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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Logistic regression logit or cloglog?

Hi folks,:wave: currently I'm performing a logistic regression and I'm not sure which link function I should use. I have a binary response...

• Replies: 3
• Views: 18,111
12-03-2012, 01:37 PM
2. ### Use of Intercept Term in OLS Regression

When is it appropriate to exclude the intercept term from a standard OLS regression? The dependent variable is Sales (of a particular product) and...

• Replies: 11
• Views: 17,924
03-10-2014, 03:19 PM
3. ### Regression vs ANOVA

How would you determine whether to use ANOVA or multiple regression? What about the data or the situation of a research topic would be the deciding...

• Replies: 1
• Views: 17,708
11-25-2005, 08:41 PM
4. ### Constant Variable

Hi folks, I was wondering if you could help me understand a problem I have with a regression. Basically, SPSS excludes one of my variables...

• Replies: 2
• Views: 17,593
09-13-2010, 12:38 PM
5. ### Meaning of T-Ratio and parameter standard error in HLM analysis

Hello. I've recently used an Hierachical Linear Modeling (HLM aka mixed modeling) analysis method to look at some data. I'm only just beginning to...

• Replies: 2
• Views: 17,413
08-02-2008, 10:34 PM
6. ### Regression in First and Second Differences

I am running a regression in STATA to determine if temperature effects natural gas production in Russia and I am including the following variables...

• Replies: 3
• Views: 17,005
03-22-2011, 05:45 PM
7. ### Mallows Cp selection

I am using the best subsets method in Minitab to select the best parameters for a multiple regression, but I'm a bit confused on Mallows Cp. Some...

• Replies: 3
• Views: 16,679
04-01-2012, 02:13 PM
8. ### assumption of independence

Why is it important that cases are independent in regression (especially, logistic regression)? By "independent" i mean that observations under...

• Replies: 5
• Views: 16,653
06-09-2010, 02:04 PM
9. ### Linear Regression: reversing the roles of X and Y

Simple linear regression: Y = β0 + β1 *X + ε , where ε is random error Fitted (predicted) value of Y for each X is: ^ Y = b0 + b1 *X (e.g....

• Replies: 4
• Views: 16,564
05-27-2009, 10:39 AM
10. ### Logistic Regression: To dummy code or not to? Which backward elimination to use?

I have 10 binary dependent variables (disease prevalence: yes/no, 1/0). I want to do a logistical regression with each of them with the following...

• Replies: 5
• Views: 16,392
02-22-2013, 11:13 AM
11. ### Overall significance test of a multiple regression...

Hey all, I've been puzzling over this for some hours and I've tried many various methods from various text books, I think I must be missing...

• Replies: 1
• Views: 16,389
05-20-2010, 11:22 AM
12. ### stepwise regression with dummy variables

Hello there, I want to do a stepwise regression in order to find relevant predicting variables, but one of the possible predicting variables is a...

• Replies: 6
• Views: 16,308
07-12-2011, 09:00 AM
13. ### Factor analysis with non-normal distribution?

Hi all, Does anyone know an alternative to factor anlysis for non-normal distrbutions which explores factors or clusters on a set of 64...

• Replies: 3
• Views: 16,298
11-06-2008, 02:26 PM
14. ### Multiple Linear Regression: How to Calculate the Coefficient

This post has been deleted.

• Replies: 3
• Views: 16,188
02-08-2010, 12:03 PM
15. ### Problem with Data analysis on Likert Scale!

Hello John, Im a student of Business studies and am working on a research project titled as "Impact of Physical environment on Employee...

• Replies: 10
• Views: 16,156
07-09-2016, 03:44 AM
16. ### R^2 vs AIC paradox?

Hi Everyone, I have the following situation which has me a bit puzzled. I've fitted two different linear models to a data set and would like to...

• Replies: 13
• Views: 16,142
04-07-2011, 11:10 PM
17. ### Comparing regression slope intercepts in SPSS

Hello, my name is Robert Hall and I have got myself in a bit of a pickle with my 3rd year research project. For my project I am looking at the...

• Replies: 4
• Views: 16,004
Jac
07-09-2012, 11:39 AM
18. ### Univariate Logistic Regression - how to performe

Hello, I wonder how to perform Univariate Logistic Regression analysis in SPSS. Tested variables are dichotomized and predictors are ordinal and...

