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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Least square estimates

(y1, x1)...(yn, xn) and (w1,x1),.....(wn,xn) are independent oberservations where x1...xn are fixed constants. Suppose we fit the first model yi = a1...

• Replies: 3
• Views: 5,182
BGM
08-22-2011, 11:49 PM
2. ### Relative contribution of variables in logistic regression

Hi, I have been using logistic regression to determine what influences the chances of a person becoming unemployed. A number of variables have all...

• Replies: 5
• Views: 20,165
08-23-2011, 05:18 AM
3. ### Regression Help for Masters thesis

..........

• Replies: 4
• Views: 6,148
08-24-2011, 12:55 AM
4. ### Poisson regression and effects of predictors

Dear all, I just registered this forum too, since I am in doubt what to do! In a study, I want to determine the effects of grazing by animals...

• Replies: 4
• Views: 5,477
08-24-2011, 06:50 AM
5. ### year fixed effects in time series regression

I'm trying to estimate what effect the tariff rate in a specific country has on evasion of tariffs (or rather the underreporting of the value of...

• Replies: 0
• Views: 3,776
08-26-2011, 03:23 AM
6. ### Multiple Moderated Regression Help!

Hi folks, i need help regarding multiple moderated regresison analysis in SPSS. I have one independent variable (X), one Dependent variable (Y)...

• Replies: 3
• Views: 3,438
08-27-2011, 09:42 AM
7. ### (easy) Maximum Likelihood Regression question...

hello everyone. i am trying to get my head around a very easy example that i read somewhere explaining maximum likelihood estimation on the OLS...

• Replies: 11
• Views: 4,768
08-27-2011, 02:33 PM
8. ### Moderated multiple regression and mixed factorial ANOVA

I conducted a moderated multiple regression and a mixed factorial ANOVA on the same variables and got two different results (using moderated multiple...

• Replies: 5
• Views: 7,407
08-27-2011, 03:52 PM
9. ### How does correlation work?

Dear All, I am a beginner to statistics. I have a pretty basic question. If I have 2 variables X and Y, how does E produce a no which measures...

• Replies: 2
• Views: 4,333
08-28-2011, 11:03 PM
10. ### homework problem

I have to find a linear model that explains the variable "days to death" based on the other variables. I can't upload the data. If you want to help...

• Replies: 0
• Views: 1,541
08-29-2011, 05:48 AM
11. ### Trend data with categorical independent variables

I have 4 time points (future timepoints will be added shortly) measured for each company (about n=150). Each company is associated with one of 20...

• Replies: 0
• Views: 2,087
08-29-2011, 10:37 AM
12. ### Appropriate Coding of DV in logistic regression

Good morning! I have the following problem with a logistic regression that relates German graduates' attributes (subject, univerity type, degree,...

• Replies: 2
• Views: 3,536
08-30-2011, 02:43 AM
13. ### Panel Data Regression using Stata/SPSS

Please I need help. I am trying to run multiple regression analysis using SPSS and Stata but what am getting is not good at all. Can anybody help?...

• Replies: 0
• Views: 4,640
08-30-2011, 05:56 AM
14. ### Multiple regression analysis: Significant regression model, insignificant predictors

With regards to the title above, my multiple regression model has a significant F value but none of the predictors are significant. All the...

• Replies: 6
• Views: 12,826
08-30-2011, 04:51 PM
15. ### multiple sets of data fitted to one distribution

Hello everyone, I'm new to this board so I hope I'm putting this in the right section. I have multiple sets of data which fit the same...

• Replies: 1
• Views: 2,448
BGM
09-01-2011, 01:34 AM
16. ### Nonlinear regression of non normal asymetric data

Hi! I have a set of data that is dependent on 3 dependent variables. The data is collected over a time period tvice a day. I have a theoretical...

• Replies: 1
• Views: 2,575
09-01-2011, 01:35 PM
17. ### Which statistical test should I use?

I am struggling with my dissertation, as having collected my data, I am unsure of which test to use. I am investigating the differences in imagery...

• Replies: 4
• Views: 4,875
09-01-2011, 02:15 PM
18. ### Changes in the level of Significance

I use standard errors for significance. Basically there is no problem with the significance, the problem is how to interprete the results. The...

• Replies: 2
• Views: 2,478
dou
09-02-2011, 04:45 AM
19. ### Covariance of residual

I'm given the mutiple regression equation Y = XB + e I have to find the covariance between e_hat and Y First what I did was changed e_hat =...

• Replies: 0
• Views: 3,655
09-03-2011, 08:52 PM
20. ### Forward selection

As most of you probably know, forward selection is a method of model selection that involves introducing independent variables into your model one by...

• Replies: 1
• Views: 2,851
09-04-2011, 04:10 PM
21. ### Multinomial hierarchical logistic regression

Hi everyone! I am wondering if anyone could help me to understand multinomial logistic regression. I am trying to do similar hierarchical...

