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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Marginal effects after biprobit

Dear Colleagues, I run a biprobit regression and all variables are significant but I found that the sign of the independent variables changes...

• Replies: 0
• Views: 4,583
11-01-2010, 04:32 PM
2. ### Panel: Interaction and centering

Hi guys, I have a panel where I want to run a fixed effects regression with an interaction term. The problem is that one factor of the term is...

• Replies: 0
• Views: 3,527
11-01-2010, 08:12 AM
3. ### Regression and Likert scale variable..HELP!

Hi everybody, I'm wondering if it is possible to run a multiple regression with a dependent variable measured on a 5-point Likert scale (where 1...

• Replies: 11
• Views: 9,404
11-01-2010, 04:45 AM
4. ### Am I doing binary logistic regression correctly?

Hi all, I have data relating to the presence or absence of electrolytes in water, and the volume of water drunk. I need to do an analysis to see...

• Replies: 0
• Views: 2,778
10-31-2010, 07:51 AM
5. ### stating the model (logistic) in my report

Hi, Sorry this might seem like silly question. But I'm wondering whats the conventional way of stating the logistic binary model when writing up...

• Replies: 1
• Views: 2,002
10-30-2010, 08:56 AM
6. ### Multiple Regression Repeated Measures with a continuous independent variable

I have a complete within-subjects 2x2x5 designs, i.e. all 12 subjects I have have done the 20 combinations of conditions. My problem is that the 3rd...

• Replies: 1
• Views: 7,352
10-29-2010, 08:47 PM
7. ### Simulated response

Hi, I have a bunch of simulated predictors and the assumed coefficients that I'm going to use. Now I need to simulate the response Y = b0 +...

• Replies: 1
• Views: 3,068
10-29-2010, 06:49 PM
8. ### Regression for Positive and Negative Integers

My independent variable is a difference in count data. I was wondering if there was a specific regression that should be used for data that contains...

• Replies: 1
• Views: 4,505
10-29-2010, 10:30 AM
9. ### Is the difference significant.

I'm using stata since only a few weeks for my thesis. I can use some help regarding the following: I wanted to know what the mean grade is for...

• Replies: 0
• Views: 4,975
10-28-2010, 10:04 AM
10. ### Determining best independent variables through factor analysis

Hi everyone, I have a dependent variable and 18 independent variables. I remember from an applied statistics class I took, that there is a way to...

• Replies: 0
• Views: 2,201
10-25-2010, 05:39 PM
11. ### Parameter stability over time

Hi guys, I am taking this introductory methods to statistics in a finance program and I need to do the following. Compare S&P500 vs TSX and...

• Replies: 0
• Views: 2,758
10-25-2010, 08:13 AM
12. ### Partial r is greater than zero-order correlation

I am puzzled by something I have not come across before. To explain, I have conducted a hierarchical multi-regression with a post-therapy outcome...

• Replies: 1
• Views: 9,138
10-24-2010, 06:05 AM
13. ### Need for Transformation?

I'm running an OLS regression. My predictors are continuous, but they are proportions that are bounded by 0 and 1. Because there are many 0s in my...

• Replies: 2
• Views: 3,856
10-23-2010, 10:40 PM
14. ### Complex stansardized Residuals

Dear all, I am doing some nonlinear regression and use mathematica to calculate the associated FitResiduals and StudentizedResiduals. I am a bit...

• Replies: 2
• Views: 2,434
10-21-2010, 12:23 PM
15. ### help for results explanation

Hey all, I do a bivariate probit regression, and to test heteroscedasticity I used linear regression and got the next results, so what do you...

• Replies: 0
• Views: 2,219
10-21-2010, 06:24 AM
16. ### Help with non-linear regression, SPSS

Hey all New to the forums and was hoping for some help with writing out part of a non-linear regression model from somebody brighter than me. So...

• Replies: 2
• Views: 5,539
10-19-2010, 10:02 AM
17. ### Basic Help with Multiple Regression Results

Can you help? I'm trying to run a basic multiple regression in SPSS 18. I have a series of measurements made in cm, and I want to find the...

• Replies: 0
• Views: 2,069
10-18-2010, 12:30 PM

Hi, all I am working on a bivariate probit model and I nearly got the results, but I have no idea to check about collin.... and hetro... problems....

• Replies: 2
• Views: 3,856
10-18-2010, 04:20 AM
19. ### Spurious or not? a little help for a newbie

Hi to all, I am relatively new to statistics and I try to do my best. I will appreciate any helpful inputs form you. First, I had to generate a...