• Replies: 14
• Views: 15,783
12-29-2013, 02:19 PM
19. ### Interpretation of Loglinear model

Hi All, I am performing a regression analysis through a log linear model. But I am not able to effectively interpret the coefficient of the...

• Replies: 2
• Views: 15,634
04-10-2011, 01:17 AM
20. ### Coefficient of determination and statistical significance

Hi, I tried two different models for a regression (both with one predictor). The first one was a linear regression model of the type Y= a + bX...

• Replies: 6
• Views: 15,316
02-16-2011, 01:49 PM
21. ### Regression Model is not full rank

Hi all, I am trying to detect relationship of crop yield at the end of the growing seasson (1 dependent variable) using amount of precipitation in...

• Replies: 3
• Views: 15,248
02-06-2015, 03:08 AM
22. ### non-integers in poisson GLM

Great forums, thank you to everyone who contributes to them. My question is regarding non-integer values from some data I collected on parrots...

• Replies: 7
• Views: 15,143
12-30-2011, 01:11 PM
23. ### Multicollinearity and AIC in stepwise regression

I am trying to run a stepwise regression with backward elimination on a set of water chemistry data in which there's a high degree of...

• Replies: 12
• Views: 15,127
Laz
07-09-2011, 11:57 AM
24. ### [SPSS] Multivariable logistic regression - how to transform to achieve linearity?

Hi, I am doing a project to identify variables that can predict rehospitalisations. There are a few categorical and continuous variables that I...

• Replies: 15
• Views: 14,648
08-12-2013, 07:05 PM
25. ### Interpreting a moderation effect

Yesterday I submitted my firts thread but I learnt that it was too vague. I did my work but now I have some doubts interpreting a moderation effect....

• Replies: 3
• Views: 14,249
05-07-2009, 01:50 AM
26. ### Likert Scale Regression Analysis

I want to perform a regression on some likert scale data. Basically its a scale which measures propensity for participative management. The rationale...

• Replies: 7
• Views: 14,249
08-13-2013, 04:09 PM
27. ### back-transformation of logit-transformed behavioral data

Hello, I am posting with hopes that someone can assist me in making sure that I am back-transforming my data correctly. I have behavioral data...

• Replies: 12
• Views: 14,104
01-31-2012, 02:15 AM
28. ### Standard Error of Coefficients in Multiple Regression

Hi, I have built a model in Excel to do Multiple Regression. I am able to correctly calculate the intercept and the regression coefficients but I...

• Replies: 1
• Views: 14,011
10-26-2009, 02:49 PM
29. ### Possible to analyze cross lag panel data with regression alone (no SEM)?

I have 2 (soon to be 4) waves of panel data. I have a relatively small sample size so I don't think I should use SEM - also I don't really...

• Replies: 7
• Views: 13,978
03-14-2012, 10:57 AM
30. ### Calculating prediction intervals (error estimates of specific predicted points) in a

Hi all, this is my first post here so please let me know if I need to provide more details. I want to generate a multivariate logistic regression...

• Replies: 6
• Views: 13,973
06-22-2010, 01:01 AM
31. ### Multiple regression with SPSS

Hi All, I have done multiple regression in SPSS with three different methods, namely, FORWARD, BACKWARD and STEPWISE. Final outcome is...

• Replies: 2
• Views: 13,958
01-01-2011, 01:39 PM

Hello all, I am trying to run a nested ANOVA in JMP on some ecological field data - I'm trying to measure whether fish biomass is different in...

• Replies: 30
• Views: 13,813
02-15-2012, 12:22 AM
33. ### Variance inflation and interactions between variables?

Hello everyone I am having trouble interpreting some of my results. I am using logistic regression to infer a model based on measured data....

• Replies: 8
• Views: 13,738
01-05-2015, 01:34 PM
34. ### Low R-squared, but my variables fit expectations

So I ran a regression on 3 different sets of data estimation techniques versus actual survey data. The dependent variable was the non-survey...

• Replies: 1
• Views: 13,660
09-16-2010, 10:55 AM
35. ### First difference regression - how to interpret coefficients?

Hi there, I am planning to apply first difference regression in order to account for time (2 time points). I was wondering what will be the...

• Replies: 3
• Views: 13,616
08-21-2013, 03:38 PM
36. ### How to prove E(SSE)=(n-2)singma^2 ???

