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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Overdispersions and logistic regression

Note the following comment on this: I have never been clear what the difference between grouped and ungrouped data is. My elements, notably...

• Replies: 8
• Views: 4,147
09-20-2014, 08:04 AM
2. ### Adjusted R-squared

Hi, I have a few questions. If I am doing linear regression with only one independent variable, is it ever viable to present an adjusted...

• Replies: 6
• Views: 2,486
09-19-2014, 09:55 PM
3. ### Testing whether two related slopes/intercepts are different from each other

Hi, I'm new and stuck. I want to see if the intercepts and slopes of two linear regression lines are significantly different. I thought I found...

• Replies: 10
• Views: 2,496
09-19-2014, 01:43 AM
4. ### how to calculate R values

Hello members, I have no of observation (n), no of predictors(k) and stand error of estimation(se). Can it be possible to calculate R or RSquare...

• Replies: 1
• Views: 1,467
09-18-2014, 11:31 AM
5. ### Coefficient of determination interpretation

Hey guys, this my first post in here so hello everyone:) I have a question regarding the coefficient of determination. Wikipedia says: An...

• Replies: 4
• Views: 2,042
09-17-2014, 04:58 PM
6. ### Assumption of Linearity not fulfilled - what to do?

Dear All, I want to conduct a moderated hierarchical regression. I have 3 IVs and one moderator. I started to test the underlying assumptions of...

• Replies: 1
• Views: 3,393
09-17-2014, 02:53 PM
7. ### Help to prove the relationship of regression coefficients of total data and sub-data

Hello, The regression of total data set is:Y=aX+b0 The total data set is divided to two data sets. The regressions of the two sub data sets are:...

• Replies: 8
• Views: 2,311
09-16-2014, 11:44 PM
8. ### Geometric Slope

I am reading a paper that in the "Methods", it is only stated multiple linear regression conducted. In the results it reports the "geometric slopes"...

• Replies: 2
• Views: 1,584
09-15-2014, 11:57 AM
9. ### Interpretating poisson regression output correctly to wirte in results from R

Hi. I've done a poisson regression on count data in r. I need to write up the results for it but have very little idea where to start because the p...

• Replies: 0
• Views: 2,262
09-14-2014, 07:13 AM
10. ### Regression with 0 intercept

Hi, I'm taking a regression analysis class and its been a while since I took calc (a few years ago) and Im having some trouble with doing proofs of...

• Replies: 3
• Views: 2,016
09-14-2014, 12:51 AM
11. ### regression or remosre??!!

what are the differences between remorse and regression????????????????????

• Replies: 8
• Views: 3,614
09-13-2014, 05:19 AM
12. ### Preliminary Analysis in MultiLevel Analysis

Hallo there, my name is David. I am currently trying to do a multi level analysis. I am attempting a simple multilevel analysis. One of my...

• Replies: 0
• Views: 1,102
09-13-2014, 03:33 AM
13. ### Analytical solution to correlation between two linear combinations of values

Greetings, Suppose I have two linear combinations of values as follows: Y1 = B11*X1 + B12*X2 + B13*X3 Y2 = B21*X1 + B22*X2 + B23*X3 where...

• Replies: 3
• Views: 1,741
09-12-2014, 02:00 PM
14. ### non linear least squares

Hi everybody. I need some help with this: I am fitting some data about mortality to some hazard funtions like weibulll, lognormal, logistic...

• Replies: 0
• Views: 1,140
09-10-2014, 09:33 PM
15. ### Choice of final model

There are many strategies for selecting a final model (and which variables are in the final model will likely influence the SE and the coefficients)....

• Replies: 11
• Views: 2,578
09-10-2014, 11:55 AM
16. ### Correlation for different level of volatility

Hi, I need to estimate correlation between 2 variables across quantiles of volatility (volatility is an independent variable).. I want to show how...

• Replies: 0
• Views: 1,382
09-09-2014, 11:37 AM
17. ### Probability distribution of a prediction

Hi all, I'm a newbie here so apologies if I missed a similar thread. Looked for it, but couldn't find it. Let's say I've estimated a linear model...

• Replies: 0
• Views: 1,084
09-09-2014, 08:28 AM
18. ### Interpretation of interaction variables

Hi everyone I have two datasets A and B with mutually exclusive observations and I run two identical regressions (x = y) for A and B each...

• Replies: 0
• Views: 1,435
09-08-2014, 11:20 PM
19. ### cox regression

I am new to this method, so I started this thread for questions on it. :p Some discussions of Cox treat it as a counting process and others do...

