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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Interpretation of an outliers ....what do they really mean?

I wanted to identify outliers when one value was a time in service and another was total cost. The way I intepreted such points was that these were...

• Replies: 1
• Views: 1,067
04-08-2014, 06:48 PM
2. ### Getting values larger than 1 for a logit test?

I have run a logit test on a binary dependent variable "gambled?" against "Age" in STATA. I have the dependent variable coded as 0 for no and 1 for...

• Replies: 4
• Views: 1,334
04-08-2014, 02:02 PM
3. ### Regression

Variable Y is predicted with variables X1 and X2 in the following regression equation: Y = 4 + 2X1 – 3X2. a. Which value of Y do you predict for...

• Replies: 1
• Views: 1,085
04-08-2014, 08:13 AM
4. ### MLE or instrumental variables

I'm trying to estimate a model in which one of the explanatory variables is correlated with the error term. As I see it there are two alternatives,...

• Replies: 0
• Views: 1,006
04-06-2014, 05:10 AM
5. ### Conceptual question on linear regression and data fitting

Hi all, I've been grappling with this question posed during class but can't seem to grasp it due to my sadly inadequate understanding of linear...

• Replies: 1
• Views: 1,346
04-05-2014, 04:13 PM
6. ### Can i use regression analysis for this problem?

Hi So im doing a study and i want to see if there is a trend here What i got: I got data that depends on if a certain animal is using a area (low...

• Replies: 1
• Views: 1,237
04-04-2014, 07:55 PM
7. ### Unbalanced dependent sample and intercept correction

Hi, I’m running a logistic regression analysis in SPSS and wanted to ask about the sample values for the dependent variable (landslide presence)....

• Replies: 1
• Views: 2,073
04-04-2014, 07:44 AM
8. ### [SOLVED] model coefficients

I need a little help with the output of this model. Below is the output of a linear model of log river flow over time: ...

• Replies: 4
• Views: 1,499
04-03-2014, 10:27 PM
9. ### Difference multinomial logistich with ordinal dependent and ordinal regression

Hi :) I am looking at a very large dataset in which I want to do a regression analyses on an ordinal variable (scores on a test divided in 4...

• Replies: 0
• Views: 915
04-03-2014, 04:43 AM
10. ### Slope Analysis for three-way interaction terms in regression equation

Hi everyone, I am completely new to this forum so I hope my question is not repetitive. Working on my PhD dissertation I am trying analyze 3-way...

• Replies: 2
• Views: 1,705
04-02-2014, 05:39 PM
11. ### Least Angle when A* A is singular.

I want to use Least Angle to least-squares-ify an overdetermined \textbf{Ax=b} because I'd like to minimize ||\textbf{x}||_1. The problem is, my...

• Replies: 0
• Views: 1,182
04-01-2014, 05:18 PM
12. ### Clustered Robust SEs or Multilevel Modeling approach? HELP NEEDED :-)

Hello everyone, I would love to hear your quick reaction to a particular data structure my colleagues and I are working with because we keep...

• Replies: 7
• Views: 1,789
04-01-2014, 10:13 AM
13. ### Boosted regression versus OLS regression

Dear all I am working on estimating a linear model using boosting regression technique to estimate the parameters. This is a slightly different...

• Replies: 0
• Views: 2,444
04-01-2014, 03:32 AM
14. ### Regression with an Index as a dependent variable

Dear all, I need help with a regression. My dependent variable is an index (ranging from 0 to 1). My independent variables are a dummy and a...

• Replies: 2
• Views: 12,383
03-31-2014, 06:13 AM
15. ### logistic regression categorical predictors

Hello, I really need help in understanding this: I have a categorical predictor- let's say education with 5 levels. The spss output gives me...

• Replies: 0
• Views: 1,456
03-30-2014, 02:09 PM
16. ### Differences in different groups

Hey guys, I need help with a data set I am trying to do analysis on. I have 650 randomly chosen observations of bugs. I want to find out if there...

• Replies: 0
• Views: 1,467
03-30-2014, 02:04 PM
17. ### Linear Regression:Controlling for categorical independent variables, WITHOUT dummies?

Short version: Does including a categorical nominal-level independent variable WITHOUT dummies still work as a simple control for other independent...

• Replies: 7
• Views: 2,531
03-30-2014, 01:24 PM
18. ### 2-stage Heckman instrumental variable estimation

Hi Guys, I am working on my thesis. My main regression model is the following: (1) Y=x1*Payment+x2*Country+x3*Industry..... All independent...

