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Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

Dear All, I have a question here. when I put control my variable in my multiple regression in spss, why the result is the same as that of no...

• Replies: 2
• Views: 2,304
06-24-2011, 02:04 PM

Hi,please help me. I'm working on a thesis to determine the effect of independent variables(four independent variables, denoted by X1,X2,X3 and X4)...

• Replies: 0
• Views: 1,630
03-01-2015, 09:26 PM
3. Accuracy of prediction?

Right, I've got some data for variable X and variable Y in 2002. Using Simple Linear Regression, I've made a model which uses variable X to...

• Replies: 1
• Views: 1,564
03-20-2013, 05:51 PM
4. Adaptive Lasso and CrossValidation for SNV selection

Hello everyone, I have available 17 000 variables (SNV frequencies, a certain number of zeros) for 40 patients. Each patient is represented by its...

• Replies: 3
• Views: 2,733
12-13-2016, 11:51 AM
5. Addendum: Probit Model, Liklihood Ratio Significant, Very Low Pseudo R-Square

Multicollinearity does not appear to be a problem. None of the predictor variables has a VIF over 1.5.

• Replies: 2
• Views: 3,817
02-25-2011, 11:23 AM
6. Adding dummy variables let significance of coefficients disappear

Hi all I have a regression with two variables x1 and x2, both are significant. When I add a dummy variable D (which is significant), one of the...

• Replies: 3
• Views: 2,331
08-22-2014, 07:14 AM
7. Adding main effects when main effects model is insignificant

Hi, I have a linear model where both main effects are insignificant, and an overall insignificant model. Should I stop just stop there, or can I...

• Replies: 1
• Views: 925
11-05-2015, 07:31 PM
8. adding skewness and kurtosis to CAPM - regression

Suppose I have a set of monthly returns of a stock, monthly 'market' returns and some risk free rate for lets say 10 years. Performing an usually OLS...

• Replies: 1
• Views: 5,492
12-18-2015, 07:26 PM
9. Adding up the coefficients of a contemporaneous and a once-lagged variable

Hello, I'm stuck on what's probably a trivial problem, but I can't figure out how to go about it as I am a semi-beginner, so I would really...

• Replies: 0
• Views: 1,663
12-01-2012, 07:46 PM
10. Additive - Multiplicative and Non Linear Regression

Hello, Let us say that we have a dependent binary variable expressing the occurence and non occurence of an event. We also have a number of...

• Replies: 0
• Views: 2,422
10-21-2012, 12:20 PM

Currently, I'm trying to create a regression equation that can help my boss predict employee hours for the upcoming month. Basically, if we already...

• Replies: 3
• Views: 2,917
06-25-2010, 01:54 PM

AKA heteroskedacity Other than logging (when that works) and WLS, which I commonly lack the information or intelligence to use, what is the...

• Replies: 4
• Views: 1,151
02-04-2014, 01:36 PM

Hello! I have done a logistic regression to compare pregnancy rates amongst various ordinal categories of a specific blood hormone measurement....

• Replies: 4
• Views: 2,568
10-23-2013, 10:58 AM

Hi, I have a few questions. If I am doing linear regression with only one independent variable, is it ever viable to present an adjusted...

• Replies: 6
• Views: 2,504
09-19-2014, 09:55 PM
15. adjusting a proportion score (controling for age)

I have 20 yes/no ratings (did this product help you). People were able to rate as many of the 20 products as they used (on average people rated 5...

• Replies: 8
• Views: 4,355
12-15-2008, 11:23 PM
16. Adjusting for gender in total brain volume

Is there a way to adjust for the effect of gender on the outcome measure - brain volume without using it as just a co-variate. i.e. can I transform...

• Replies: 0
• Views: 1,917
09-18-2013, 05:45 PM
17. Adjusting survey data that is taken at diffrent timepoints

Hi all, I am trying to analyze the differences between two groups in the result of a psychometric survey after they have been affected by a...

• Replies: 2
• Views: 2,539
03-10-2009, 07:51 AM
18. advanced method to compare regression coefficient

Hello, I am regressing two butterfly richness variables (summer and winter) against a set of environmental variables separately. ...

