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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Prediction Region/Set from Multiple Logistic Regression

Hello all, I'm not sure how easy or difficult the following question actually is but for all my efforts I haven't been able to find the answer, if...

• Replies: 9
• Views: 4,877
06-11-2011, 12:54 AM
2. ### Time Series Analysis with lags and non temporally consecutive values

This is what i'm trying to do. Ive got a set of news surprise data (announced value-forecast) at the times of release. For example, I have 12 GDP...

• Replies: 0
• Views: 2,709
09-12-2010, 07:38 PM
3. ### "No Observations"

Hi, I was hoping someone might be able to help solve this problem. The values are all formatted as numeric. I'm regressing news announcements on...

• Replies: 1
• Views: 2,473
09-13-2010, 07:57 AM
4. ### Repeated measures - appropriate for my study or not?

Howdy folks - first time poster here. I'm a grad student at CU-Boulder working on grassland ecology and need some assistance. I've got six...

• Replies: 1
• Views: 2,784
10-10-2008, 01:23 AM
5. ### 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: 13,576
11-19-2008, 10:17 AM
6. ### Math Help: How to Calculate Weights for Multiplicative Model with Dummy Variables

Hi Everyone, My question is how do I calculate weights for Y=W1X1*W2X2*WNXN where N is the number of independent variables. I could use...

• Replies: 1
• Views: 2,421
01-18-2017, 04:51 PM
7. ### Predictions after mean-centred regression

Hi, I wonder if anyone can help me with a problem I'm having. I just performed an ordinary (LS) regression in which both the dependent and...

• Replies: 1
• Views: 1,033
07-02-2014, 01:18 PM
8. ### Single parent-offspring regression

Does anyone know how to do this? I can't find the web page I found with the full explanation:shakehead Failing that, I am carrying out a study...

• Replies: 0
• Views: 2,995
03-08-2012, 03:03 AM
9. ### Testing heteroscedasticity statistically

Hi everyone, I conducted a Breush-Pagantest and it is unsignificant, so there is no heteroscedasticity. My residual plot however looks pretty...

• Replies: 2
• Views: 2,026
07-06-2015, 04:05 AM

Hi everyone, Currently I'm writing my thesis on the effects of divorce on children. It's a complex design so I guess I'll be posting more...

• Replies: 2
• Views: 1,312
06-25-2015, 07:50 AM
11. ### Conducting a White's test in SPSS

PLEASE anyone?? I'm really struggling here... Hi everyone, I've seen a tutorial on youtube on how to conduct a white's test in spss. I was...

• Replies: 1
• Views: 6,036
07-10-2015, 05:44 AM
12. ### Weighted Cases- Binomial Logistic Regression in SPSS

I am currently using the HCUP KID federal database which employs discharge weights to better estimate the true number of cases. For example, I have...

• Replies: 0
• Views: 2,573
07-21-2016, 02:34 PM

You have the ramp-servicing contract for a midsize car wash. For wash workers you use predominantly part time workers, all of whom have sufficient...

• Replies: 4
• Views: 4,495
09-09-2010, 03:49 PM
14. ### Linear regression, predictor contains same components as depedent variable

I came across this model: y(t) = f (y(t-1), X) where y ia a centered 3-month average, for example, for aug'12, y=average of Jul, Aug and Sep...

• Replies: 1
• Views: 1,001
10-22-2012, 08:01 AM
15. ### Skewed dependent variable in logistic regression-how to handle

I am conducting research on juvenile firesetting with a child's self report of firesetting as my dependent variable.(0= never played with or set...

• Replies: 4
• Views: 6,605
11-08-2012, 07:18 PM
16. ### 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: 1,323
07-24-2013, 06:10 AM
17. ### Assessing the relationship between a continuous variable and categorical variables

Hello! I have a problem for which I have trouble finding a solution. I would like to assess the relationship between a continuous dependent...

• Replies: 2
• Views: 2,919
09-09-2013, 12:20 PM
18. ### Help! WLS + Bootstrap

Hello everyone, I would like to do a weighted-least-squares regression through a nonparametric bootstrap in stata. Does anybody know how this...

• Replies: 3
• Views: 2,160
01-17-2014, 04:44 AM
19. ### Regression more than two Y variables

Hi, sorry this is probably a very stupid question! I'm just trying to finish m thesis proposal and have just realised that my statistics are wrong. I...

