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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Can anyone help me with a significance problem?

Hi Everyone, I am running a linear regression for the years 2005 and 2006 for my thesis in which I investigate the relation between having a big...

• Replies: 0
• Views: 1,276
05-02-2014, 04:51 PM
2. ### Can covariates be random variables? (logit)

Hi Everyone. I have been discussing a project at work. My colleague said that he is going to estimate a logit model and include as a covariates...

• Replies: 5
• Views: 1,857
04-18-2016, 05:32 PM
3. ### Can data be classified as count data?

Hi, I have a dataset spanning two years which consists of individuals entering some process. Once they have entered this process I want to predict...

• Replies: 2
• Views: 2,672
01-15-2017, 08:38 AM
4. ### Can fixed effects models be used on cross sectional data?

1) Does it make sense to use a fixed effects model on cross sectional data (note, not time-series cross sectional data) if the goal is to account for...

• Replies: 0
• Views: 1,017
01-04-2016, 09:46 PM
5. ### Can I analyse R-SQ values for different groups using a T-Test?

Hi, I am currently doing a piece of analysis which is now starting to confuse me in terms of what statistical analysis I should apply. My Data:...

• Replies: 0
• Views: 1,417
11-13-2013, 10:52 AM
6. ### Can I combine PCA terms with real variables?

Hello, I'm new to this forum. Hopefully I am doing this right! I am trying to do a multiple regression analysis on a data set that has about 250...

• Replies: 0
• Views: 1,533
03-24-2014, 04:47 PM
7. ### Can I compare models like this ?

Hi, I was trying to fit a linear regression model (simple), for a set of data that shows a very strong linear relation between X and Y. Linearity...

• Replies: 3
• Views: 1,856
07-05-2011, 01:46 AM
8. ### Can I compare regression models with same # predictors and same sample?

Hi there, As a part of my dissertation I want to compare a focal, new, variable against other well-known predictors of my outcome, so I plan to...

• Replies: 7
• Views: 1,788
04-28-2014, 11:49 AM
9. ### Can I derive a standard error from a regression table, and do I need to???

I am not sure if this can be done, so I would appreciate any insight. I only have a regression table that has IVs with unstandardized and...

• Replies: 2
• Views: 1,578
10-29-2011, 07:38 AM
10. ### Can I do this?

Hey everyone :) I was wondering if I could do this. I have a dependent variable that is age. N = 228. Each participant answered a question which I...

• Replies: 0
• Views: 1,657
07-28-2011, 08:32 AM
11. ### Can I draw an interaction plot using Generalised Estimating Equations (GEE)?

Hello, Can I draw an interaction plot using Generalised Estimating Equations (GEE)? If yes, how? Thanks.

• Replies: 0
• Views: 581
08-16-2015, 09:42 AM
12. ### can I regress first difference on another first difference in cointegration test

Hello everybody, I have monthly data on world and domestic prices. The model I need to estimate is log-log model (logpdomestic=loga+logpworld+u). So...

• Replies: 1
• Views: 1,389
01-14-2013, 02:07 AM
13. ### Can I transform the principal components...?

Hi all. I am using PCA to generate PCs and then using them as independent variables in regression. I added an extra data-step after PCA which is...

• Replies: 0
• Views: 1,843
szm
03-14-2013, 01:48 PM
14. ### Can I trust a regression if variables are autocorrelated?

Hello everyone! Both variables (dependent and independent) show autocorrelation effects. When I run regression and estimate the residuals, they...

• Replies: 6
• Views: 2,756
12-04-2011, 10:59 AM
15. ### Can I use group mean centered variables in an OLS regression?

Hi everyone, I have a question about some analyses I'm working through. I originally ran the model as an HLM because of the nested structure of my...

• Replies: 0
• Views: 1,840
01-02-2014, 03:41 PM
16. ### Can I use mediation with my data?

Thanks for taking the time to read this in advance it is quite detailed, but I'm currently working on my psychology honours dissertation, and due to...

• Replies: 2
• Views: 3,425
09-13-2009, 01:27 AM
17. ### Can I use multivariate analysis without univariate analysis?

Dear all, I have a problem in my data analysis and paper writing. Some variables (dependents) were not statistically significantly correlated...

• Replies: 14
• Views: 23,718
01-26-2016, 11:08 AM
18. ### Can i use regression analysis for this problem?

Hi So im doing a study and i want to see if there is a trend here What i got: I got data that depends on if a certain animal is using a area (low...

• Replies: 1
• Views: 1,252
04-04-2014, 07:55 PM
19. ### Can I use regression with a variable that is ordinal?

I hope that I am posting this in the right place- and I apologize if this has been addressed. I tried to look for it but couldn't find a similar...