• Replies: 5
• Views: 4,384
08-07-2010, 05:35 AM
19. Advice for random effects with interaction term?

I have a continuous dependent variable A and a continuous independent variable B. I measured these variables in 12 locations that can be separated...

• Replies: 1
• Views: 3,758
12-05-2011, 03:26 PM

hello, I have started my first journey to logistic regression, and i have already got my first problem. so, my SPSS merged file contains: -...

• Replies: 8
• Views: 1,369
10-11-2013, 04:51 PM

Hello Everyone, I’m writing a paper on the relationship between weather on daily public bike share system usage. I’m looking for a bit of advice...

• Replies: 0
• Views: 1,879
12-14-2016, 12:59 PM
22. Advice on Regression Model Using PROC GLM in SAS

Hi Everyone, thanks for your insight on this. I will try to explain my data set as well as possible. One of the models I am running on my data...

• Replies: 0
• Views: 1,062
02-21-2014, 08:39 PM
23. age groups vs continous

hello everyone, I am curious to know if there are any best practices when dealing with age variables for a logistic regression model. I currently...

• Replies: 5
• Views: 2,368
07-15-2014, 07:06 AM
24. Age-adjusted incidence rate ratios using Poisson regression

Hi All- I want to set up a SAS model for Poisson regression that will give me the age-adjusted incidence rate ratio for the incident cancer rate in...

• Replies: 0
• Views: 2,779
07-07-2014, 12:46 PM
25. Aggregating or Pooling Multinomial Logistic Regression Coefficients

I'm trying to recreate the MNL analysis like this paper or this one. In Excel I have a sheet with my choice column which contains the market share...

• Replies: 1
• Views: 1,619
10-31-2013, 05:35 PM
26. AIC backward selection - control variables

Hej! I have a question concerning AIC backwards selection. I am doing a Linear Mixed effect model where I have one main predictor and several...

• Replies: 2
• Views: 1,318
10-06-2015, 12:26 PM
27. AIC computation

(1) Compute the Akaike Information Criterion (AIC) value for the linear regression model Y = b0 + b1*X1 + b2*X2 + b3*X3. The regression model was...

• Replies: 0
• Views: 879
04-26-2017, 06:25 AM
28. AIC for evaluating transformations

I was just reading an article that seemed to say they used AIC to evaluate continuous variable transformations, I guess in a logistic model. I am...

• Replies: 1
• Views: 1,246
12-15-2015, 09:39 AM
29. AIC for models weighted

Have to choose the best fit between different model. model.list <- list (model1 = nls (y ~ (a * exp (b * x)), data = dat, weights = n, start = list...

• Replies: 0
• Views: 1,130
05-28-2013, 10:47 AM
30. AIC number of parameter

Dear all, I am new in this forum. I m facing a problem with my AIC. I m using model selection framework (Akaike’s weights) with various type...

• Replies: 0
• Views: 3,872
01-23-2011, 07:31 PM
31. Airline Stock Regression

Hi guys, I'm trying to run a regression with daily airline stock returns as dependent variable. I've included jet fuel price and the stock market...

• Replies: 0
• Views: 1,703
03-18-2013, 08:01 AM
32. Alcoolimetric Table

Any idea for estrapolation data for this table? I have read spec gravity= 0.8013 what will the content of Alcool? ...

• Replies: 0
• Views: 1,222
05-20-2016, 09:10 AM
33. 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: 3,199
03-02-2011, 01:31 PM
34. All for one, one for all categorical variable?

Hi everyone, I'm working on a classification model with logistic regression. Here are two independent variables we are looking at: id, sales,...

• Replies: 1
• Views: 1,259
11-12-2013, 08:23 AM
35. All my coefficients are statistically significant

Hi All, I am running a fixed effects model in stata, but all my independent variables are statistically significant. I am wondering if I am doing...

• Replies: 18
• Views: 5,652
10-03-2013, 06:21 PM
36. All possible sub-sets regression in SPSS

Hi there, I’d like to do an “all possible sub-sets” regression analysis in SPSS with six parameters to model my dependent vbl, but am not very savvy...

