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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### 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: 2,521
03-17-2015, 03:32 PM
2. ### 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: 2,579
Gnu
03-17-2015, 01:04 AM
3. ### 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: 1,509
03-16-2015, 05:04 PM
4. ### 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: 1,863
03-15-2015, 03:15 AM
5. ### 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: 1,345
03-13-2015, 08:18 AM
6. ### 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: 1,217
03-13-2015, 06:13 AM
7. ### 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: 2,924
03-12-2015, 12:54 AM
8. ### 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: 3,514
03-11-2015, 11:56 AM
9. ### 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: 1,685
03-09-2015, 06:37 PM
10. ### 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: 2,598
03-07-2015, 08:07 AM
11. ### 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: 1,697
03-05-2015, 05:05 AM
12. ### 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: 1,148
03-04-2015, 06:47 PM
13. ### 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: 1,634
03-04-2015, 03:58 PM
14. ### 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: 1,659
03-04-2015, 08:19 AM
15. ### 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: 1,721
03-03-2015, 03:58 PM
16. ### 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: 1,351
03-03-2015, 05:22 AM
17. ### 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: 1,823
03-02-2015, 04:21 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: 1,728
03-01-2015, 09:26 PM
19. ### 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: 1,447
03-01-2015, 11:42 AM
20. ### 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: 1,923
02-27-2015, 08:55 PM
21. ### 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: 2,339
02-25-2015, 07:34 PM
22. ### 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: 1,801
02-25-2015, 12:49 PM
23. ### 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: 2,442
02-25-2015, 12:45 PM
24. ### 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: 9
• Views: 2,990
02-25-2015, 05:31 AM
25. ### 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: 2,504
02-21-2015, 08:09 PM
26. ### 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: 1,548
02-18-2015, 11:36 AM
27. ### 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: 1,663
02-18-2015, 03:18 AM
28. ### 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: 1,294
02-16-2015, 03:33 PM
29. ### 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: 2,395
02-16-2015, 08:09 AM
30. ### 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: 2,531
02-15-2015, 08:45 PM
31. ### 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: 1,433
02-15-2015, 11:51 AM
32. ### 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: 4,024
02-15-2015, 10:28 AM
33. ### 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: 3,348
02-14-2015, 08:32 PM
34. ### 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: 1,318
02-13-2015, 04:23 AM
35. ### 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: 886
02-12-2015, 03:08 PM
36. ### 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: 2,439
02-12-2015, 08:47 AM
37. ### 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: 1,352
02-10-2015, 08:09 PM
38. ### Linear Regression (Age Interval, 10 years)

Hi guys, I initially ran a linear regression, however we found that age (by year) generated a negligible B coefficient. In response we...

• Replies: 5
• Views: 1,585
02-10-2015, 08:54 AM
39. ### F-Test for SLR & MLR?

I am trying to finish a homework problem for a grad level stats class and can't seem to find an answer anywhere to this question written in plain...

• Replies: 1
• Views: 1,928
02-10-2015, 02:09 AM
40. ### Interpretation of linear-log regression model (Neep Help)

Dear All, I had a problem with my data of growth in percentage regarding negative and positive values due to which I could not transform it into...

• Replies: 2
• Views: 1,705
02-09-2015, 01:46 PM

Hey People Im currently learning to use multivariate analysis in my PhD project, and have an Abstract deadline and a Statistician on holiday so I...

• Replies: 0
• Views: 1,291
02-09-2015, 08:06 AM
42. ### Writing R^2 strictly in terms of simple correlations among variables

Say we have the following regression Y_i=\beta_0+\beta_1X_{1i}+\beta_2X_{2i}+\epsilon_i I want to write the multiple R^2 for this regression...

• Replies: 8
• Views: 3,268
02-07-2015, 07:06 PM
43. ### Ambulance utilisation: help choosing a method

Hi, I need some advice in selecting a statistical test please. I am researching ambulance utilisation rates at a population level (defined by a...

• Replies: 8
• Views: 2,038
02-06-2015, 04:57 AM
44. ### Must categorical variables always be dummy coded in linear regression?

My question is must we always dummy code categorical variables in linear regression. What if I wanted to understand the overall effect of a...

• Replies: 2
• Views: 2,415
02-06-2015, 04:43 AM
45. ### 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: 16,692
02-06-2015, 03:08 AM
46. ### Fixed term is “(Intercept)” --Dredge function

Hi, i'm currently running a glm model in R and have attempted to use the following code: Model:...

• Replies: 2
• Views: 6,819
02-05-2015, 11:08 PM
47. ### Which Blood Pressure Tool better predicts kidney function: help choosing test.

Hi there, I am trying to see whether there is an advantage of using one blood pressure tool over another at predicting kidney function. Both...

• Replies: 1
• Views: 1,332
02-05-2015, 10:12 PM
48. ### Strategies for managing multicollinearity in hierarchical regression

Strategies for managing multicollinearity in hierarchical regression Hi, I am doing a thesis project that involves using hierarchical multiple...

• Replies: 0
• Views: 891
02-04-2015, 07:13 PM
49. ### range of possible values for regression coefficients given another one?

i feel like the answer to my question is a 'no' but i'll ask it anyway just to be absolutely sure. say you have 3 variables X, Y and Z each one...

• Replies: 3
• Views: 1,936
02-04-2015, 04:11 PM
50. ### How to check if vector is close to space spanned by 2 basis vectors (lin. regression)

Here is the situation: I have measured gene expression data for cells that have been subjected to three different stimuli. This means I have 3 long...

• Replies: 0
• Views: 1,032
02-04-2015, 10:48 AM

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