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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### difference between 2x2-table and binary logistic regression

Hello, I have to find out what is the (conceptual) difference between the tests. I don't really know what my means. I know they ARE different, but...

• Replies: 4
• Views: 3,386
01-27-2012, 01:54 PM
2. ### Reason for Higher Correlation weight Being Non-Significant

Hi everyone, I ran a multilevel model using proc mixed. I obtained the following results. I ran a single regression using two scales as...

• Replies: 0
• Views: 962
01-26-2012, 03:24 PM
3. ### Multi linear regression

Hello everyone, I am new here (and to stats in general). Anyway I am working on a project where I want to predict the value of an outcome and I...

• Replies: 7
• Views: 2,917
01-26-2012, 12:57 PM
4. ### multinomial logit, marginal effects all insignificant!

Dear users, I am estimating a multinomial logit model. Concerning my coefficients, I find some variables being significant. After estimating the...

• Replies: 1
• Views: 5,301
01-25-2012, 04:49 PM
5. ### Collinearity Among Categorical Variables in Regression

Does anyone have any knowledge and/or experience in how to measure collinearity between categorical variables that have more than 2 categories in the...

• Replies: 6
• Views: 34,716
01-25-2012, 03:52 PM
6. ### Converting Group Centroids into Original Measurement Units in DFA

I used SPSS to perform a discriminant function analysis on leg length which I am using to differentiate males and females in my sample. New measures...

• Replies: 2
• Views: 2,061
01-25-2012, 12:54 PM
7. ### non zero mean gaussian error in least squares

Dear all, I have the classic Least squares problem Ax=b, but with Gaussian noise at both A and b. I found out that total least squares can be...

• Replies: 0
• Views: 3,096
01-25-2012, 11:29 AM
8. ### IV probit and Ivreg

Hello, When I use ivreg in Stata and cluster standard errors my results show that the independent variable is significant. However, when I use...

• Replies: 0
• Views: 4,028
01-23-2012, 02:31 PM
9. ### Polynomial Regression interpretation

I have 2 questions that I need help interpreting: 1. Y = 47.31051 + 1.06914(X) - .01383(X^2) Because X is used twice (and one of them is a...

• Replies: 2
• Views: 13,375
01-23-2012, 12:16 PM
10. ### Report Interaction Term Coefficients, SE, t, p, as well as the interaction?

A bit of a basic question: I ran regression analyses to test moderating effects of gender and stress on anxiety. So, DV: Anxiety. IVs:...

• Replies: 4
• Views: 3,483
01-23-2012, 05:01 AM
11. ### Relationship between correlation matrix and R square

Hi there! I wonder if R-squared can be deemed a function of the correlation matrix (or the variance-covariance matrix)? The only ways to compute...

• Replies: 2
• Views: 7,009
01-22-2012, 09:54 AM
12. ### Logistic Regression: Testing for interaction effects with many covariates

Hello everyone! As topic states, I am running a logistic regression with quite a lot of independent variables (23). There are a lot more candidate...

• Replies: 3
• Views: 9,833
01-20-2012, 01:01 PM
13. ### Variance Extracted and Multicollinearity in Structural Equation Model

Hello, I am a new user here, and I am quite in need of help with regards to statistical problems. :) I really appreciate it if anyone can help me. ...

• Replies: 0
• Views: 6,150
01-20-2012, 12:56 PM
14. ### Post hoc in ANCOVA

I'm trying to conduct a post hoc test on the results of an ANCOVA: > model <- aov(Max~Weight*Diet) > summary(model) But when I run the Tukey...

• Replies: 5
• Views: 8,029
01-20-2012, 07:59 AM
15. ### Negative linear regression (time value)

hey all, I'm working on a basic program for calculating the time remaining as a battery of a device runs down from 100% (full) to 0% (empty). ...

• Replies: 1
• Views: 1,709
01-19-2012, 12:57 PM
16. ### How to prove E(SSE)=(n-2)singma^2 ???

