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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### normality assumption in regression: THE FINAL ANSWER!!!

ok, maybe it's not *the* final answer, but here's a theory of where this may be coming from. ever since noetsi started asking this question about...

• Replies: 11
• Views: 3,302
07-02-2013, 09:48 AM
2. ### R Squared and dummy variables

Hey, If you changed your model from one variable to a number of dummy variables, would the R^2 increase considerably, supposing that the dummy...

• Replies: 5
• Views: 3,300
11-03-2015, 02:11 PM
3. ### Variance of error

With the equation yi = B0 + B1xi + ei Does anyone know what the variance of ei_hat is suppose to equal? So far I have tried to split it the ei...

• Replies: 0
• Views: 3,299
08-08-2011, 01:15 AM
4. ### Linear Model Prediction

I'm working on a linear model that looks like: Price = B0 + B1(Gender) + B2(Age) + B3(Credit Type) + B4(Home) ... The predictior is price, and...

• Replies: 13
• Views: 3,298
12-21-2011, 11:06 AM
5. ### Statistical Significance

I am completing a statistics project having been given data for 30 years. I have calculated the pairwise correlation coefficients between Infant...

• Replies: 2
• Views: 3,294
01-04-2009, 03:42 PM
6. ### compare Spearman's correlations

Dear all, I performed several Spearman's correlation tests between the same independent variable and different dependent ones. All the...

• Replies: 2
• Views: 3,293
12-06-2011, 05:07 AM
7. ### regression with ranked values

I have a problem I want to make a regression analyse with a few independent variables and 1 dependent variable. The data is all ranked. The...

• Replies: 0
• Views: 3,290
07-10-2010, 05:01 AM
8. ### multiple comparisons

Hi, I'm a vet doing a research project, but am not really strong in stats. I have a question about whether correction for multiple comparisons is...

• Replies: 8
• Views: 3,288
02-13-2009, 02:12 AM
9. ### regression with categorical predictor

Hi people, i have a problem which i could not solve myself, maybe somebody can help me. i have three groups (A/A, A/B and B/B) and a continuous...

• Replies: 1
• Views: 3,288
04-17-2011, 12:02 AM
10. ### Least Squares

• Replies: 8
• Views: 3,287
09-09-2015, 06:21 PM
11. ### logistic regression with quartiles

hi all i have some data that i need to divide into quartiles. after i do this, i will have a predictor variable with 4 categories. i need to do...

• Replies: 0
• Views: 3,285
09-28-2011, 06:19 PM
12. ### Restricted cubic splines with dichotomous outcome

Do anyone know if it's possible to perform a regression using restricted cubic splies with a dichotomous outcome?

• Replies: 1
• Views: 3,284
07-03-2012, 09:57 AM
13. ### Regression interpretation

Hey guys, I'm doing an OLS regression with an ending balance (econometrics class) as my dependent variable and the S&P 500 (among others) as my...

• Replies: 0
• Views: 3,283
07-22-2011, 01:14 PM
14. ### 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: 14
• Views: 3,282
03-28-2015, 09:53 AM
15. ### Dfbeta for categorical/dummy variables

Hello :) In my regression analysis (in Stata), I'm generating dfbetas. Can we take into account dfbeta of categorical or dummy variables higher...

• Replies: 0
• Views: 3,277
06-23-2014, 08:43 AM
16. ### Graphical representation and functions of non parametric confidence intervals

I calculated the 95% confidence intervals for alpha and beta coefficients through non parametric bootstrapping (10000 iterations). Now, I'd like to...

• Replies: 2
• Views: 3,275
01-15-2012, 07:05 AM
17. ### Relative impact of an X on Y.

This is probably the most important question I get asked to do, and I have never found a great answer for it (of course there may not be one). If you...

• Replies: 17
• Views: 3,267
03-14-2017, 03:32 PM
18. ### using variance matrix

If you have a vector Q = , where Qi is a random variable, and a variance matrix var(Q) = how do you find the variance for Q1,Q2? Is there a...

• Replies: 4
• Views: 3,265
01-16-2012, 07:36 PM
19. ### Repeated measures question

Hello. I have taken day to day repeated measures in number of predictor variables as well as some other ordinal dvs. I want to meaure the effect of...

