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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Tolerable Heteroskedasticity/ Variance Inhomogenity

Hello, a long time ago I have read somewhere, that a regression can overcome heteroskedasticity/ variance inhomogenity up to certain amount. It...

• Replies: 2
• Views: 83
Today, 02:23 PM
2. ### p value of the constant, can I ignore it?

I'm analysing the influence of various factors on hare harvests in a specific are. E.g. How do the hare harvests change when the fox harvests...

• Replies: 1
• Views: 31
Today, 10:31 AM
3. ### Discretization of a continuous variable

He guys, I'm analyzing a research regarding patients and their risk factors for developing a certain side effect. If i enter age as a continous...

• Replies: 15
• Views: 295
Yesterday, 10:34 AM
4. ### Confidence for pooled within group slope

In SPSS simple linear regression one can get the confidence limits either side of the linear regression slope simply by ticking the "prediction...

• Replies: 2
• Views: 81
Yesterday, 03:18 AM
5. ### Regression with several mediators

Hello there :) Although this is connected to SPSS; I think this is the more appropriate place. Im making a linear regression and have several...

• Replies: 0
• Views: 87
03-25-2015, 08:24 AM
6. ### Approaches for multivariate nonlinear parametric regression?

I have some data that is nonlinear, but is curvilinear. It is two factors and a dependent variable. Each factor has a pretty good fit when applying a...

• Replies: 1
• Views: 111
03-24-2015, 06:45 PM
7. ### Logistic regression using dummies with dependent "holes"

Hi, I'm trying to do do a logistic regression using R. I want to regress using binary dependent variable Y as granted or not grated (1 or 0)...

• Replies: 0
• Views: 79
03-24-2015, 06:15 PM
8. ### Controlling mediation effect in a binary logistic regression

Hi everbody, It's my first post and I hope I posted in the right forum. In my master thesis I use binary logistic regression: a dichotomous...

• Replies: 2
• Views: 111
03-24-2015, 03:14 PM
9. ### Generalized Linear Mixed Models without mixed effects. A meaningless question?

Hi there, I know what fixed and random effects in linear models or GLM are. I am using Generalized Linear Mixed Models (GLMM) to handle this. So...

• Replies: 3
• Views: 130
03-23-2015, 09:02 PM
10. ### relation within Gauss-Newton method for minimization

If we study model fit on a nonlinear regression model Y_i=f(z_i,\theta)+\epsilon_i, i=1,...,n, and in the Gauss-Newton method, the update on...

• Replies: 0
• Views: 71
03-23-2015, 12:02 PM
11. ### Panel Data Model. Problem !

Hi everyone, First, Ihave to mention that I am newbie in statistic so I may have some evident questions ! Actually, I am working on a...

• Replies: 2
• Views: 83
03-23-2015, 11:51 AM
12. ### Multiple regression: one of my significant factors has outliers, what should I do?

So I ran a multiple regression and found two factors that explained one of my dependent variables quite well. The problem is that one of the two...

• Replies: 2
• Views: 207
03-22-2015, 07:29 AM
13. ### [Log.reg.] Can I include confounder that does not have all categories of exposure?

Hello. I am working on a thesis in public health science, and am stuck until this current problem i solved. Your help will be highly appreciated! ...

• Replies: 0
• Views: 127
03-21-2015, 04:51 AM
14. ### Weighted Regression

I have a few questions in regards to setting up and running my weighted regression: Firstly, some background. I am comparing point of subjective...

• Replies: 1
• Views: 264
03-17-2015, 10:36 PM
15. ### Hierarchical regression in SPSS (how to enter interactions when you have a quadratic)

Hello there! I want to confirm if I am entering my variables in the proper way in SPSS for multiple regression. I have four variables: 1) student...

• Replies: 3
• Views: 152
03-17-2015, 03:32 PM
16. ### How do I select a method of regression analysis - Allometry - Animal Growth - Gnu

I am analysing the growth of the wildebeest or gnu. To do this I am comparing the changes in A: Body length (L), B: Girth (G) and C: Shoulder height...

• Replies: 2
• Views: 185
Gnu
03-17-2015, 01:04 AM
17. ### Standard or Hierarchical Regression?

I would like to predict creativity (DV) through involvement (IV), after controlling for team size and gender. Questions 1) Do I use hierarchical...