• Replies: 4
• Views: 2,149
09-08-2014, 02:16 PM
20. ### Poisson regression

Hello, im analyzing an article for my studies with the hypothesis if a change in work motivation ist related with a change in mental well being...

• Replies: 0
• Views: 1,556
09-08-2014, 10:06 AM
21. ### compare beta subgroup from total group - two dummy variables

My plain regression looks as follows: tendaystockreturn = alpha + beta * dummy variable that takes a value of 1 in case a director purchases...

• Replies: 1
• Views: 2,107
09-04-2014, 01:47 PM
22. ### Simple Linear Regression with Transformed Variables

I ran a simple linear regression (length of stay predicts cost). I natural log transformed both the dependent and independent variables. I am...

• Replies: 3
• Views: 2,289
09-03-2014, 05:49 AM
23. ### Supervised learning on sporting events (Data prep)

I'm playing around with the prediction of sporting events, my data looks something like this. A single row for each team and the stats. Team ...

• Replies: 2
• Views: 1,274
09-02-2014, 01:42 AM
24. ### 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: 1,893
08-31-2014, 04:04 AM
25. ### Confused: Mixed model, step-wise regression, testing for random effects

Dear all, I want to perform a MLR (mixed model) on a data set (details below) that has both numeric and categorical explanatory variables. The...

• Replies: 0
• Views: 1,240
08-30-2014, 04:53 AM
26. ### Regression Using Interaction Terms - PANEL DATA

Good afternoon, I am working with a panel data with more than 2000 observations and only two years. My topic is on "Full Risk Insurance" in...

• Replies: 0
• Views: 1,504
08-29-2014, 01:02 PM
27. ### Mixed Model Regression in SPSS

Hello, I have a random group of participants that answered questions on a survey regarding their general opinions on specific health activities....

• Replies: 0
• Views: 1,259
08-28-2014, 07:58 AM
28. ### Pasimonious Model for Neural Networks forecasting, I am really confusing.

Hello People I recently studied Neural Networks forecasting and some interesting question arose while I am reading various articles on the net. ...

• Replies: 0
• Views: 1,153
08-27-2014, 06:56 PM
29. ### Non-parametric regression

I am relatively new to this so excuse my ignorance. As best I can tell non-parametric regression has no coefficients (no slopes). It does have...

• Replies: 8
• Views: 1,771
08-26-2014, 10:25 AM
30. ### Linear or non-linear regression model

Hi, I have 20 independent variables and 1 dependent. I've used the stepwise method to determined what predictors are more significant compared to...

• Replies: 1
• Views: 1,410
08-26-2014, 12:31 AM
31. ### Comparing 2 best fit lines for 2 halves of a data set

I have a data set with ~200 coordinates plotted on a scatter plot. I can either use the data set as is, or split this plot into two data sets along a...

• Replies: 0
• Views: 975
08-25-2014, 06:13 PM
32. ### Regression where IV/predictor is a proportion, bounded by 0 and 1

Hi, I know that if the outcome variable is a proportion, I'd need to run a beta regression, but can anyone advise on running a regression where...

• Replies: 0
• Views: 1,283
08-25-2014, 07:32 AM
33. ### Statistical Analysis help for thesis - Correlation, Probit, Tobit and Moderation

Hello Talkstats users! I am writing here cause I need some guidance on my statistical analysis which has turned out far too complex for my...

• Replies: 0
• Views: 1,288
08-25-2014, 05:42 AM
34. ### Which approach to use? Repeated measures with a covariate

Hi, I hope that someone can give me a pointer please. I am trying to determine which is the most appropriate test to apply to my data. I have...

• Replies: 0
• Views: 976
08-24-2014, 07:44 AM
35. ### Beta NO Intercept purpose

Hey guys, What would a Beta with NO intercept tell me about a time series model?

• Replies: 0
• Views: 1,186
08-23-2014, 06:19 AM
36. ### Adding dummy variables let significance of coefficients disappear

Hi all I have a regression with two variables x1 and x2, both are significant. When I add a dummy variable D (which is significant), one of the...

• Replies: 3
• Views: 2,318
08-22-2014, 07:14 AM
37. ### Strong Predictor

Hi guys! I have a question... I'm trying to fit 4 predictors to regress on abdominal fat. Multicollinearity was checked for, and all the other...

• Replies: 3
• Views: 1,826
08-22-2014, 02:27 AM
38. ### Are there model specification tests for Two Stage Least Squares (2SLS)?

Question. Are there model specification tests for Two Stage Least Squares (2SLS)? I am trying to estimate the parameters (B1, B2, B3) of the...