• Replies: 6
• Views: 3,265
05-31-2017, 04:14 AM
20. ### Comparison of linear and power law regression models

I'm quite a newb at statistics, with only one college-level statistics course behind me. I apologize in advance if my terminology and/or...

• Replies: 0
• Views: 3,264
eis
07-20-2011, 01:43 PM
21. ### Regression of probability distributions

I have an dataset where the y values are multiple points representing a probability distribution rather than a single discrete point. I'm trying to...

• Replies: 5
• Views: 3,263
10-12-2010, 04:45 AM
22. ### Factor in binary logistic regression?

Hi, I am currently performing a binary logistic regression, with a number of predictors. The aim is to measure the relationship between the...

• Replies: 1
• Views: 3,260
04-13-2011, 02:47 AM
23. ### Assumptions of Quantile Regression

Is equal variance an assumption of quantile regression? Does quantile or median regression have any assumptions? Thanks.

• Replies: 1
• Views: 3,257
12-12-2011, 02:07 AM
24. ### which model to use?

I have a dependent variable that is limited and discrete (it goes from -9 to 9 in whole numbers), yet the residuals produced from a linear regression...

• Replies: 10
• Views: 3,256
08-03-2011, 01:34 PM
25. ### Help creating my first logistic Regression model

Hi everyone, I`m new here, and new in the stats world, and i have several questions and need for help on how to proceed. First, what i`m doing...

• Replies: 8
• Views: 3,255
07-06-2015, 03:21 PM
26. ### Linear Regression Models (3)

β ε note: also under discussion in "Math Help Forum"

• Replies: 4
• Views: 3,251
05-19-2009, 08:03 PM
27. ### multiple regression analysis

Hi There, I am conducting multiple regression analyses using SPSS. I have an outcome variable and several potential predictors, one of which is...

• Replies: 0
• Views: 3,251
02-02-2010, 05:56 AM
28. ### Regression table interpretation problem

Hello all, I am a complete beginner in statistics but I have come across a table I need to interpret for my research. Although it's probably a...

• Replies: 8
• Views: 3,247
02-29-2012, 09:58 AM
29. ### Relative impact

I circle back to this question every few years, it is becoming critical these days and my readings have not turned up a strong consensus on this...

• Replies: 9
• Views: 3,247
06-27-2016, 11:02 AM
30. ### How to estimate change effects through time using R?

Hi I am using project R and I have two sets of datas: 1. House prices, house info (eg. sqft, rooms, lot sizes, etc), area codes, and school...

• Replies: 1
• Views: 3,246
12-05-2010, 06:45 PM
31. ### Multiple Regression Question

This is my data: Bars

• Replies: 8
• Views: 3,245
11-10-2011, 02:17 PM
32. ### simulating bias in fixed-effect dummy regressions

Earlier today I was typing up a reply to this thread (LINK), but since I don't have a lot of experience with so-called fixed-effects dummy regression...

• Replies: 0
• Views: 3,243
03-31-2012, 08:30 PM
33. ### Mixing lasso with OLS

Hi, I am looking at a data set of 45 continuous IV and 1 DV, trying to find an acceptable regression model. I tried the lasso with cross-validation...

• Replies: 4
• Views: 3,243
06-06-2014, 02:50 PM
34. ### collinearity - incorrect sign?

I read from a book that the collinearity (or multicollinearity) could possibly lead the signs of the regression coefficients to being incorrect....

• Replies: 4
• Views: 3,241
04-26-2011, 02:43 AM
35. ### [Stata - Regression with categorical variables correlated] Multicollinearity

Hello! I'm currently working on my thesis and I have a problem. I'm doing a regression where many variables are categorical ones (profession,...

• Replies: 5
• Views: 3,239
06-21-2014, 08:25 AM
36. ### Moderation Analysis through Process by Andrew Hayes and SPSS regression analysis

Hello all, I need help analyzing some data for a moderation analysis. I have a continuous variable (predictor), Exhaustion, a continuous outcome,...

• Replies: 0
• Views: 3,238
08-09-2014, 10:22 PM
37. ### reporting ordinal regression results

Hi, I have been working on analyzing a survey data using SPSS. I am supposed to use ordinal regression analysis. I have watched a couple of videos...

• Replies: 2
• Views: 3,236
04-30-2013, 03:47 PM
38. ### 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: 3,234
03-11-2015, 11:56 AM
39. ### To Classify Or Not -- Does it make sense to use income brackets?