• Replies: 1
• Views: 1,557
01-05-2012, 11:37 PM
20. ### Can I use regression with this type and amount of data?

Greetings all. First time poster here and I hope I can find some help. I have looked around this site and on Google for an answer to my questions but...

• Replies: 1
• Views: 1,449
08-13-2013, 10:07 AM
21. ### Can logistic regression give opposite results than univariate analyses?

Dear anyone I am studying the risk for taking drug X. My study population includes >500 people. I have a list of variables (gender, age…)...

• Replies: 4
• Views: 2,746
10-11-2013, 03:25 AM
22. ### Can RSS be decreased to 0 when dimension increases?

Let's consider a simple example: I have two attributes X1 and X2, each has n values; response variable is Y. Using the two attributes together to...

• Replies: 7
• Views: 3,345
12-11-2011, 01:07 AM
23. ### Can someone help me interpret this data?

I'm performing multiple regression for an international relations thesis regarding various predictor variables and the outcome of intervention in...

• Replies: 5
• Views: 1,140
06-19-2016, 06:58 PM

I am a master's student in Environmental Management and have conducted a stated preference experiment in which I presented respondents with two...

• Replies: 0
• Views: 2,643
03-30-2011, 10:36 AM
25. ### Can stepwise regression be conducted nonparametrically?

Hi, I have some data that has shown significance with some variables using SAS mm estimator nonparametric regression, whereas the log transformed...

• Replies: 0
• Views: 1,137
06-23-2012, 02:05 PM
26. ### Can the PCA scores be used as variables in multiple linear regression

Hello, I used PCA to reduce the dimensions of a data set of 10 variables into 2 principal components (describing 82% of variance in data set of 10...

• Replies: 6
• Views: 1,899
08-31-2014, 04:04 AM
27. ### Can we really(theoretically) generalize fixed regressor linear regression?

If we have stochastic regressors, we are drawing random pairs $(y_i,\vec{x}_i)$ for a bunch of $i$, the so-called random sample, from a fixed but...

• Replies: 3
• Views: 1,588
05-30-2016, 09:16 PM
28. ### can you extrapolate a moving average WAy into the future????

Hi, I have monthly sales data. I have been asked to do a time series moving average??? If I do a 2 month moving average I can only predict...

• Replies: 3
• Views: 4,361
01-10-2013, 05:34 PM
29. ### Can you guys check these for me

Shade answers to T/F questions and type letter answer to multiple choice questions next to problem number. Chapters 13 & 14 included. T F 1. If a...

• Replies: 1
• Views: 5,694
12-08-2008, 03:33 PM
30. ### Can you help me identify the right test for my data?

I’m trying to identify the right statistical method to use. Here’s a case analogous to mine: Let’s say I’m interested in whether basketball team...

• Replies: 0
• Views: 1,280
11-06-2015, 06:19 PM
31. ### can you help me interpret this?

Vitamin D varies with season, below is a method of de-seasonalising vit D from literature. I'm not too sure what they've done after regressing the...

• Replies: 4
• Views: 1,704
01-04-2014, 10:50 AM
32. ### Can you include X1/X2 in a model when you've already included X1 and X2?

Can you include X1/X2 in a model when you've already included X1 and X2? For example, I am trying to predict housing prices. X1=square feet and...

• Replies: 4
• Views: 718
04-11-2017, 02:59 PM
33. ### Can you predict a categorical outcome with multiple regression?

Hello - I want to predict an employee will be likely to leave a company based on variables such as tenure, age, function (categorical), # of...

• Replies: 1
• Views: 1,235
11-30-2013, 06:41 AM
34. ### Cant do a linear regression on a subset of my data: Error

I installed the R package AER, from which you get the data PSID1982. Then I define this model: data("PSID1982") set.seed(15606) ...

• Replies: 0
• Views: 534
01-17-2016, 11:53 AM
35. ### CARs from small sample(26): Which Regression is the best to perform?

Dear All, I am new to this forum, but I am trying to become more and more specified in statistics for my Master Thesis (Erasmus University...

• Replies: 5
• Views: 3,426
07-23-2012, 02:13 PM
36. ### 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: 12,508
08-17-2010, 09:54 PM
37. ### Categorical data tested for several factors: which test should I use?

Hi guys, I'm currently doing a research project as part of my internship on mangrove damage along a river as a consequence of a major flood...

• Replies: 4
• Views: 1,403
05-14-2014, 11:53 AM
38. ### Categorical dependent variables / ANOVA

Hi all! Newbie here. In my current work role, I'm thought of as an expert on stats. This is totally untrue - but it doesn't take much to be seen...

• Replies: 14
• Views: 2,923
03-10-2014, 09:27 AM
39. ### Categorical multiple linear regression analysis - what would you do?