• Replies: 5
• Views: 3,515
02-04-2013, 02:12 PM
20. ### Need advice on methods to assess nested random effects ecology data

Hi everyone, I am a PhD student working in forestry/ecology. More specifically, I am looking at the effects of harvesting on soil nutrient pools....

• Replies: 1
• Views: 2,220
03-01-2013, 12:17 PM
21. ### Nested or Repeated measures analysis for ecology data?

This is a refinement of an earlier question I asked. ...

• Replies: 3
• Views: 4,225
03-18-2013, 11:03 AM
22. ### Regression sample size

Members, Please let me know if i can do a regression analysis for a sample size 40 with 8 predictor variables?

• Replies: 5
• Views: 3,302
01-24-2013, 05:24 AM
23. ### Multiple Linear Regression with categorical interaction?

HI All, I'm not sure if what I am doing is correct. I have a continuous exposure variable, a continuous outcome variable and another variable...

• Replies: 2
• Views: 2,058
10-22-2013, 08:51 AM
24. ### How to interpret Multiple Linear Regression Output from SPSS

Hi All, I have completed a multiple linear regression in SPSS and I need a bit of help interpreting the results. dependent variable-score of...

• Replies: 0
• Views: 2,051
10-23-2013, 01:43 AM
25. ### Multiple Linear Regression and likelihood Ratio Test

Hi All, I have completed multiple regressions with one model including an interaction term, and the other not including the interaction term. ...

• Replies: 4
• Views: 5,586
11-06-2013, 09:22 PM
26. ### Automated multivariate nonlinear regression

I have 4,300 lines of data that looks like this in each column: IV1, IV2, IV3, DV1, DV2 It has five columns, three are IVs, two are DVs. How can I...

• Replies: 1
• Views: 2,897
02-26-2011, 04:36 PM
27. ### Testing heteroskedasticity of error variance

Hello, I'm trying to test the heteroskedasticity of the error variance by using BP test and Non-constant variance score test. However, I get very...

• Replies: 0
• Views: 2,679
02-16-2013, 01:18 AM
28. ### Price endogeneity

Hi experts, I am trying to make a demand model for hotel rooms using OLS regression. I got booking data for my hotel for 4 years and have the...

• Replies: 2
• Views: 1,456
12-09-2013, 01:08 PM
29. ### Which kind of Regression should i use for this case?

Hello everyone, I'm new here and i have just begann with statistical research. I'd be very thankful if anyone could help me with my situation. I...

• Replies: 12
• Views: 2,224
07-07-2013, 04:35 PM
30. ### adjusting a proportion score (controling for age)

I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

• Replies: 8
• Views: 4,354
12-15-2008, 11:23 PM
31. ### Not Significant Coefficients

I've run a logit regression to estimate the probability of attending high school. I've done this for many years. The thing is that some coefficients...

• Replies: 9
• Views: 2,575
06-05-2013, 11:29 AM
32. ### Not sure what kind of regression to run here, plus extra ?'s

Hey there. Frustrated grad student who's never been good at math here. :P Suffering through a final project, could use some input. We're using...

• Replies: 0
• Views: 1,390
12-17-2011, 08:43 AM
33. ### How exactly does MLR hold other things constant?

Hi all, I have just signed up to the forum and I am quite inspired by the discussions. I have an intermediate level experience in statistics...

• Replies: 2
• Views: 2,997
09-17-2013, 09:46 AM
34. ### Probit Regresion

Hi all. What does categ.(factors) and count data mean in probit regression? Categ.(factors) mean covariate or something like that?

• Replies: 2
• Views: 1,498
04-30-2015, 07:51 AM
35. ### Probit Regression

Hİ all. Hope everyone is great. I just want to ask a question. What are the assumptions of probit regression? Can you offer me a book about probit...

• Replies: 1
• Views: 1,264
08-04-2015, 03:39 AM
36. ### Chi-square instead of Multiple Regression Analysis

Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

• Replies: 0
• Views: 1,120
05-21-2016, 11:42 AM
37. ### Two way repeated measures with zeros, non integer values, and non-normal distribution

I would really appreciate some help with a few models I am trying to run. Essentially my data looks at how often a subject was visited depending on...

• Replies: 1
• Views: 1,446
05-12-2016, 01:48 PM
38. ### Poisson regression problem

I was doing a Poisson regression for my data. I got a bunch of 0 or 1 (response variable) data and I used GLM in R to fit the model. Then I found...

