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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. Regression analysis -- Sales & Advertising cost

Am not a statistician ?? Can someone help me understand the Linear Regression & Multivariable regression ?? By considering the Sales as an...

• Replies: 1
• Views: 1,279
08-11-2013, 11:49 AM
2. help on a simple Q.

Sorry for posting this basic Q. but I really do not seem able to wrap my mind around this "surprise" at least for me. the problem is as follows: I...

• Replies: 3
• Views: 1,201
08-11-2013, 06:39 AM
3. My Moderator is Group= can I still standardise it??

Please help!! I am trying to do moderated regression after failed attempts at MANOVAs, and am having an issue with my moderator variable... I...

• Replies: 4
• Views: 1,398
08-10-2013, 10:36 AM
4. Interpreting of hypothesis prediction after reversed relationship

Dear Community, I am currently facing a big issue with regard to my master thesis. I developed following hypotheses: Hypothesis 1: Managers’...

• Replies: 1
• Views: 921
08-10-2013, 09:54 AM
5. Hurdle models_accident data

Hi, I am currently working on my dissertation which deals with rail accidents at level crossings. I am supposed to find out if the accidents can...

• Replies: 2
• Views: 1,633
08-10-2013, 05:56 AM
6. Compare slopes of multiple regression models - repeated measures at mult conditions

In an experiment I measured how hard (torque, dependent variable) subjects could push against a plate as it rotated at 4 speeds: stopped, slow,...

• Replies: 3
• Views: 2,522
08-09-2013, 12:52 PM
7. Moderation with a Categorical Moderator

Hi guys, My proposed moderator is a categorical variable (group type) and I am unsure how to approach the analysis. I have only found examples...

• Replies: 0
• Views: 2,858
08-08-2013, 06:26 AM
8. Explain the nonsignificance of simple slope analysis (with significant interaction)?

Hi everyone, I need some help. In a study, I tested an interaction hypothesis and got a significant interaction result (p < .05) and visual...

• Replies: 4
• Views: 4,474
08-07-2013, 03:42 PM
9. Any good online lectures of time series introduction?

Hello all: I'm looking to find "good" online videos that provide an introduction to time series analysis (some of the basics, applications....). ...

• Replies: 1
• Views: 4,035
08-05-2013, 01:50 PM
10. SEM - general applicability of analysis, variable aggregation, and data sufficiency

Dear all, I just discovered this amazing forum and was wondering whether some of you may have answers for some questions I could not find any...

• Replies: 0
• Views: 1,517
Yym
08-05-2013, 01:07 PM
11. Binary Logistic SNAFU

Hello, I'm curious if I have coded my variables incorrectly for an analysis. Here's a brief explanation: Independent variables: X1:...

• Replies: 3
• Views: 1,011
08-05-2013, 10:22 AM
12. Struggling with regression analysis

Hi guys, I'm new to stats and I'm new on here! I have a homework question that I do not understand. A multiple regression, 3 explanatory...

• Replies: 1
• Views: 2,546
08-04-2013, 04:42 PM
13. Interpretation equation Wald test when using Seemingly Unrelated Regression

I am investigating the added value of commodities to a stock portfolio. Therefore, I use the Mean Variance Spanning test. Testing for spanning is...

• Replies: 0
• Views: 3,658
08-03-2013, 04:54 PM
14. Heckman 2 step procedure - how to formulate probit model for real estate?

Dear all, I'm doing research on the attributes that determine listing prices of houses. Price is updated to the current date and independent...

• Replies: 0
• Views: 2,874
08-02-2013, 05:57 PM
15. Interpreting interaction between dummy IV and continuous moderator with log DV

Hello Community, I urgently need your help to read the results of my regression analysis for my master thesis, which I need to hand in next week....

• Replies: 13
• Views: 3,283
08-02-2013, 09:18 AM
16. Regression Equation : Looking for some help

Hi buddies, I'm new here and trying to learn SPSS. To be honest, do not have good knowledge on it. looking for some help. Would really be thankful...

• Replies: 5
• Views: 2,444
08-01-2013, 06:47 PM
17. Interpreting multiple regression analysis

Hello, I hope someone knows what the answer is to my question: I have a multiple regression analysis. Dependent variable is performance (time)...