• Replies: 0
• Views: 2,134
10-17-2010, 10:57 AM
20. ### Stupid Question: Help This Noob with Parking

:o Hi, I have been knocking my head against the wall of statistics (so to speak) for uncounted hours and just can't figure this out. I cannot...

• Replies: 1
• Views: 3,854
10-15-2010, 11:53 AM
21. ### collinearity and Heteroscedasticity in bivariate probit model

Hi, all I run a bivariate probit regression, and I am not specialized in statistics and I dont know how to check collinearity and...

• Replies: 0
• Views: 5,713
10-14-2010, 03:32 PM

My results of covariance ratio (influence statistic) is always different as for example the SPSS output. I don’t know where is my failure. Could...

• Replies: 0
• Views: 3,896
10-14-2010, 03:09 PM
23. ### Correlation and Regression Assignment Using BRFSS

"For this assignment you must collect some state-level variable of your choice and merge it to the BRFSS individual-level data (matching by state...

• Replies: 0
• Views: 2,774
10-13-2010, 09:28 PM
24. ### Linear Regression for Traffic Data

Hi there, I have a two full years of traffic data by month and I am trying to predict traffic for the next two years based on historical growth...

• Replies: 3
• Views: 4,802
10-13-2010, 11:25 AM
25. ### Meaning of Logarithmic Trend Line

Hello Everyone I was just curious as to the meaning of the slop in an Excel logarithmic trendline. For example, y = -0.039ln(x) + 1.6792, where x...

• Replies: 0
• Views: 5,217
10-13-2010, 10:45 AM
26. ### Regression analysis research project help.

Hi, I have a project i have to do for my regression analysis course. Basically I need to gather a bunch of data and plot it and find a regression...

• Replies: 1
• Views: 6,742
10-12-2010, 01:07 PM
27. ### Method to calculate the most accurate method of prediction

Hi, this is my first post, and I'm entirely self taught re statistics, so go easy on me. :) I want to calculate which of several prediction...

• Replies: 1
• Views: 6,159
10-12-2010, 01:04 PM
28. ### 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: 3,256
10-12-2010, 04:45 AM
29. ### Significant Correlations - No Sig Beta Weight

Hi guys, I'm hoping that someone can clear up my confused state of mind...:( I have conducted a standard MRA and my problem is that even though...

• Replies: 2
• Views: 5,092
10-11-2010, 05:20 PM
30. ### Interpolation

Hello. Two questions: First, what would be the most suitable method for interpolation where the data is: 1. Mostly increasing with an...

• Replies: 0
• Views: 2,016
10-11-2010, 01:36 PM
31. ### Logistic regression. biological significance of a mathematical model quadratic term.

See if anybody can help me understand something, as I am a bit confused. It is regarding the biological significance of a mathematical model...

• Replies: 2
• Views: 4,460
10-11-2010, 07:15 AM
32. ### bootstrap correlation

Hi, I am wondering if is it correct to use bootstrap methods to get an estimate of correlation coefficient (Pearson) when data violate some of the...

• Replies: 2
• Views: 5,674
10-08-2010, 02:09 AM
33. ### is there a non parametric alternative to multiple linear regression?

Hi all, I would like to know is there a non parametric alternative to multiple linear regression? when I google the quesion I get a lot of info...

• Replies: 7
• Views: 27,956
10-07-2010, 03:37 PM
34. ### Logistic regression with dependent variables

Dear All I'm trying to perform logistic regression to determine risk factors for retinopathy of prematurity (ROP). The outcome is binary 1=...

• Replies: 4
• Views: 5,775
10-06-2010, 06:35 PM
35. ### theory proofs

Hi, I am doing a study guide for my stat test coming up, and got stuck on 3 proofs. They seem a bit confusing to me, and I just keep going in circles...

• Replies: 1
• Views: 4,098
09-30-2010, 04:09 PM
36. ### Var(Y_knot_Hat)

Hello all, I need a little help with this: Show Var(Y_knot_Hat) = Sigma^2 * (1/n + (x_knot - x_bar)^2 / Sxx) Start with Y_knot_hat = b_knot...

• Replies: 5
• Views: 4,087
09-30-2010, 01:07 PM
37. ### polytomous regression - help obtaining p for heterogeneity

I am using polytomous (aka multinomial) logistic regression to analyze some data. My outcome/dependent variable is nominal (unordered) with 4...

• Replies: 1
• Views: 5,002
09-25-2010, 06:58 PM
38. ### cox regression and change

I'm no statistician, but a porgrammeur. I have some statistics during my study, but is not really one of my stektste points. 'm Trying to calculate...