I'd like to know to how to prove E(SSE)=(n-2)singma^2 (SSE=Syy-BetaHat1*Sxy) . Ive been workin' on it for many days but still cant figure it out....

• Replies: 4
• Views: 13,603
01-19-2012, 10:44 AM
37. ### P-value in regression analysis

How much should a p-value in a regression model be for the related variable to be considered insignificant?

• Replies: 6
• Views: 13,590
12-25-2011, 02:33 PM
38. ### Independent variables correlate to each other: violation of regression assumoptions?

Ok, so bear with me - total statistical idiot here, in way over his head. I'm running multiple regressions of plant cover against precipitation,...

• Replies: 11
• Views: 13,580
11-19-2008, 10:17 AM
39. ### Cross validation in SPSS

Hi, I need to conduct cross validation of my data to check for predictive validity. This is what I did so far. I divided the sample into two...

• Replies: 6
• Views: 13,559
06-19-2013, 03:34 AM
40. ### Polynomial Regression interpretation

I have 2 questions that I need help interpreting: 1. Y = 47.31051 + 1.06914(X) - .01383(X^2) Because X is used twice (and one of them is a...

• Replies: 2
• Views: 13,389
01-23-2012, 12:16 PM
41. ### Multiple Regression & Multiple Linear Regression: 2 Qu's

I know these are 2 very basic question, but if someone could please confirm them for me I'd be very grateful indeed: 1. Am I correct in thinking...

• Replies: 4
• Views: 13,295
12-05-2008, 03:40 PM
42. ### Cutoff points in logistic regression

One of the articles I am reading now makes reccomendations for changing the cuttoff point used in predicting whether Y=1 or 0. My question is, since...

• Replies: 6
• Views: 13,287
03-27-2014, 08:17 AM
43. ### Find expected value and variance of ARMA(1,1) model

My apologies if this isn't the correct subforum to ask this question. Here's the model: y_{t}=50+ 0.8y_{t-1} + a_{t} - 0.2a_{t-1} How do I...

• Replies: 3
• Views: 13,186
04-27-2011, 02:11 AM
44. ### Logistic Regression: Include constant in the model or not?

Hi! 1. Could anybody give me a detailed explanation about why is inappropriate not to use a constant in a logistic regression model? Could you...

• Replies: 5
• Views: 13,097
06-12-2012, 06:08 AM
45. ### MANOVA vs ANOVA

Hi guys, I have a small question. I ran a MANOVA model, with 4 DV's and 1 IV with 2 categories. I got a non significant result, with P. Value of...

• Replies: 9
• Views: 13,062
09-07-2010, 03:56 AM
46. ### ANOVA table insignificant in Regression

Greetings!!! Regression analysis produced ANOVA table insignificant. Please confirm if I should report regression results. Thanks Rayyan

• Replies: 6
• Views: 12,916
09-23-2010, 04:43 PM
47. ### Multiple regression analysis: Significant regression model, insignificant predictors

With regards to the title above, my multiple regression model has a significant F value but none of the predictors are significant. All the...

• Replies: 6
• Views: 12,865
08-30-2011, 04:51 PM
48. ### Multiple Linear Regression for Categorical and Continuous data Independent Variable

Dear all, I need to analyze the relationship of DV and IV. I have Dependent variable in continuous data. And i have around 22 independent...

• Replies: 2
• Views: 12,659
09-22-2011, 10:17 PM
49. ### comparing regression coefficients from the same model

Hi, I think this question has been answered in bits and pieces here and there, but I am still a bit unsure about what the best approach for this is:...

• Replies: 12
• Views: 12,656
02-16-2012, 12:47 PM
50. ### Increasing variance in linear regression

Hi, I have a response and a predictor variable, weight and height, to which I've fitted a linear regression. The relationship appears to be...

• Replies: 6
• Views: 12,574
05-29-2008, 09:33 AM
51. ### Interpreting the coefficient in a NegBin regression

Hi, I am doing a regression on immigration in Denmark. My dependent variable is a count variable with the number of immigrants between two regions...

• Replies: 1
• Views: 12,491
04-24-2011, 07:33 PM
52. ### Categorical Count Data and ANOVA

Hi, I hope this is in the right section. I heard that ANOVA shouldn't be used for analysing categorical count data. If this is the case, can...

• Replies: 6
• Views: 12,469
08-17-2010, 09:54 PM

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