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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Binary Logistic Regression with categorical predictors and interactions.

I'm new to logistic regression and the project I'm working on requires a model that involves two predictors: Experimental condition (categorical...

• Replies: 2
• Views: 2,318
04-26-2013, 10:38 AM
2. ### Longitudinal analyses

I'm currently analysing data in 15 and 17 years olds. I would like to track how certain variables change between the two time points. I've found that...

• Replies: 0
• Views: 2,847
04-26-2013, 04:10 AM
3. ### mediation/moderation analysis in a within-subject design (repeated measure design)

Hi, I hope you can help me with this issue: I have a within-subject design where some stimuli (positive negative or neutral) interference with...

• Replies: 1
• Views: 3,068
04-25-2013, 12:29 PM
4. ### Suppression or Incidental Cancellation

Hello, I am analyzing data using path analysis, but I think the answer will be the same as if I was using regression so I am posting here for help. ...

• Replies: 0
• Views: 1,585
04-25-2013, 10:15 AM
5. ### Independent variables: 1 to 5 star rating

Hello, I'm having a little difficulty specifying two independent variables; Customer Score and Expert Score. The reviews are each assigned 1 to...

• Replies: 5
• Views: 2,645
04-25-2013, 12:11 AM
6. ### Basic Regression Question (Total Sum of Squares)

What is the total sum of squares (regression) when Y is constant? Is it zero, thus explained fully by your model because it is a straight line? But...

• Replies: 0
• Views: 1,141
04-24-2013, 10:46 PM
7. ### Difference in ROC curve - statistical test?

Is there a test to determine if C (the area under a ROC curve) is significantly different than another C? Or does this question even make theoretical...

• Replies: 3
• Views: 3,850
04-24-2013, 06:10 PM
8. ### Logistic Regression Skewed Data with Lots of zeros!

Hello, I am working on a Logistic Regression where the results that I am getting are not satisfactory. The hosmer and lemeshow test is being...

• Replies: 9
• Views: 9,555
04-24-2013, 05:58 PM
9. ### Logistic regression and correlation

Hi I'm building an account management scorecard with logistic regression. Some of the variables have quite large correlations, but they get selected...

• Replies: 5
• Views: 10,987
04-24-2013, 05:00 PM
10. ### Logistic regression detection of multicollinearity- is VIF applicable?

I have a model with a dichotomous DV and IVs both continuous/numerical and dichotomous. I checked for collinearity with Pearson. How do I check...

• Replies: 1
• Views: 9,150
04-24-2013, 04:36 PM
11. ### Number of variables that can be included in an exact logistic regression

I'm currently analyzing a dichotomous outcome using a small dataset of only 100 individuals. the outcome occurs in only 25 individuals and I have...

• Replies: 1
• Views: 2,772
04-24-2013, 04:13 PM
12. ### Logistic regression - time series

I'm doing a logistic regression on a timeseries. My dependent variable is I(t) and my independent variable is lags of I(t): I(t) = a + b*I(t-1) +...

• Replies: 0
• Views: 2,668
04-24-2013, 10:38 AM
13. ### Probit/Logit independent variables

Hello, My DV is a binary variable (Yes/No) and I am using a logit/probit regression analysis. As for my independent variables,there are three...

• Replies: 4
• Views: 1,593
04-23-2013, 11:29 PM
14. ### Chi-Square Analysis Question

Greetings, I was wondering if somebody would like to illuminate an issue, in laymen's terms, for me. I'm not engaged in statistics at present,...

• Replies: 2
• Views: 1,679
04-23-2013, 11:01 PM
15. ### Regression with some associated ordinal dependent variables

I have some associated categorical dependent variables that are ordinal in nature (with 4 or 5 categories). If I want to see the effect of a set of...

• Replies: 0
• Views: 1,063
04-23-2013, 02:08 PM
16. ### Should I include this variable or not?

Hello, My dependent binary variable is Turnout in 2010 elections (yes/no) and I'm performing logit analysis using a cross-sectional dataset. ...

• Replies: 11
• Views: 2,019
04-23-2013, 02:01 PM
17. ### interaction in non-linear m. - interpretation not directly drawn from coefficients?

Hi all, I read a paper (http://www.sciencedirect.com/science/article/pii/S0165176503000326) about interpretation of interaction terms in...

• Replies: 0
• Views: 778
04-23-2013, 06:41 AM
18. ### Include trend in a Poisson regression

Hey, I'm doing a research about the impact of a co-payment rise policy in the ER. My outcome variable is the number of visits in a week and my...