Noob here. I'm doing a project to determine how different factors (race, insurance status) are related to distance from pediatric urologists. I'm...

• Replies: 4
• Views: 1,099
09-05-2016, 07:16 PM
40. ### Categorical predictors in multiple regression

Hi, I have a question my thesis advisor cant help with. I'm trying to test the hypothesis that ambivalence towards eating meat is moderated by...

• Replies: 1
• Views: 2,056
07-05-2011, 06:35 PM
41. ### categorical predictors with multiple categories in logistic regression

Hi, I have a predictor X with 6 classes (X1, X2, X3, X4, X5, X6) in a logistic regression model. The p value for the class of reference (X1) is...

• Replies: 1
• Views: 2,076
03-29-2014, 08:32 PM
42. ### Categorical regression question

Hi, everyone Hope the experts here can help me out with a question. I have a database with several respondents providing data on...

• Replies: 5
• Views: 4,024
07-13-2010, 02:47 PM
43. ### 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: 1,990
04-12-2013, 11:28 AM
44. ### Categorical variables - Logistic regression

Hello, I am trying to run a logistic regression model. I have 4 numeric and 1 categorical variable which are significant. The categorical...

• Replies: 5
• Views: 3,886
03-07-2012, 02:06 PM
45. ### Categorical variables and interaction in MLR

Would it be correct, to add in multiple linear regrression interaction between two categorical variables (i transformed them - dummy variavles) with...

• Replies: 9
• Views: 3,368
11-19-2011, 04:14 PM
46. ### Categorical variables changing by their groupmean

Hi For a project I need to model industrial data. Large part of the dataset consists out of nominal categorical variables (430 variables in total...

• Replies: 0
• Views: 1,029
03-08-2016, 05:20 PM
47. ### categorical variables in proc logistic

Hi together, i'm using proc logistic to optimize a model for closures on an insurance in dependence of several categorical variables. Due to...

• Replies: 2
• Views: 2,298
01-13-2012, 08:05 AM
48. ### categorical variables in regression analysis and interaction terms

I am learning multiple regression with categorical variables and in a book I came across this problem. For yield of corn suppose there are two...

• Replies: 1
• Views: 2,455
07-02-2014, 01:33 PM
49. ### Causal mediation analysis with lagged endogeneous regressors

Hello dear forum members! So, in the study I am currently working on, I have the following (simplified) Poisson panel model with fixed-effects...

• Replies: 1
• Views: 981
06-12-2016, 11:56 PM
50. ### Cave Temperature Analysis, Real life management issues.

Hi, I've taken math course's up to Calc III and Diff Eq, but never a statistics course. So I was hoping this forum could help me. I am working...

• Replies: 0
• Views: 933
09-02-2016, 12:13 PM
51. ### Cenetering: Not that hard (unless you don't fully get it)

I'm a hands on visual learner. So I read about: gran mean and group mean centering. I also read this seminal piece by Enders and Tofighi:...

• Replies: 2
• Views: 1,464
03-10-2014, 09:24 AM
52. ### centered polynomials

in a model involving Y= B0 + B1X1 + B2X2^2, how does centering the model affect the parameters. why does the hypothesis test associated with B2...

• Replies: 1
• Views: 4,190
11-23-2010, 01:01 AM
53. ### Centered simple betas should be =?

I'm reading Aiken and West Multiple Regression: Testing and Interpenetrating Interactions (p. 33-34) Assume CENTERED means: X_i-\bar{X}_i They...

• Replies: 2
• Views: 2,321
10-18-2011, 08:09 PM
54. ### Centering and transforming

Hello, I'm performing a multiple regression analysis and have a question about transforming variables. I am using two IVs to see if there are...

• Replies: 1
• Views: 3,029
08-28-2008, 05:05 AM
55. ### Centering IVs for checking interaction effects in regression analysis

Attention: I have just skimmed an article (Echambadi, R. and Hess, J.d. (2007) Mean-Centering Does Not Alleviate Collinearity Problems in Moderated...

• Replies: 0
• Views: 1,642
02-07-2012, 10:36 AM
56. ### 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: 1,392
03-16-2015, 05:04 PM
57. ### change in significance level (univariate vs multivariate)

I have 3 independent variables, X, Y and Z when I do univariate regression on each of them, the t-statistics are -4.7, 1.8 and 2.2, respectively....

• Replies: 4
• Views: 5,100
10-25-2011, 10:09 AM
58. ### Change regression model ($x^*_i = x_i -10$)

Hi there.:wave: I'm solving an exercise on multiple linear regression. Near the end I will be asked for the same data as the previous model, it is...

• Replies: 5
• Views: 2,348
06-26-2016, 04:18 AM

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