At my job we're doing an analysis of energy usage for low income households as part of our subsidy program. Some 90,000 households are in this...

• Replies: 13
• Views: 3,233
09-11-2012, 10:10 AM
40. ### cumulative odds ratios - additive or exponential?

I have run some regression models that examine the effect of variable X (a 15 point continuous scale) on Y (a binary variable - didn't perform/did...

• Replies: 3
• Views: 3,225
10-31-2013, 11:49 AM
41. ### Interpreting multiple (IV) categorical variables in regression

The treatment in the text I have read break an independent categorical variable into k-1 dummy variables. You then compare these to reference level...

• Replies: 2
• Views: 3,217
02-04-2013, 02:15 PM
42. ### Pleease help!? Filling in "blanks" in Regression Output

Hello! Can someone please explain, I need to fill in the blanks marked They provide this info in a row: Coeff:-9074.674 Std.Err: ?? ...

• Replies: 9
• Views: 3,217
01-07-2016, 07:42 AM
43. ### Interpretation of the regression coefficient of a proportion type IV

If I want to use some proportion type independent variables in a logistic regression, then what will be the interpretation of the regression...

• Replies: 1
• Views: 3,216
01-11-2013, 06:25 AM
44. ### Algebraic Definition of Residuals from a Regression

I just need a hint on how to get started on this. Any advice? Define the residual from a regression (one independent variable) algebraically and...

• Replies: 1
• Views: 3,214
03-02-2011, 01:31 PM
45. ### I think this is a simple question but I can't seem to find it in my stats book

I have a linear regression equation (y=6.0707x-1200.2) that was used to develop 50 point estimates. The sum of these estimates is the point estimate...

• Replies: 12
• Views: 3,209
01-20-2017, 02:29 PM
46. ### Analysis of Data over time?

Hi! I am investigating animal social networks and I have long term data set spanning 15 years. I have looked at each animals 'network position'...

• Replies: 0
• Views: 3,208
12-13-2010, 06:31 AM
47. ### Multicollinearity and SigmaStat

Hello all, First, thank you for taking the time to read and answer my question! I am doing a multiple logistic regression analysis in Sigma...

• Replies: 1
• Views: 3,206
08-03-2010, 01:58 PM

Hi guys i need help badly. We were given this to solve in my first RA class and i have no idea how to begin. Please this is the first time i'm...

• Replies: 2
• Views: 3,204
09-06-2009, 09:00 PM
49. ### Nonparametric multiple regression

I want to know how to conduct the nonparametric equivalent of a multiple regression? I have 3 variables that are correlated according to spearman's...

• Replies: 0
• Views: 3,201
11-27-2009, 06:26 PM
50. ### Importance of bias in estimators

I always thought that bias was the central issue in an estimator. The one thing you had to avoid above all else and the gold standard to evaluate the...

• Replies: 12
• Views: 3,201
12-30-2014, 02:46 PM
51. ### Pros & Cons of a pooled model versus a non pooled one

Dear All, so this is what I mean, so I am looking at determinants of learning achievements of children. Cool. So now I would like to understand...

• Replies: 8
• Views: 3,195
04-16-2013, 11:45 AM
52. ### Multiple Linear Regression w/ Categorical Predictor Variables (Linearity Assumption?)

Hi, How do we test the linearity assumption for categorical predictor variables such as gender? What kind of a transformation do I need to use?

• Replies: 0
• Views: 3,188
05-01-2011, 04:04 AM
53. ### standardized parameters

Hello, can anyone help me with a brief explanation? Usually I use the "stb" model option while running the proc logistic in sas to calculate the...

• Replies: 0
• Views: 3,187
06-14-2011, 05:17 AM
54. ### Diagnostics in regression: A visual example

The follwing R-code/picture shows a simple linear regression with no outliers and 3 different kind of outliers. It also plots the diagnostic values,...

• Replies: 0
• Views: 3,186
12-13-2010, 07:01 AM
55. ### i cant understand this question :|

Hi everyone , i had small problem with this question i don't know what Sxx Syy Sxy and C.I mean? i wanna find the roles to follow but i couldn't ...

• Replies: 1
• Views: 3,186
01-20-2011, 12:04 PM

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