• Replies: 0
• Views: 1,322
08-21-2014, 01:23 AM
39. ### Regression confusion

I am looking at relationship between GHQ12 and treatment. Just wondering is it suitable to do regression analysis on this? But which would be my...

• Replies: 3
• Views: 2,054
08-20-2014, 01:52 PM
40. ### mixed predicator types for building logistic regression model

There has a data set, some predicator variables are of categorical types, such as X1={A, B,C}; X2={1, 2, 3}; and other predicator variables are of...

• Replies: 0
• Views: 955
08-18-2014, 02:22 PM
41. ### Multivariate Regression when Independent Variables could have Dependencies

First post, have looked and could not find this question elsewhere. Struggling with this so hopefully someone can help. I am trying to predict the...

• Replies: 0
• Views: 861
08-18-2014, 11:08 AM
42. ### Linear regression with an interaction variable

I have a linear regression model: Dependent variable = α + independent variable 1 (continuous variable) + independent variable 2 (categorical) +...

• Replies: 0
• Views: 1,308
08-18-2014, 10:30 AM
43. ### linear specification vs. logarithmic specification

Dear all When I do a box-cox test to evaluate whether to use a logarithmic transformation for my dependent variable (which are IRRs, and the...

• Replies: 2
• Views: 1,191
08-18-2014, 07:48 AM
44. ### Multiple Linear Regression Problem

Hi, I want to do a multiple regression analysis. I have one Y which are numeric values (sample number = 85) and the following Xs. Sr...

• Replies: 1
• Views: 899
08-18-2014, 01:13 AM
45. ### The absolute dependence in panel data

Hello, I want to ask something related to the panel data analysis. In traditional regression and correlation analysis, it is clear that if the...

• Replies: 1
• Views: 1,188
08-15-2014, 01:39 AM
46. ### Generalised Linear Model - with negative skewed DV

Hi All, I am trying to fit a generalised linear model to which the dependant variable is negatively skewed. The DV ranges from 0 to 150 with 45%...

• Replies: 0
• Views: 2,162
08-14-2014, 10:52 PM
47. ### Help: Bootstrap Regression (or not)

I am an ecologist with enough statistics background to know I am confused. The trophic magnification factor (TMF) is a commonly used measure to...

• Replies: 0
• Views: 1,062
08-14-2014, 10:36 AM
48. ### When to use partial bivariate correlation and when to use multiple linear regression?

Let's say I have X and Y and wonder how strongly they correlate, but am suspecting that Z is a confounder. What research question would lead me...

• Replies: 1
• Views: 1,043
08-14-2014, 08:23 AM
49. ### Interpretation CATREG interaction coefficient

Hi everybody. I have done an Catreg analyses on my data and have included interaction variables (for example nutrient * sex). However sex is...

• Replies: 2
• Views: 1,458
08-14-2014, 01:48 AM
50. ### Problem/question regarding Cox Regression

Hello! I am new to statistics and research and am looking for a little help. I am doing a study looking at the the effects of post-operative...

• Replies: 1
• Views: 1,126
08-13-2014, 08:39 PM
51. ### Moderator regression: plotting graphs from multiple product terms

This is my first time posting, so apologies if I don't make sense. I've conducted a hierarchical regression analysis. I have multiple IVs whereby...

• Replies: 0
• Views: 941
08-13-2014, 10:57 AM
52. ### Plot for multiple regression

Hi All, I have a very basic question. When I run a regression to predict Y from X, I basically draw a scatterplot in excel. I am wondering how...

• Replies: 9
• Views: 2,831
08-12-2014, 06:03 PM
53. ### Robustness check of univariate results

Hi all I calculated several univariate regressions with different explanatory variables. Some are significant, while others aren't. Some show the...

• Replies: 0
• Views: 1,705
08-12-2014, 04:13 PM
54. ### Cox proportional hazard

I am trying to understand how to interpret the change in the hazard function for a one unit change in a dummy predictor. I know for a continuous...

• Replies: 3
• Views: 1,672
08-12-2014, 01:00 PM
55. ### Logistic regression, but no negative responses?

So I am trying to model who is likely, from a list of addresses, to go to a store. I have lots of criteria about the people who have visited my...

• Replies: 5
• Views: 1,331
08-12-2014, 10:38 AM
56. ### Moderated regression - how to create the graph for some (not all) variables.

I've run into a problem and I was hoping someone could help me out. My research question is whether beliefs about controllability of weight...

• Replies: 0
• Views: 1,163
08-12-2014, 05:13 AM

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