• Replies: 6
• Views: 194
03-16-2015, 05:16 PM
18. ### Centering Variables in Interaction with Lagged Dependent Variable

I have to run this regression: Y (t) = a + b1 X (t-1) + b2 Y (t-1) + b3 X (t-1)*Y (t-1) Y at time "t" is regressed using as IVs X at time t-1,...

• Replies: 1
• Views: 100
03-16-2015, 05:04 PM
19. ### pooled OLS regression - industry dummy coefficients higher than the rest

Please delete this thread. I did not find the button to delete it. Thanks a lot Best Mat

• Replies: 0
• Views: 109
03-15-2015, 03:15 AM
20. ### Difference between two regression coefficients

Hi All: This is the context. I have three x variables with following relationship: x1 + x2 = x3. Now, I run these two equations: y = a1 + b1x1...

• Replies: 1
• Views: 219
03-13-2015, 08:18 AM
21. ### Correct statistical test to use for my data (correlation/regression)

Hello everyone, Potentially a silly question (but I am new to all of this): I have collected data from a focal animal study on Naked mole-rats....

• Replies: 0
• Views: 133
03-13-2015, 06:13 AM
22. ### Interpreting coefficients from GLM output

Hi, I'm trying to educate myself further on using GLM and to do so I figured it'd be easiest to conduct a simple experiment where I knew the...

• Replies: 9
• Views: 335
03-12-2015, 12:54 AM
23. ### Multi-Level Model

Why in multi-level models can you get away with fewer observations per predictors? I know that I have heard and seen this before, but I am not...

• Replies: 9
• Views: 493
03-11-2015, 11:56 AM
24. ### Variance of parts equal to variance of whole?

Good morning, I ran a hierarchical regression to test if variables A and B (established in the literature) are mediated by variable C (my research...

• Replies: 0
• Views: 249
03-09-2015, 06:37 PM
25. ### Multiple logistic regression - need for interaction checking?

Hello, and thank you for reading this post. I am a medical doctor with limited statistical knowledge, so bare with me... I am trying to answer...

• Replies: 3
• Views: 213
03-07-2015, 07:07 AM
26. ### unit price of total pris?

Hi, I am a first year economic student and are having some fun with regressions. I am doing a a regression analyse of some example data I have...

• Replies: 0
• Views: 138
03-05-2015, 04:05 AM
27. ### Which multilevel approach is the right one? Help needed choosing a method.

Hi everyone, I have a data set with a very specific structure and I am looking for a suitable way to analyze it. To be more precise, I am...

• Replies: 0
• Views: 148
03-04-2015, 05:47 PM
28. ### Help with interaction terms

Hi, I have two categorical variables (race and field of study) as a part of my model to predict degree completion. In addition to the original model,...

• Replies: 1
• Views: 140
03-04-2015, 02:58 PM
29. ### Help with interactions in regression

Hi I would really appreciate if anyone could please help me with this. I am doing a regression analysis, looking at the effect of 2 drugs (A or B)...

• Replies: 3
• Views: 179
03-04-2015, 07:19 AM
30. ### Binary Logistic Regression- SPSS Output

Dear TalkStats Forum, I am currently looking into a data-set which measures previous cyber-crime victimization as well as whether the participants...

• Replies: 1
• Views: 18
03-03-2015, 02:58 PM
31. ### Interpreting Coefficients in Mediation Analysis with Logged Variables

Hello out there. I really hope u can help me because i've tried to find a solution to my problem for ages now.. im performing a mediation analysis...

• Replies: 0
• Views: 156
03-03-2015, 04:22 AM
32. ### transform probit into logit

Hi everyone, is there a way to transform results obtained from a probit regression into results obtained from a logit regression? I am looking for...

• Replies: 1
• Views: 166
03-02-2015, 03:21 AM

Hi,please help me. I'm working on a thesis to determine the effect of independent variables(four independent variables, denoted by X1,X2,X3 and X4)...

• Replies: 0
• Views: 166
03-01-2015, 08:26 PM
34. ### statistical tool/program for obtaining stiffness properties by force-deflection data

I am performing flexural testing of composite honeycomb sandwich panels as per D7250,desired deliverables(stiffness values G,U and D) are obtained...

• Replies: 0
• Views: 203
03-01-2015, 10:42 AM
35. ### Dependent variable is function of itself

I have a model: qty=a.price+....(other IVs) Price is calculated as sales_amount/qty. Hence for a customer, if we aggregate data of a certain...