• Replies: 0
• Views: 1,535
04-23-2013, 06:31 AM
19. ### Cluster-robust standard errors needed in random effects model?

Hello, I'm currently working with a company dataset in the form of an unbalanced panel (overall sample size: 1.300 company years, T: 10, X: ~170...

• Replies: 0
• Views: 3,976
04-23-2013, 04:43 AM
20. ### Lagged independent variable (Stata)

Hello, I'm currently working with a company dataset in the form of an unbalanced panel (overall sample size: 1.300 company years, T: 10, X: ~170...

• Replies: 0
• Views: 4,499
04-23-2013, 03:55 AM
21. ### Non-parametric causality test

how can i rank-transform 3 variables in eviews or stata to perform non-parametric causality test? please help

• Replies: 0
• Views: 1,545
04-22-2013, 03:15 PM
22. ### Multiple rank f test

Am working with 3 variables to establish causality using multiple rank f test. How do I rank transform the variables in Eviews or Stata? Please help...

• Replies: 0
• Views: 1,224
04-22-2013, 02:47 PM
23. ### Which subset of characters follow fairly linear relationship ?

ALPHA and BETA are two physical quantities: A is dependent variable (Y-Axis) and B is independent variable (X-Axis). Values of ALPHA range from...

• Replies: 1
• Views: 1,077
04-22-2013, 12:15 PM
24. ### Including a constant term in Logit regression

In my logit regression all of my coefficients are significant under the 10% s.l. However, the constant term has a p-value of about 0.600. The...

• Replies: 1
• Views: 1,364
04-21-2013, 07:47 PM
25. ### using Andrew Hayes PROCESS

Can anyone give my instructions how to use syntax with PROCESS. I want to include more than one predictor in a mediational analysis and understand...

• Replies: 0
• Views: 3,047
04-21-2013, 07:25 AM
26. ### Coefficient of variation as dependent variable in linear regression - is it correct ?

Hi, I try to predict intra-individual variation in judgment task (20 judgment). I've done a multiple linear regression with a coefficient of...

• Replies: 0
• Views: 1,504
04-20-2013, 04:42 AM
27. ### Help - Autocorrelated and r squared crashes with GLS

I'm trying to understand the theory behind something. I've got a time series multiple regression that gets about a .83 coefficient of determination....

• Replies: 0
• Views: 2,459
04-19-2013, 09:19 PM
28. ### Testing the assumption of linearity in a multi-level logistic regression analysis

Hello all! I am working on a multi-level logistic regression (Binary Outcome) model and am trying to finding the best way to check the assumption of...

• Replies: 0
• Views: 2,410
04-19-2013, 09:00 PM
29. ### regression, interactions and centering how does it work?

Hello everyone! So yesterday our prof explained to us that one of the reasons of why you "center" (meaning you substract the mean) from your...

• Replies: 11
• Views: 3,369
04-19-2013, 07:46 PM
30. ### Probit Analysis

Greetings, My dependent variable is a binary variable (Yes/No). I chose to do a *Probit* analysis, in STATA. Thus, I started by picking some...

• Replies: 1
• Views: 967
04-19-2013, 07:29 PM
31. ### Contribution of known values to a regression model

Hello, Can anyone please tell me how I work out the contribution of known values make to a regression model using spss. For example I have a...

• Replies: 1
• Views: 2,421
04-19-2013, 02:42 PM
32. ### how to check for stationarity for a time series?

Dear All I am using a time series of 18 yearly observations using Stata 11 and how to put it in the first difference if its not stationary Any...

• Replies: 3
• Views: 2,882
04-19-2013, 11:01 AM
33. ### Correct interpretation of Lmer output

I have produced the following model ...

• Replies: 0
• Views: 3,968
04-19-2013, 10:05 AM
34. ### Correct structuring of random effects?

Hi I have produced a mixed effects model as follows; lmer(TotalPayoff~Type+Game+PgvnD*Asym+(1|Subject)+(1|Pairing),REML=FALSE,data=table1)- ...

• Replies: 0
• Views: 1,248
04-19-2013, 09:27 AM
35. ### Standard Deviation of Random effect is 0?

have a model with two random effects lmer(TotalPayoff~Type+Game+PgvnD*Asym+(1|Subject)+(1|Pairing),REML=FALSE,data=table)->m1 each pairing...

• Replies: 0
• Views: 2,389
04-18-2013, 03:55 PM
36. ### Logistic Regression: Odds Ratio Estimate=1

Hi, I am working with a logistic regression which I got as result the odds ratio estimate equals 1 for some predictive variables. As odds ratio=1,...