I'd like to know to how to prove E(SSE)=(n-2)singma^2 (SSE=Syy-BetaHat1*Sxy) . Ive been workin' on it for many days but still cant figure it out....

• Replies: 4
• Views: 13,580
01-19-2012, 10:44 AM
17. ### Enter the product term of 2 variables in linear regression?

How can you enter the product term of 2 variables in linear regression? One is gender (categorical) and the other one is continous (Scored 1-200). ...

• Replies: 1
• Views: 2,330
01-19-2012, 04:15 AM

1. how do you conduct moderation analysis in SPSS when the moderator is a categorical variable (3 levels represented respectively by +1 (active...

• Replies: 2
• Views: 2,724
01-19-2012, 12:29 AM
19. ### Iv probit

Hi, Is there a procedure to estimate a probit model in SAS using instrumental variables, like the IVPROBIT in STATA? Thanks!

• Replies: 2
• Views: 3,970
01-18-2012, 11:26 PM
20. ### Logistic regression problem

Hi, I'm experiencing difficulties with understanding my results despite active googling, and i'd be really grateful, if someone could help me. ...

• Replies: 5
• Views: 4,015
01-18-2012, 11:01 PM
21. ### Assumptions of Linear Regression and Time Series

Greetings, I am kind of confused while reading topics of Linear Regression and Time Series. There are bunch of assumptions to infer proper...

• Replies: 1
• Views: 9,396
01-18-2012, 12:05 PM
22. ### Am i understanding Regression analysis? Theory question

Lets say, I have a list of all the hall of fame outfielders in MLB history. Along with data on, fielding ability, OBP, etc. Can I set up a...

• Replies: 1
• Views: 2,410
01-17-2012, 04:01 PM
23. ### IV results interpretation

Hello, I have an endougenous variable x and an instrument for it, variable z. The instrument is (significantly) negatively related to x. My...

• Replies: 0
• Views: 2,284
01-17-2012, 07:24 AM
24. ### stats var

The message you have entered is too short. Please lengthen your message to at least 10 characters.

• Replies: 1
• Views: 1,608
01-16-2012, 09:29 PM
25. ### 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: 3,229
01-16-2012, 07:36 PM
26. ### unable to make model Hessian positive definite - help!

Hello all, My first time posting here, and really hoping that someone can help me out! I have data from a repeated measures experiment in which...

• Replies: 0
• Views: 8,075
01-16-2012, 10:10 AM
27. ### How to Guard Against Negative Probabilities in Multilevel Proportional Odds Model?

In SAS, it provides a "bound statement" to prevent negative probabilities for multilevel proportional odds model. How can I guarantee postive...

• Replies: 0
• Views: 1,253
01-15-2012, 10:35 PM
28. ### 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: 3,239
01-15-2012, 07:05 AM
29. ### Logistic regression (medicine)

Dear all, I have patients N=104 group1 n=43 with mild form of disease A (A1) group2 n=61 with severe form of disease A (A2) every patient...

• Replies: 4
• Views: 1,643
01-15-2012, 05:02 AM
30. ### 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: 2,283
01-13-2012, 08:05 AM
31. ### GARCH errors

Hey, I wonder if you couldn't point me in the right direction on this. What I'm basically trying to do is replicate the method used in this paper:...

• Replies: 0
• Views: 1,466
01-13-2012, 03:21 AM
32. ### Standard error of coefficients for ols vs regression through the origin

Hi guys, Thought I'd throw this out there officially since I'm having some trouble. I'm under the current impression that if you set up a...

• Replies: 9
• Views: 4,445
01-12-2012, 08:05 PM
33. ### confidence intervals for linear regression

Hi, newbie here, so please forgive the bad terminology. I started with ten years of historical data. I used Excel to give me a linear trendline and...