• Replies: 0
• Views: 2,085
03-30-2014, 10:34 AM
19. ### Fixed effects estimation: how many dummy variables can be included in model

Dear community, For my Bachelor-Thesis I have to assess the link between a firm's connectedness and success. For this purpose I was given data...

• Replies: 1
• Views: 1,616
03-30-2014, 03:55 AM
20. ### categorical predictors with multiple categories in logistic regression

Hi, I have a predictor X with 6 classes (X1, X2, X3, X4, X5, X6) in a logistic regression model. The p value for the class of reference (X1) is...

• Replies: 1
• Views: 2,049
03-29-2014, 08:32 PM
21. ### Weight vs. days

Let's say I keep records for 10 days and now I want to use the straight least squares fit line to predict my weight in the next 10, or 100, days. ...

• Replies: 1
• Views: 1,281
03-29-2014, 05:54 PM
22. ### Help to determine possible endogeneity bias

Hi, I have a Panel of 40 groups and a model where the variables are measured as deviations from group averages. E.g. d.x_it = x_it - mean(x_it)....

• Replies: 1
• Views: 2,102
03-28-2014, 04:15 AM
23. ### Deviance

Just trying to understand generalised linear models, and got this from S+. I must have fallen asleep when the null and residual deviances were...

• Replies: 1
• Views: 1,569
03-27-2014, 03:50 PM
24. ### Converting nominal dependent to interval variables through use of dummy variables

Dear all, My research involves the independent interval variable of Socio-Economic Status (SES), the ordinal independent variable of self-efficacy...

• Replies: 5
• Views: 1,568
03-27-2014, 11:41 AM
25. ### Cutoff points in logistic regression

One of the articles I am reading now makes reccomendations for changing the cuttoff point used in predicting whether Y=1 or 0. My question is, since...

• Replies: 6
• Views: 13,260
03-27-2014, 08:17 AM
26. ### Linear Regression Help

I am currently running analysis of my data in SPSS, and I am at kind of loss of how to run the

• Replies: 5
• Views: 2,074
03-27-2014, 05:47 AM
27. ### Semipartial correlations for simple slopes

Hello! I'm in need of some help for calculating sr2 for simple slopes. Here is my situation: I'm using SPSS. I have three IVs: x1:...

• Replies: 0
• Views: 974
03-26-2014, 01:29 PM
28. ### How to improve regression fit, if I know that certain data points have an error

Dear all I am encountering a problem in my regression analysis with 1 independent and 1 dependent variable. In my plots, there are certain points...

• Replies: 1
• Views: 843
03-26-2014, 08:30 AM
29. ### number of variables for a model

I am now trying to build a cox model: h(t, beta) = h0(t)exp(X*beta) I have selected some variables from the data, and for a category variable, if...

• Replies: 8
• Views: 3,061
03-25-2014, 06:05 PM
30. ### Post-hoc MR study

Hey everyone. I offered to help a faculty member prepare a manuscript from some data that had previously been collected via survey. This is a...

• Replies: 1
• Views: 1,335
03-25-2014, 02:33 PM
31. ### Logistic Regression Collapsing Levels

When previously working with a data set, due to a low number of observations in some of my data cells I was advised to collapse two of my ordered...

• Replies: 1
• Views: 1,300
03-25-2014, 07:30 AM
32. ### Can I combine PCA terms with real variables?

Hello, I'm new to this forum. Hopefully I am doing this right! I am trying to do a multiple regression analysis on a data set that has about 250...

• Replies: 0
• Views: 1,513
03-24-2014, 04:47 PM
33. ### Logistic regression

Good afternoon, I write to you for 3 questions. Thanks for your help. When in a regression analysis the correct model is unknown before the...

• Replies: 6
• Views: 3,141
03-22-2014, 02:04 PM
34. ### How to select the training dataset

I have a dataset which contains dependent variance Y and several independent variances X1, ... , X10. Y has 5 possible values: A, B, C, D, E, a...

• Replies: 2
• Views: 1,707
03-22-2014, 02:48 AM
35. ### SPSS regression:Does this new variables add to the model fit?

PLEASE HELP ME THOSE QUESTIONS: SPSS output from a set of three regressions estimated using the auto data we explored in the tutorials. Use the...