• Replies: 2
• Views: 264
02-27-2015, 07:55 PM
36. ### R-Squared Change - Multivariate Multiple Regression

Hello everyone, I've been asked to conduct a multivariate multiple regression with multiple DVs (3 measures of a dependence construct) predicted...

• Replies: 0
• Views: 159
02-25-2015, 06:34 PM
37. ### Non-linearity in OLS-Models, Multinominal Logit-Regression

Hey there, I have a question connected to the Ols-Model in case of nonlinearity between parameters. What should be done if the assummption of...

• Replies: 2
• Views: 211
02-25-2015, 11:49 AM
38. ### Hot to analyze data at various levels (company and employee)?

I have a data set with data at two different levels. I want to analyze the perceptions of employees of a specific management practice. The data...

• Replies: 1
• Views: 264
02-25-2015, 11:45 AM
39. ### meta analysis of many regression studies

Ive searched the forum for answers to this but no joy yet so please help if you can. I have about 30 published studies looking at the dependence...

• Replies: 12
• Views: 430
02-25-2015, 04:31 AM
40. ### Discrepancy between Geogrebra, Excel, Desmos, and TI-83 PLUS...what's the deal?

As my title implies, there is a discrepancy between Geogebra, Excel, Desmos, and TI-83 Plus. Let me explain myself I have created a fifth and...

• Replies: 3
• Views: 266
02-21-2015, 07:09 PM
41. ### Checking homoscedasticity in repeated measures

Hello, When checking the assumption of constant variance for repeated measures data, am I correct in thinking that the variance of residuals...

• Replies: 0
• Views: 157
02-18-2015, 10:36 AM
42. ### Conditional logistic regression- effect of modifiers

Hi everybody, I am new here in this forum. I am studying the effect of air pollution (PM) on health outcomes, and the characteristics that might...

• Replies: 0
• Views: 148
02-18-2015, 02:18 AM
43. ### Multiple regression where only part of the sample completed the follow up survey

Hi, For my dissertation I trying to determine whether several emotions predict behavioural intention and behaviour. Participants were asked to...

• Replies: 0
• Views: 151
02-16-2015, 02:33 PM
44. ### Interaction between binary and continuous variable in OLS

I am trying to examine the association between maternal education and child school test scores using the following equation. TestScore = β0 + β1...

• Replies: 3
• Views: 318
02-16-2015, 07:09 AM
45. ### Regression / modelling help

Hi All, I'm new here so If I've posted this in the wrong place or its not practical then I apologise. I'm new to regression so helpfully Im...

• Replies: 5
• Views: 487
02-15-2015, 07:45 PM
46. ### 2sls regression

hi, what be the consequenses of using the same explanatory variables in a simultaneous equations system? for example if both the supply and the...

• Replies: 0
• Views: 165
02-15-2015, 10:51 AM
47. ### regression analysis reporting: chemist needs help!

Hello, everyone. We have some regression data we'd like to report, but aren't sure how to best do so. Here's the situation: A lab analyst runs a...

• Replies: 0
• Views: 142
02-15-2015, 09:28 AM
48. ### how to draw a logistic curve in word, excel etc

Hello, I am working on a binary logistic regression and would like to insert the logistic sigmoid curve. do you know how to draw such a curve in...

• Replies: 0
• Views: 162
02-14-2015, 07:32 PM
49. ### Design question: proportion explained variance by placebo effect

Dear all, I have a design question about investigating a placebo effect. Does anyone have a clue how to analyze the proportion explained variance...

• Replies: 2
• Views: 169
02-13-2015, 03:23 AM
50. ### Error Propagation in Separate Binomial Logistic Regressions

On http://en.wikipedia.org/wiki/Multinomial_logistic_regression#Introduction is written, that the estimation errors of separate binomial logit models...

• Replies: 0
• Views: 133
02-12-2015, 02:08 PM
51. ### correct regression model for dependent variable

Hi all, I am new to this forum and I hope that the qestions that are bothering me can be answered together with your help. I have data (N=220)...

• Replies: 11
• Views: 526
02-12-2015, 07:47 AM
52. ### risk of using group level variables to predict individual outcomes in regression

Hi, GOAL: I have been running a multivariate linear regression to predict student outcomes (grades; at the individual student level) from several...

• Replies: 0
• Views: 180
02-10-2015, 07:09 PM

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