• Replies: 5
• Views: 1,729
08-01-2013, 12:39 PM
18. New To Regression Analysis, Positive Beta should be negative?

Hey everyone, new to the community and looking for some help. Would greatly appreciate any input you're able to offer! I'm currently in the...

• Replies: 5
• Views: 2,719
08-01-2013, 12:29 PM
19. Source for WLS Regression

I'm working on a paper in which I run a study using a WLS regression methodology. I understand conceptually how it works and can run it easily in R....

• Replies: 0
• Views: 974
08-01-2013, 11:10 AM
20. Comparing magnitudes of logit/ordered logit coefficient estimates

Greetings! I have a logit model with a number of independent variables which are binary and therefore measured on the same scale. I am stuck on...

• Replies: 0
• Views: 1,476
08-01-2013, 02:36 AM
21. Validating regression models

It is commonly suggested that you use part of the data to generate a model, and then use the rest of the data you withheld from creatng the model to...

• Replies: 6
• Views: 2,365
07-31-2013, 09:13 PM
22. Time Series Analysis - Stationarity After a Point

Hello, I am currently trying to model a time series to see if it becomes stationary after a certain number of time intervals (months). A simple...

• Replies: 3
• Views: 1,448
07-30-2013, 02:43 PM
23. Regression Discontinuity

Hi... I'm trying to define a model for estimating the impact of a political program (increase in user fees). I thought about using the RD since...

• Replies: 7
• Views: 2,249
07-30-2013, 11:20 AM
24. different times (different scores) but one regression

Hi, Does anyone know how to do a regression analysis that incorporates data from 2 time points (same participants)? Up until now I have been...

• Replies: 0
• Views: 1,234
07-30-2013, 06:37 AM
25. Regression Residual

Hi Guys, A question, something to do with knowledge of terminology as well in the application field. When we look at the returns of stocks and...

• Replies: 0
• Views: 1,347
07-29-2013, 03:58 PM
26. Interaction effect and model interpretation

Hello all, Hoping someone can help with a model selection question... I'm testing the degredation rates of DNA (amount of error in...

• Replies: 5
• Views: 2,613
07-29-2013, 10:08 AM
27. HMR help needed

Hello, we collected data from 50 people to investigate whether empathy is affected by age, loving poetry, speaking poetry, writing poetry, and...

• Replies: 0
• Views: 949
07-28-2013, 02:51 PM
28. Prediction interval of generalized linear models

When doing predictions using a generalized linear model, how to get the prediction interval or prediction distribution? My model has a gamma...

• Replies: 0
• Views: 1,308
07-27-2013, 12:07 PM
29. Unordered categorical variables and linear regression

Hi everyone, I am new to this forum and still sort of a novice with regards to statistics. In my M.A. thesis I use one binary dependent...

• Replies: 5
• Views: 3,729
07-26-2013, 01:04 PM
30. Wald chi-square test vs likelihood ratio chi-square test. Which to accept in Logistic

Hi, I have an interesting problem I was hoping someone could offer me some advice with. I'm currently running binary logistic regression on...

• Replies: 0
• Views: 2,835
07-25-2013, 09:34 PM
31. when to perform a multiple regression test

I have compared my treatment effect for the 4 variables to see which one was affected. Only one variable changed significantly pre vs. post. Can...

• Replies: 10
• Views: 2,414
07-25-2013, 05:09 PM
32. question about panel data and interaction terms

Hi everyone, I'll try to keep this simple I am using 4 waves of panel data from a national longitudinal survey I'm trying to predict my...

• Replies: 1
• Views: 3,092
07-25-2013, 04:58 PM
33. Which one to use? Multiple Regression or Structured Equation Modeling

I am in the process of writing my dissertation. I have a question about statistical method. My study is to analyze the factors that affect...

• Replies: 2
• Views: 1,208
07-25-2013, 09:14 AM
34. Interaction term in multiple regression with categorical variables

Hello everybody, I have question concerning categorical variables and multiple regression: My Scenario: I have two independent categorical...

• Replies: 0
• Views: 1,508
07-25-2013, 03:26 AM
35. Unequal sample size among sub-groups: Effects on significance levels?