• Replies: 1
• Views: 1,737
03-21-2014, 03:21 PM
36. ### Probability

I am looking at hypothetical scenarios in which I am taking the frequency of number of steals per transaction. If I am specifically trying to find...

• Replies: 0
• Views: 917
03-21-2014, 11:18 AM
37. ### Finding R^2 when you know the trend

I'm working on making NBA player projections for fantasy basketball. Right know I have my projections and I'm looking at the correlations for each...

• Replies: 0
• Views: 1,400
03-21-2014, 08:52 AM
38. ### Is the fixed effect model for regression correct

Hi all, we have a dataset that has final exam Total_score(of students) from 500 random Schools. Some schools have ICT lab other do not have it,...

• Replies: 0
• Views: 1,254
03-21-2014, 04:05 AM
39. ### Help with understanding methodology of WLS model

Hi everyone, I'm working on duplicating this paper http://static.googleusercontent.com/media/research.google.com/en/us/pubs/archive/38355.pdf but...

• Replies: 1
• Views: 1,772
03-20-2014, 05:04 PM
40. ### Normality of residuals in regression: is it mandatory?

Hi everyone, as I said in a previous post I'm new to this forum, but I have basic concepts of statistics (I mean, I'm not a stat guru but I can deal...

• Replies: 3
• Views: 1,529
03-19-2014, 10:48 AM
41. ### [SOLVED] Describe curve of growth model

I'm reading a paper now and want to describe the curves as seen here: Are the bottom 2 lines considered exponential decay. What would the...

• Replies: 8
• Views: 1,916
03-18-2014, 08:05 PM
42. ### IRR interpretation from log transformed data

I've created a negative binomial regression model in Stata (overdispersed count data). I initially divided my predictor variable into quartiles...

• Replies: 3
• Views: 2,795
03-18-2014, 09:44 AM
43. ### OLS regression with firm and time fixed effects panel model

pls delete

• Replies: 1
• Views: 1,609
03-17-2014, 03:20 PM
44. ### Interpreation of flat correlogram - ARMA model

I have been asked to build an ARMA model for some oil WTI spot prices. I have manipulate the data to make it stationary (taking log-returns), and...

• Replies: 1
• Views: 2,786
03-17-2014, 01:40 PM
45. ### Predicted probabilities from logistic regression

Hi, I have carried out logistic regression in STATA to adjust for several patient characteristic variables that are thought to affect my outcome....

• Replies: 4
• Views: 2,516
03-17-2014, 04:51 AM
46. ### Ranking Based On Point Differential Only

Good Morning, I am working on a model that ranks men's college basketball teams based on point differential. The model is an SQL/VBA model that...

• Replies: 0
• Views: 918
03-15-2014, 12:08 PM
47. ### Using Regression Analysis to Map requirement Request to developers

Pls i need help on how to use regression analysis to map requirement request to the software developers....Pls its urgent! anybody got an idea on how...

• Replies: 2
• Views: 1,538
03-14-2014, 09:03 AM
48. ### Interaction terms

Dear all, I would like to hear your thoughts/ideas/comments on this. Brambor et al. (2006) write the following on interaction terms: "The...

• Replies: 0
• Views: 1,529
lbv
03-13-2014, 08:24 AM
49. ### least trimmed squared regression-basic question

Hi..i want to use least trimmed squared (LTS) for regression. i've written the coding in R as follow: lts2_M1<-function(failure) { ...

• Replies: 0
• Views: 1,611
03-10-2014, 08:31 PM
50. ### Use of Intercept Term in OLS Regression

When is it appropriate to exclude the intercept term from a standard OLS regression? The dependent variable is Sales (of a particular product) and...

• Replies: 11
• Views: 17,904
03-10-2014, 03:19 PM
51. ### Probit correct test to use?

Hi all. I'm conducting a small survey and am trying to figure out if the test I'm using is correct. For example, one of the questions is "How...

• Replies: 0
• Views: 873
03-10-2014, 11:03 AM
52. ### Categorical dependent variables / ANOVA

Hi all! Newbie here. In my current work role, I'm thought of as an expert on stats. This is totally untrue - but it doesn't take much to be seen...

• Replies: 14
• Views: 2,893
03-10-2014, 09:27 AM
53. ### Cenetering: Not that hard (unless you don't fully get it)

I'm a hands on visual learner. So I read about: gran mean and group mean centering. I also read this seminal piece by Enders and Tofighi:...

• Replies: 2
• Views: 1,451
03-10-2014, 09:24 AM

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