I'd like to do a regression analysis with interactions, my data has two levels (school classes ans pupils). My variables are: Predictor = dummy variable on Level 1, dependent Variable = metric on level 1, moderator variable = metric, Level 2 I used the following command, but I am not...
4. ### Multiple imputation on categorical (dummy coded) data

Hello, I have a question regarding multiple imputation for categorical variables, and hope very much that someone can answer me. I am using SPSS 20.0. So, I have a few categorical variables with several levels (for example, color, with blue, red, green, and yellow as levels) and have...
5. ### Stepwise regression model with dependent variable categorical (help)

Hello , Can I use the step wise regression model with a categorical dependent variable? Is coding the dependent variable as 0 or 1 is enough to import it to the model
6. ### Regression analysis with independant variable (error) and multiple dependant variable

So I took a lot of data (~10000) on a machine (3D printer). For each reading, I got the error and a lot of different parameter (speed, voltage, angle, temperature etc.). My first analysis showed me that none of the parameter clearly explain my error, but a correlation is clearly visible...
7. ### How to determine number of data points and period of data to determine confidence?

Dear Statisticians I have done some experiments, with continuously data acquisition, on shrinkage measurements over time. My data shows exponential regression curves. Based on the data I want to estimate how many data points and at what time the data should be gathered, to obtain a certainty...
8. ### Analysis of a longitudinal study where interventions are received at different times

I have a data set of university students. The university has 8 different assisting programs, mostly like scholarships, for needy students to help them concentrate on their studies. Since it costs a lot of money for the university to run these programs, it opts to evaluate how effective each of...
9. ### Understanding ordinal regression

Hi! This is a really simple question, but one for which the answer continues to elude me! I understand that in a binary logit regression the resulting logit is the probability of an event occurring, defined as Ln(P/1-P) However, in an ordinal logit, in which there are multiple...
10. ### Scaling variables in regression

If you need to scale variables in order to get the correct effect size and beta weight for each variable, does this mean you also scale for both categorical and continuous variables? For example: Model1=lm(DV ~ X + Y + Z) In the above equation, is it correct to scale for x/y/z or would...
11. ### Question about splitting data

I am wondering what the most common way to handle data is wherein a participant belongs to multiple groups. For example, if you're wanting to run linear regression and look at how specific diet-type (IV) effects a specific health outcome (DV/response variable) and you have participants that are...
12. ### Moderator regression: plotting graphs from multiple product terms

This is my first time posting, so apologies if I don't make sense. I've conducted a hierarchical regression analysis. I have multiple IVs whereby there is controllability of weight (IV1) and two representing 'values for thinness' (IV2 and IV3 respectively) predicting levels of prejudice (DV)...
13. ### Logistic regression, but no negative responses?

So I am trying to model who is likely, from a list of addresses, to go to a store. I have lots of criteria about the people who have visited my store, but no data about who DIDN'T visit my store. I know if I had a 1,0 variable (visited store or not) that I could do logistic regression, but I...
14. ### How can I model a "multiplier effect" in time series data?

I currently have data corresponding to how often a certain set of songs were downloaded. Each song has a release date, and then the number of downloads per day going forward to today. It would look like...
15. ### Appropriate model for (repeated) data

I have some cross-sectional data, where I'm interested in estimating a relationship between the "number of items in use" in sector i of country j and the size of that sector (represented by spending power). There are other control variable. However, I have six (6) sectors and 52 countries. This...
16. ### Problematic variables in regression model

I'm using data from from a publicly available Europe-wide survey of employees which was conducted over a series of waves from 1991-2010. The survey changed slightly each time. Unfortunately there's a question about childcare that is really important, which changed considerably (initially it...
17. ### Clarifying collinearity

I am trying to run a regression model where the Y is concentration and predictors are stove type (e.g., stove1, stove 2, stove 3) and fuel type (e.g., wood, crop waste, LPG). Stove 3 uses only the fuel type LPG, while Stove 1 and Stove 2 use wood and crop waste. When conducting the multiple...
18. ### Using a kurtosis statistic as a dependent variable

Hi everyone, I am working on a research project in public policy and I am testing kurtosis for on the year-to-year budget changes (as %) in different policy areas. In the literature we know there will more than likely be L-kurtosis so I want to take it one step further. I would like to...
19. ### Correlation between two non stationary time series

Hey everyone, I'm trying to figure out if there is significant correlation between two non stationary time series (e.g. temperature on a a given day and icecream sales). Could someone please propose a method. There are so many different methods i read about online im not sure which to go...
20. ### 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...