• Replies: 0
• Views: 2,873
07-06-2011, 01:43 PM
37. Alternative for a multi-level analysis

Hi all, For my criminology thesis I am analysing police interviews and would like to research the effect (the presence of) an attorney has on...

• Replies: 1
• Views: 1,501
08-25-2015, 10:13 AM
38. Alternative to Hausman test? Fixed-/Random-Effects with robust SEs

Hi everyone! After reading loads and loads of material about tests, I have still not been able to come up with a satisfying solution to my probem....

• Replies: 0
• Views: 3,558
06-29-2011, 10:59 AM
39. Alternatives to logistic regression when the number of cases is low

Hi All I got involved in my first foray into logistic regression, but have come to realize that I probably can't use it. Let me tell you about my...

• Replies: 4
• Views: 2,199
03-27-2013, 08:43 AM
40. Alternatives to Poisson regression for overdispersed count data

Hi all, I'm currently analyzing data from a series of behavioral experiments that all use the following measure. The participants in this...

• Replies: 6
• Views: 2,390
05-04-2012, 11:52 AM
41. AM I allowed to do this?

Basically i have a binary variable called DP ( takes values 0 or 1) that i had to drop from my multiple regression due to few observations with of...

• Replies: 1
• Views: 2,257
09-22-2008, 06:06 PM
42. 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: 2,767
10-31-2010, 07:51 AM
43. 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: 2,419
01-17-2012, 04:01 PM
44. Ambulance utilisation: help choosing a method

Hi, I need some advice in selecting a statistical test please. I am researching ambulance utilisation rates at a population level (defined by a...

• Replies: 8
• Views: 1,933
02-06-2015, 04:57 AM
45. An easy question about Generalized Linear Model

Hello everyone, I just started using GLM and was stuck by an easy question of GLM. If I already obtain the estimates of the parameters, let's...

• Replies: 4
• Views: 2,357
07-18-2011, 02:02 PM
46. An R question about GLM

I want to predict a set of proportions from a linear regression using glm in R. The model has a logit link but I want extract the variance-covariance...

• Replies: 0
• Views: 2,182
02-24-2011, 04:36 AM
47. Analyse a variable as continuous and as categorical

Hello everybody I performed a univariate analysis of a set of predictors. My plan was to include the significant predictors in a multivariate cox...

• Replies: 3
• Views: 1,903
11-21-2014, 08:14 AM
48. Analyses of count data for seedling survival: poisson or logistic regression?

Am I dealing with survival data (binary) or count data, and which is the best statistical analysis? I have counted seedlings surviving in each of...

• Replies: 8
• Views: 3,885
08-01-2012, 04:42 AM
49. Analysing a designed experiment - is the theory wrong?

hi, just had a scary thought . in all industrial DoEs we definitely have measurement error on the IVs. However I have always seen the OLS as the...

• Replies: 11
• Views: 1,359
07-18-2016, 11:07 AM
50. Analysing Panel Poisson Coefficients

Hi, I'm running a panel poisson regression with fixed effects in Stata. The result in Stata doesn't display a constant. Normally I use standard...

• Replies: 0
• Views: 1,556
06-14-2013, 10:05 AM
51. Analysis of a longitudinal study where interventions are received at different times

I have a data set of university students. The university has 8 different assisting programs, mostly like scholarships, for needy students to help...

• Replies: 2
• Views: 1,551
10-23-2014, 04:56 AM
52. 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: 3,183
12-13-2010, 06:31 AM
53. Analysis of model outputs

Hey there, I'm looking for some help/advice about a problem that I would like to tackle. I have a set of input-output (X-y) data. The aim of...

• Replies: 2
• Views: 2,250
08-19-2010, 12:41 PM
54. Analysis of multiple dependent variables of different sample sizes

Thanks in advance for your help, I'm not a statistician, so I'm struggling to understand the best way to analyse some biological data, and I...

• Replies: 0
• Views: 464
04-19-2017, 09:32 AM

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