Hello, I just came across a finding which I find somewhat strange: I conducted a quite simple multiple regression analysis in a dataset that...

• Replies: 6
• Views: 5,385
07-25-2013, 02:37 AM
36. Does vce(robust) correct not normally distributed errors (dependent variable)?

Hello everyone, I have a question regarding the vce(robust) command in Stata. I have used this command for dealing with heteroskedasticity. I have...

• Replies: 0
• Views: 1,318
07-24-2013, 06:10 AM
37. Multivariate regression

Hello, I am using SPSS 20.0 and am running a multivariate regression using the GLM...

• Replies: 6
• Views: 2,125
07-24-2013, 12:31 AM
38. Probit Analysis Help

Can someone help on Probit analysis in the toxicity of Copper sulfate pentahydrate on brine shrimp? I am just a Hisg school student and I really...

• Replies: 3
• Views: 1,791
07-23-2013, 11:59 AM
39. Is my dependent variable both continuous and binomial?

Hi all, I think my dependent variable is both continuous and binomial. To explain: My dependent variable is the time it takes for an individual...

• Replies: 2
• Views: 1,176
07-23-2013, 09:18 AM
40. unusual experimental design

Hi I recently did an experiment with two factors. The first factor is picture (nice vs ugly), the second factor is presentation type (picture vs...

• Replies: 2
• Views: 1,120
07-23-2013, 06:36 AM
41. Estimating the demand function for a product

Hi everyone! I have around 20 products with 30 monthly observations for each that I need to analyze. I have data on demand, normal price,...

• Replies: 1
• Views: 1,435
07-23-2013, 05:40 AM
42. Small-sample bias adjustment AIC in SPSS for Multinominal Logistic Regression

Hi everyone, New to the forum. My SPSS output for my nominal regression run does not include AICc in the Model Fiting Information table. It...

• Replies: 2
• Views: 2,509
07-22-2013, 07:48 PM
43. Appropriate Statistical Test

just wondering what kind of test of statistical test i could do to test this: The data i have are all continuous variables (Coral Size (cm^2), Fish...

• Replies: 3
• Views: 2,407
07-22-2013, 01:23 PM
44. Multiple questions about regression (in Stata)

- What does it mean if my coefficient is negative while my constant is positive? - How do I add control variables in Stata? I have tried making a...

• Replies: 0
• Views: 1,516
07-21-2013, 06:35 AM
45. log log regression

When specifiying a model, is there a downside to logging the left hand variable, and logging only one right hand side variable assuming x1 is the...

• Replies: 1
• Views: 1,463
07-20-2013, 08:18 PM
46. Understanding coefficient of determination

Hello everybody Im having some trouble understanding R^2. Almost everywhere, people describe it as the amount of the total variance in y that can...

• Replies: 6
• Views: 2,775
07-20-2013, 07:12 AM
47. Help with odd MLR suppression example!

I have quite a strange situation at hand that I am struggling to interpret: Fairly simple model in question, two continuous IVs, one continuous...

• Replies: 3
• Views: 1,314
07-19-2013, 12:29 PM
48. How to choose data for your regression

Hi guys, I'm developing a statistical method to analyse a player's performance in tennis (annotation). To do this I need to decide on certain...

• Replies: 16
• Views: 4,431
07-19-2013, 12:16 PM
49. Hglm

Hi, I am trying to run an HGLM analysis with a 5-point Likert-type scale data set for the purposes of differential item functioning detection. ...

• Replies: 2
• Views: 1,900
07-18-2013, 11:48 PM
50. t statistic or p value

When reporting results of a regression for a paper, should the t statistics or p value be in parenthesis below the coefficients. I've seen some...

• Replies: 3
• Views: 2,373
07-18-2013, 08:10 PM
51. question about path analysis

Hi I want to run a path analysis (not SEM ) I want to see whether two variables (A & B) predict another one (C). I also want to check whether C...

• Replies: 2
• Views: 1,279
07-18-2013, 03:53 PM
52. Standardized regression coefficients - why?

Hello everybody :wave: When doing a multiple linear regression analysis, you would often like to know which predictor variable has the most...

• Replies: 5
• Views: 2,113
07-18-2013, 08:57 AM

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