• Replies: 0
• Views: 1,959
07-08-2011, 10:08 PM
39. ### Multiple chi-square or logistic regression?

Hi, I'm new to statistics and am working on a project for work. I have read extensively and believe I am on the correct path, but would like to...

• Replies: 1
• Views: 6,641
06-22-2009, 07:36 PM
40. ### 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: 1,211
02-16-2015, 03:33 PM
41. ### Effect Coding: p-value of reference category

Hi, I fit a regression model with effect coded variables. I'm well aware of how to compute the value for the reference category but I have...

• Replies: 2
• Views: 4,229
02-19-2013, 03:38 AM
42. ### Logit:why aren't my exponentiated coefficients equaling my odds ratio (for nominal x)

I'm running logit in JMP. My understanding is that if you exponentiate the coefficients, you get the change in odds ratios from a 1 unit change in X....

• Replies: 3
• Views: 2,059
11-28-2015, 10:18 PM
43. ### Derivation of Distribution of Sum of Matrices in Quadratic Form

I'm having a bit of trouble starting this question. Is it right for me to assume that the sum of the Ai matrices (A1 + A2 + ... up to k) is an...

• Replies: 3
• Views: 1,628
09-16-2012, 12:34 AM
44. ### Help with nth Leverage

Deduce that the nth leverage lies between zero and one Heres my working out. (But part of it is from lectures.) I dont understand why the...

• Replies: 1
• Views: 1,421
09-15-2012, 02:20 AM
45. ### Question on Finding the Design Matrix

For the above question, I was wondering if someone could help me find the design amtrix in question a) It seems like from the question tat there...

• Replies: 9
• Views: 3,517
09-18-2012, 10:49 AM
46. ### Question on Finding the Least Squares Estimate (Under Certain Conditions)

The answer to b(-i.) is easy to find (i.e. when the ith observation is omitted). It is just the answer to the least squares estimate of b for the...

• Replies: 1
• Views: 1,395
10-12-2012, 06:08 AM
47. ### Basic information on binary logistic regression

Can anyone point me in the direction of a webpage that provides an overview of the binary logistic regression technique and ideally instructions on...

• Replies: 1
• Views: 3,025
07-19-2011, 08:27 AM
48. ### Logistic Regression

I am having difficulty performing logistic regression in SPSS due to missing data. Any suggestions for controlling for missing data in logistic...

• Replies: 3
• Views: 2,539
09-11-2011, 08:14 PM
49. ### Moderation analysis problems

Hi girls and guys :) I'm pretty stuck rigth now with my moderation analysis. First of all, this is for my bachelor thesis, psychology. I've...

• Replies: 3
• Views: 3,573
05-21-2013, 02:42 PM
50. ### Interpreting a IV variable whose values have been changed

Hello all, I'd just like to get advice on the following: I've got a few independent variables which had values ranging from -2.5 to 2.5. I...

• Replies: 1
• Views: 1,046
10-27-2015, 01:32 PM
51. ### Which regression model to use with skewed & ordinal data?

I'm a bit stucked and just wondering about which regression technic to use with my dependent variable at hand. Respondents were asked to provide a...

• Replies: 3
• Views: 4,240
03-19-2013, 04:16 PM
52. ### Research Help_Regression Analysis_Log Transformation for Better Fits

Dear All, I'm doing a research on the estimation of "Tunnel Cost" for which I carried out some regression analysis based on data of 30 tunnel...

• Replies: 2
• Views: 1,480
09-07-2016, 02:26 PM
53. ### Curve fitting of individual or multiples curves

Hi, In curve fitting, Is it acceptable to perform a curve fitting of multiples curves overlaped in the same plot or is it neccesary to fit each curve...

• Replies: 0
• Views: 991
07-13-2014, 11:11 AM
54. ### Study Design for assessing efficacy of New Clinical Sign

Hi! I am looking for some guidance as to what statistical tests I would need to do to know the significance of a study. The situation is this: ...

• Replies: 0
• Views: 793
01-02-2016, 08:51 AM
55. ### standardizing residuals

Hi All, I'd like to standardize residuals. Can anybody tell me the formula to standardize to mean 0 and standard deviation 1? I also do not...

• Replies: 3
• Views: 5,553
09-10-2010, 04:35 AM

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