• Replies: 5
• Views: 1,586
04-18-2013, 12:03 PM
37. ### Logit regression - before vs after intervention

Hi. Can anyone please tell me if I can use "year" as the DV when comparing two periods (2011 before intervention; 2012 after intervention), using as...

• Replies: 2
• Views: 1,329
04-17-2013, 10:16 AM
38. ### Quantile regression: how to determine to which quantile an individual belongs

Dear Forum I am running a quantile regression (for the 0.1, 0.5 and 0.9 quantile) on a cross-section data set containing individuals from the...

• Replies: 0
• Views: 1,940
04-17-2013, 04:40 AM
39. ### Pros & Cons of a pooled model versus a non pooled one

Dear All, so this is what I mean, so I am looking at determinants of learning achievements of children. Cool. So now I would like to understand...

• Replies: 8
• Views: 3,196
04-16-2013, 11:45 AM
40. ### Find the regression line?

Using test runs with the same automobile on a test track the following data on speed (km/hr) and mileage (km/l) were obtained. Speed (x): 48 48 64...

• Replies: 2
• Views: 2,538
04-14-2013, 10:19 PM
41. ### Dealing with endogenous independent variables (Car Industry Project)

I am running a regression on vehicle demand (vehicle registrations in 2011) with the following independent variables: Assembly location Price...

• Replies: 0
• Views: 1,187
04-12-2013, 01:27 PM
42. ### Categorical variable as dependent variable

I have a categorical variable which is like: "How much do you like the sun?" 1 not at all 2 not a great deal 3 neither/nor 4 quite a lot 5...

• Replies: 6
• Views: 1,987
04-12-2013, 11:28 AM
43. ### multiple regression where the output variable is non-normally distributed

Hi I am a trainee clinical psychologist writing up my dissertation. After running tests in PASW 18 I have found out that my output variable of...

• Replies: 2
• Views: 2,345
04-12-2013, 05:11 AM
44. ### Death to Stepwise

A chapter title in a regression book I once read :p This article notes problems with the use of stepwise in the way it is commonly used....

• Replies: 0
• Views: 1,508
04-11-2013, 11:40 AM
45. ### Stepwise regression

Hi there, I wish someone can help. I will be grateful. I ran a stepwise linear regression in SPSS, and one of the signification predictors was...

• Replies: 6
• Views: 1,692
04-11-2013, 02:50 AM
46. ### Logistic model interpretation - insignificant main effect, significant interaction

Hi! I am running a logistic regression model where I investigate what characteristics matter when a group of people chooses representatives for...

• Replies: 5
• Views: 5,326
04-10-2013, 05:19 PM
47. ### Stepwise logistic regression with categorical variables

The way logistic regression works with categorical variables, is that every categorical variable with k levels gets expanded into k-1 binary...

• Replies: 2
• Views: 1,900
04-09-2013, 07:21 PM
48. ### Logistics Regression and Mediation

Hey, I'm soon to be using data from a large cohort. Ideally I want to look at whether depressive symptoms in childhood effects attentional...

• Replies: 5
• Views: 2,855
04-09-2013, 04:18 PM
49. ### Multiple Regression Model to Predict House Price

Hi there, I have a statistics assignment and the first question is causing me some trouble. The question is to predict the price of a 2...

• Replies: 0
• Views: 3,829
04-09-2013, 10:58 AM
50. ### Trouble understanding what these coefficients mean

Hi everyone, First, a quick disclaimer: I have only minimal background in statistics, and much less in regression analysis, so please excuse what...

• Replies: 1
• Views: 1,427
04-08-2013, 05:07 PM
51. ### [Optimization – Solver] Good model fit, but wrong standard deviation coefficients

Dear reader, I am facing an optimization problem and, at this point, I need help from someone with more knowledge than me. My goal: For a...

• Replies: 1
• Views: 22,789
04-08-2013, 04:59 PM
52. ### Hierarchical Regression Help ASAP!

Hi I have conducted a hierarchical regression analyses, with one IV in block 1 and 6 IV's in block 2. The variable in model 1 (which was...

• Replies: 1
• Views: 866
04-08-2013, 04:51 PM
53. ### How do I begin????

I just need to know how to begin this excel process; Develop an estimated regression equation that can be used to predict the fuel efficiency for...

• Replies: 1
• Views: 3,697
04-08-2013, 04:48 PM
54. ### Multiple regression with a summed, 13-item scale as the DV?

Hello, As part of my dissertation research I created a scale to measure perceived quality of care. This instrument is comprised of 13 binary items...

• Replies: 2
• Views: 1,798
04-08-2013, 04:46 PM

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