• Replies: 3
• Views: 3,574
01-11-2012, 09:13 PM
34. ### potential heteroskedasticity & autocorrelation problem with pooled cross-section data

hello 1) my data: i have collected a few thousand property transactions over the last 15 years. for each transaction i have got the price and the...

• Replies: 2
• Views: 4,036
01-11-2012, 03:56 PM
35. ### Simple Question Seasonal Autoregressive Model

Hi, I hope I'm posting this in an appropriate place. It's not exactly linear regression. If you have a seasonal moving average model like...

• Replies: 10
• Views: 3,141
01-11-2012, 02:27 PM
36. ### ridge regression example

Data Display Row x1 x2 y 1 1 1 2 2 5 4 5 3 5 5 6 4 5 6 6 5 ...

• Replies: 4
• Views: 7,913
01-11-2012, 01:43 AM
37. ### [SOLVED] Logistic Regression - Confidence Intervals

Hi I'm running a logistig regression in SPSS 16.0 and have come across the following issue: when testing for different confidence intervals (95%,...

• Replies: 3
• Views: 2,073
01-10-2012, 12:27 PM
38. ### confidence intervals in logistic regression with clusters

Hi, this is probably a simple question but i hoped someone could explain it to me, I have carried out a logistic regression model assesing the...

• Replies: 0
• Views: 1,026
01-10-2012, 06:06 AM
39. ### (Li'l) theoretical question about correlations in regression...

hey y'all people!??! how're y'all doooin' huh? i hope everyone had the most awesomest holidays!!! heh. so... who else is feelin' the pinch this...

• Replies: 9
• Views: 3,115
01-09-2012, 02:44 AM
40. ### Fitting a model with Bernoulli/Binomially distributed data

I am used to fitting data to estimate parameters in a model f(x,A) where x is my data point and A is the parameter(s) to be determined. To achieve...

• Replies: 6
• Views: 2,702
01-08-2012, 02:44 PM
41. ### 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: 1,546
01-05-2012, 11:37 PM
42. ### Logistic regression (firm-level and country-level variables)

I am new to logistic regression and wonder how I can combine firm-level variables and country-level variables into the same regression. For the...

• Replies: 10
• Views: 2,882
01-02-2012, 10:45 PM
43. ### Polynomial regression...how to solve a complex quadratic equation

Hi, The regression in question is: y= 216.44 -109.37X + 25.969 X^2 - 1.7699 X^3 where y = strength of strand board and X = amount of glue used...

• Replies: 1
• Views: 4,738
01-02-2012, 01:30 PM
44. ### Proportional Odds Models Programming Problem Using S-Plus

For ordinal logistic regression (proportional odds model), I need to define the following: For subject i, let (yi1, ..., yic) be binary...

• Replies: 0
• Views: 1,317
01-02-2012, 02:04 AM
45. ### interpreting log transformed co-effients in linear regression?

Hello, I have 1 continuous dependent and 1 predictor variable that I've logarithmically transformed to normalise the data and their residuals for...

• Replies: 6
• Views: 3,729
12-31-2011, 12:03 PM
46. ### Using mixed-effects models

Hello, I have been asking a series of questions within this forum and have had wonderful advice given. However as my statistics knowledge is...

• Replies: 2
• Views: 1,834
12-30-2011, 04:44 PM
47. ### non-integers in poisson GLM

Great forums, thank you to everyone who contributes to them. My question is regarding non-integer values from some data I collected on parrots...

• Replies: 7
• Views: 15,121
12-30-2011, 01:11 PM
48. ### Recoding inverted variables

Alright guys, so I conducted a multiregression analysis using SPSS and got the following result: STFDEM = 0,685 - 0,116POLINTR + 0,074POLDCS +...

• Replies: 0
• Views: 1,565
12-26-2011, 06:25 PM
49. ### P-value in regression analysis

How much should a p-value in a regression model be for the related variable to be considered insignificant?

• Replies: 6
• Views: 13,583
12-25-2011, 02:33 PM

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