• Replies: 0
• Views: 2,184
09-24-2010, 09:27 AM
39. ### Interpreting an order logit

This isn't my homework, but was acctually meant for my blog. I had planned on running the ordered logit models, running predicted probabilities and...

• Replies: 0
• Views: 2,273
09-23-2010, 07:33 PM
40. ### Help with VAR, SVAR model

Hi, I have to plot impulse response function for my research paper and I have never studied vector autoregressive models. So I am hoping someone...

• Replies: 0
• Views: 2,551
09-23-2010, 06:04 PM
41. ### ANOVA table insignificant in Regression

Greetings!!! Regression analysis produced ANOVA table insignificant. Please confirm if I should report regression results. Thanks Rayyan

• Replies: 6
• Views: 12,951
09-23-2010, 04:43 PM
42. ### Using Odd values for variable selection in logistic regression

Hello, I have a question about independent variables selection when a logistic regression is used as classification method. Is it an acceptable or...

• Replies: 0
• Views: 2,676
09-22-2010, 12:05 PM
43. ### Testing IIA in MNLM with Hausman-McFadden

Dear all, I'm having some problems with the IIA property violation test of Hausman McFadden. I estimated two MNL models based on 3 predictors:...

• Replies: 0
• Views: 3,141
09-22-2010, 08:35 AM
44. ### Plotting output from logistic regression???

I ran a quasi-likelihood logistic regression using S-plus and have a question about how to plot and interpret the results. How can I construct...

• Replies: 0
• Views: 3,885
09-21-2010, 05:35 PM
45. ### multivarient nonlinear regression in SPSS

is there are way of doing this in SPSS? I have looked around and come to a blank... I need to derive an equation to describe the (most likely...

• Replies: 0
• Views: 3,896
E_J
09-21-2010, 08:58 AM
46. ### Descriptive research and regression analysis?

Please pardon my ignorance...can I use multiple regression analysis in a descriptive research design to answer my hypotheses? If not, can anyone...

• Replies: 4
• Views: 8,395
09-19-2010, 01:11 PM
47. ### disattenuated correlations

Objective: a guess about the actual correlations between two variables based on correlations between somewhat noisy variable estimates. The variable...

• Replies: 0
• Views: 4,084
Per
09-18-2010, 01:39 AM
48. ### How do i create "nice" prediction hyperbola?

I would like to create a nice prediction hyperbola in my regression analysis, at this moment i am only getting some rather ugly ones and only where i...

• Replies: 3
• Views: 3,568
09-16-2010, 03:55 PM
49. ### Standard error of regression

I am writing a robust regression algorith in Python and using the linregress method from SciPy/NumPy. linregress returns the b0, b1, r^2, p_val, and...

• Replies: 2
• Views: 6,272
09-16-2010, 02:35 PM
50. ### Low R-squared, but my variables fit expectations

So I ran a regression on 3 different sets of data estimation techniques versus actual survey data. The dependent variable was the non-survey...

• Replies: 1
• Views: 13,676
09-16-2010, 10:55 AM
51. ### Four-way interaction in linear regression

Dear all, I have 4 independent variables, and I want to check their combined and interrelated effects on 1 dependent variable (thus 1 y and 4...

• Replies: 2
• Views: 9,870
09-14-2010, 01:33 PM
52. ### Comparing model fits of non nested models

Dear all, I am a student in Sociology at the University of Amsterdam and currently working on a paper on which I got stuck. Let me briefly...

• Replies: 0
• Views: 3,930
09-14-2010, 02:56 AM
53. ### Constant Variable

Hi folks, I was wondering if you could help me understand a problem I have with a regression. Basically, SPSS excludes one of my variables...

• Replies: 2
• Views: 17,668
09-13-2010, 12:38 PM
54. ### Participant ID - Categorical?

Hi all, I'm performing a Binary Logistic Regression on data from human subjects. I want to ensure that the effect of independent variables is...

• Replies: 0
• Views: 4,002
09-13-2010, 09:44 AM
55. ### "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: 2,490
09-13-2010, 07:57 AM
56. ### 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: 2,729
09-12-2010, 07:38 PM
57. ### 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: 5,585
09-10-2010, 04:35 AM

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: 4,530
09-09-2010, 03:49 PM
59. ### BOX-COX transformation - Correct method

Dear All, I fitted a quadratic model to a set of data. I am trying to apply the box-cox transformation to check if my data should be transformed....

• Replies: 2
• Views: 10,395
09-08-2010, 09:44 AM

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