• Replies: 1
• Views: 2,968
09-05-2011, 05:42 AM
22. ### Lmer Output/: variable re-levelling

Morning/Evening all I'm having a bit of a time getting the LME4 package to list ALL of my IVs, rather than all-1. By way of example, here is my...

• Replies: 7
• Views: 6,115
09-06-2011, 06:56 AM
23. ### looking for a way to check possible mediation in regression

Hi all, My research includes child-parent talk, and I have four main variable types: 1-Child talk 2-Child perceptions 3-Parent talk 4-Parent...

• Replies: 0
• Views: 1,703
09-07-2011, 02:26 AM
24. ### Is it a sensible practice to collapse categories of a predictor?

I used logistic regression to run a model. An explanatory variable called 'region' has 3 levels (1, 2, 3). Level 3 is the reference group. The...

• Replies: 2
• Views: 3,337
09-07-2011, 10:07 AM
25. ### Logistic Regression and Multiple Regression

Hi, Please could you help me (or direct me to someone who can help me) with the following: I have a spreadsheet with a number of...

• Replies: 13
• Views: 3,865
09-07-2011, 10:17 AM
26. ### Missing time points in Cox Regression

Hi, I'm pretty new to the forum so please excuse if I bring up something old. I have searched for an answer but have not found anything about it. ...

• Replies: 2
• Views: 2,499
09-07-2011, 03:55 PM
27. ### Fit a non-recatngular parabola in R

Hello, I'd like to fit the formula below to a non-rectangular parabola in R. C = (XI+A-√((ϕI+A )^2-4XϕIA))/2X-R I have several data points...

• Replies: 0
• Views: 4,289
09-08-2011, 10:01 PM
28. ### Multivariate regression with non-linear effect on dependent variable

Hi all, I'm looking for an appropriate technique for a problem I'm trying to solve. I have a dependent variable that is count data - number of...

• Replies: 1
• Views: 1,486
09-09-2011, 03:14 PM
29. ### IQ/achievement test correlation (rxy)

Working on creating new regression tables for determining the presence of learning disabilities. In order to do this, I need to determine a...

• Replies: 1
• Views: 4,794
09-09-2011, 04:02 PM
30. ### 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: 2,512
09-11-2011, 08:14 PM
31. ### Regarding negative correlation and negative variance estimation result

In ANOVA, we sometimes talk about that variance estimation can get negative result when there is negative correlation. I do not understand what...

• Replies: 8
• Views: 5,268
09-12-2011, 11:32 PM
32. ### Group size analysis over time

Hi, I was wondering if anyone could help me please. I am looking at how group size changes with the amount of food available in a group of...

• Replies: 0
• Views: 1,955
09-13-2011, 08:21 AM
33. ### Software Application Regression

Hello here is my problem: I would like to perform a regression analysis to examine parts of my company's software application. I would like to...

• Replies: 0
• Views: 2,095
09-13-2011, 07:16 PM
34. ### Independence of irrelevant alternatives test

Hi, I'm looking for to test to see if my logistic regression model violates the independence of irrelevant alternatives assumption. The most often...

• Replies: 0
• Views: 3,282
09-15-2011, 10:47 AM
35. ### Panel Data Regression (xtreg) STATA

Hello everyone, I'm running a pooled tiem series regression with random effects. It runs fine and I'm having a problem interpreting results. I'm a...

• Replies: 0
• Views: 6,312
09-15-2011, 09:24 PM
36. ### Novice needs help with Maximum Likelihood Estimation of Logit Model

Hi all, I’d be grateful for some help. I realise this is perhaps elementary stuff for many but as someone without a formal statistics background, I...

• Replies: 3
• Views: 3,430
09-16-2011, 09:21 AM
37. ### Need help on a regression problem

Hi guys, I got a degree in statistics but I'm pretty rusty since I haven't touched it for over 5 years. Hope someone can help. :) Basically I have...

• Replies: 5
• Views: 1,924
09-16-2011, 01:21 PM
38. ### significant nonlinear curve

Hello, For linear regression we have R² that help as to know if x and y are correleted, and p-value if my correlation is significant. How can I...

• Replies: 1
• Views: 2,520
09-17-2011, 12:18 PM
39. ### Any software to get sample size/power analysis for probit regression?

Hi All, I need to figure out sample size for an upcoming study that will utilize a probit regression to test agreement of a new diagnostic test to...

• Replies: 12
• Views: 7,935
09-19-2011, 12:06 PM
40. ### My GRS statistic value is coming out to be weird.

I am calculating GRS F-statistic on excel. Howeve rthe value is coming out to be either veyr big in trillions or too small. I guess the problem...

• Replies: 0
• Views: 3,323
09-21-2011, 06:48 AM
41. ### linear regression through the origin

Hi, I have to find a linear model, I've tried a lot of models but all of them gave me R^2 adj= 0,4. The model without the intercept gave me R^2...

• Replies: 0
• Views: 1,669
09-21-2011, 07:16 AM
42. ### Simple guidance needed (regression & interaction terms) plz

Hi guys - I've been searching around online for a while and even have a textbook but I'm still confused and require guidance from someone. Running...

• Replies: 3
• Views: 2,357
09-21-2011, 12:37 PM
43. ### Multiple Linear Regression for Categorical and Continuous data Independent Variable

Dear all, I need to analyze the relationship of DV and IV. I have Dependent variable in continuous data. And i have around 22 independent...

• Replies: 2
• Views: 12,596
09-22-2011, 10:17 PM
44. ### Probably a dumb question...

I have been using R to code my analyses for my research projects, and unfortunately my statistics background is sparse and ancient; please pardon me....

• Replies: 1
• Views: 2,341
09-24-2011, 01:00 PM
45. ### Regression Line Help

I have an problem and I have a ton of numbers but I am not sure how they go into the questions.... Hours: 0, 1,1,2,3,3,5,5,5,6,6,7,7,9,10 Score:...

• Replies: 1
• Views: 2,631
BGM
09-26-2011, 04:17 AM
46. ### Assumptions that underlie a regresion model

Are there any statistical tests that i can use to evaluate whether the assumptions for the regression model are being met? The assumptions i want...

• Replies: 4
• Views: 3,121
09-26-2011, 11:52 AM
47. ### Autoregression w/ Point Process?

I would like to generate something akin to an ARX model of a quasi-sinusoidal continuous time series, but my exogenous variable is a binary (0-or-1)...

• Replies: 0
• Views: 1,606
09-27-2011, 09:00 PM
48. ### Different Time Intervals with Logistic Regression

Is it possible to use different time intervals with logistic regression? Let's say I was trying to predict a binary dependent variable (0,1) based...

• Replies: 1
• Views: 2,459
09-28-2011, 12:27 AM
49. ### Should the standard error (SE) of the best-fit coefficients be propagated?

Hi all, This is how I understand it. Please correct me if I’m wrong: When fitting models to experimental data the statistical software produces...

• Replies: 0
• Views: 2,117
09-28-2011, 07:06 AM
50. ### 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: 3,243
09-28-2011, 06:19 PM
51. ### Sum of squares proof

Hallo Im tring to prove that correct sum of cross products Sxy = Sum of (Xi)(Yi) - n XiYi given that Sxy = Sum of (Xi - Xbar)(Yi - Ybar). Can you...

• Replies: 4
• Views: 12,158
09-29-2011, 03:22 AM
52. ### Binomial GLMM, no variance in some groups

Hey! I have a dataset, but I'm having big problems with it. For my research, I basically do some learning trials, and afterwards test for...

• Replies: 0
• Views: 1,801
09-30-2011, 08:37 AM
53. ### why is the covariance of my residuals not 0?

hello there. i am trying to wrap my head around the assumption that, in regular OLS regression, the covariance of the residuals is 0. i worked out a...

• Replies: 11
• Views: 8,622
09-30-2011, 12:41 PM
54. ### The Connection between conditional expectation and unconditional expectation

William Greene, Econometric Analysis, 7th edition, 20th page: The zero conditional mean implies that the unconditional mean is also zero, since E...

• Replies: 3
• Views: 12,415
10-02-2011, 02:18 PM
55. ### Need Urgent help in Kruskal's relative importance

Hi, My client wanted us to perform Kruskal's relative importance technique on some of their modeling work. We have reviewed lot of literature and...

• Replies: 2
• Views: 6,550
10-04-2011, 11:01 AM
56. ### Moderation - help!

** Oops I meant to post this is the 'Psychology Statistics' forum. I've posted there, but cannot figure out how to delete this thread. Apologies for...

• Replies: 2
• Views: 2,227
10-06-2011, 06:19 AM
57. ### Stupid Q: Interpretation of slope in OLS

Hi ppl I'm running a bunch of regressions on a series of stock returns (decimal values). One of the models is: r_t = a0 + b1*rm_t + e ...

• Replies: 4
• Views: 2,967
10-07-2011, 12:02 PM
58. ### Regression analysis of Likert Scale

Hi all, I'm new to this site and conducting research in Physical therapy. I'm attempting to analyze data from surveys with likert scale...

• Replies: 1
• Views: 3,722
10-07-2011, 03:08 PM

Hi could could someone please help me understand this regression logic to find a conditional variance in a polynomial least squares regression ? X...

• Replies: 0
• Views: 1,914
10-07-2011, 05:26 PM
60. ### prediction using training data != training data

(Full disclosure: This is a cross-post from the Kernel Machines Forum) I'm using LIBSVM for regression analysis and, despite double checking my...

• Replies: 2
• Views: 2,641
10-09-2011, 11:29 PM

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