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# Forum: Regression Analysis

Linear regression, linear models, nonlinear regression

1. ### Combining variables prior to performing regression analysis

Hello to all. I am running a regression analysis to evaluate if the joint analysis of costs and benefits can explain medicinal plant selection better...

• Replies: 3
• Views: 1,636
05-08-2015, 05:01 PM
2. ### Regression Excel Output - Missing Values

Hey guys, I've attached a screen shot of the table we have to use for my stats final. This is what we had on the midterm earlier this semester...

• Replies: 0
• Views: 1,413
05-08-2015, 09:06 AM
3. ### Question creating a statistical Analysis for treatment validation with placebo cond.

Hi there, promising board of infinite knowledge, 1. Randomizing the Conditions This is what I want to do. One individual, two conditions. ...

• Replies: 0
• Views: 987
05-08-2015, 05:03 AM
4. ### One observation per factor level combination in regression

Hi... I was wondering if you can perform multiple linear regression with a mix of categorical and quantitative variables, if you only have one...

• Replies: 2
• Views: 1,321
05-07-2015, 09:46 PM
5. ### Linear Regression - Influence of experience on wage

Hello Talk-Stats-Members, i am new to the forum and already have a (in my eyes) complex theoretical problem that i hope you can help me with. I...

• Replies: 4
• Views: 1,844
05-06-2015, 03:30 PM
6. ### Interpreting PROCESS Output

Hi everyone, Does anyone know of any good resources to help interpret the process macro output, specifically for model 14? I have the book but it...

• Replies: 3
• Views: 3,569
05-06-2015, 10:11 AM
7. ### [SPSS - Logistic Regression] Resolve the linearity of logit assumption

I am running a logistic regression and my income variable violates the linearity of the logit assumption. It is not negatively effecting the...

• Replies: 3
• Views: 4,454
05-06-2015, 08:42 AM
8. ### RESET test Statistic

Below is my question - I've never done a RESET calculation before so just seeking some guidance on how to start. I believe I need to add a quadratic...

• Replies: 1
• Views: 1,344
05-05-2015, 10:13 PM
9. ### Normally/non-normally distributed data - initial significance testing

Hi all, I would be grateful if anyone can direct me please. I am looking to 1. look at predictors of my DV (when controlling for confounders)...

• Replies: 1
• Views: 1,024
05-04-2015, 04:39 PM
10. ### optimal sample size

I'm performing a regression analysis (OLS) and I have the luxury that my sample size is very high (5.000 observations) compared to the number of...

• Replies: 6
• Views: 1,531
05-04-2015, 11:25 AM
11. ### how to control foe age-wave1 when running a mixed model analysis

Hi guys, I am running a linear mixed model in SPSS. My research question is: Does a reward-related personality trait at baseline predict weight...

• Replies: 0
• Views: 1,074
05-01-2015, 06:57 PM
12. ### P-Values equal to zero

Hi, I am running simple OLS regressions on forward and spot price data and have been getting p-values equal to exactly 0 (i.e. not 0.0000000234) for...

• Replies: 1
• Views: 1,410
04-30-2015, 10:05 PM
13. ### How to separate categorical variables in modeling

Suppose I have a dataset as follows: Product Week Type Num times ad shown Purchases 1 2/2/13 young,old,hipster ...

• Replies: 0
• Views: 884
04-30-2015, 10:32 AM
14. ### Probit Regresion

Hi all. What does categ.(factors) and count data mean in probit regression? Categ.(factors) mean covariate or something like that?

• Replies: 2
• Views: 1,415
04-30-2015, 07:51 AM
15. ### How can you deal with categorical variables that aren't present in your training set?

Let's say I have the following linear regression: earnings = c0 + age * c1 + male * c2 where "male" is a categorical variable and "female" is...

• Replies: 1
• Views: 1,454
04-30-2015, 02:37 AM
16. ### Comparing two linear regression gradients?

Hi, I am completely new to linear regression so this may sound daft, but I'm wondering if its possible to test for a significant difference between...

• Replies: 6
• Views: 4,585
04-29-2015, 09:08 AM
17. ### Comparing Models

Today I was going to attempt to figure out and write some SAS code to compare nested linear models (variance explained). But I need some basics...

• Replies: 8
• Views: 1,976
04-28-2015, 01:31 PM
18. ### multilevel modelling: predicting random effects for new clusters

Hi: I have a query I'm hoping someone may be able to help with. I've chatted to a few people and looked at texts and the literature but haven't...

• Replies: 9
• Views: 2,799
04-28-2015, 11:13 AM
19. ### Interpret continuous variables in binary regression model

I have produced three binary regression models, each showing the odds ratios (ORs) for an outcome (attendance versus non-attendance) Each...

• Replies: 7
• Views: 1,481
jle
04-28-2015, 01:58 AM
20. ### Difference-in-Differences(Evaluate effect of a policy implemented gradually)

Hi I have to do a diff-in-diff estimator in order to evaluate the impact of the policy. The problem is that the policy is gradually implemented...

• Replies: 0
• Views: 1,062
04-25-2015, 07:15 PM
21. ### Problem with interpretation of regression coefficients

Hi, I have problem with interpretation of regression coefficients. My regression function is: y = a + b1*x + b2*x^2 How can I interpret b1...

• Replies: 5
• Views: 1,590
04-25-2015, 04:01 PM
22. ### Estimation with negative coefficients

Hi, I have probably an easy problem, however I'm not really sure how to do it: Basically, I would like to estimate a linear regression with OLS. So...

• Replies: 4
• Views: 1,202
04-25-2015, 09:57 AM
23. ### Stepwise Regression with solution limited to max # independent vars - Best approach?

I am using MiniTab for stepwise regression. I have 25 independent variables I want to run through the stepwise procedure. However, I want the...

• Replies: 0
• Views: 1,189
04-21-2015, 06:01 PM
24. ### Regression analysis for periodic data

I am working on a hedging model for commodity.I have past 36 months data of commodity market price and future contracts price. e.g. on 1st...

• Replies: 0
• Views: 1,230
04-21-2015, 01:29 AM
25. ### DEA Analysis

Hi, I'm currently looking for some materials on DEA Analysis. Do you guys have any e-books or good webpages on this topic? I seek a material...

• Replies: 5
• Views: 1,860
04-16-2015, 06:57 AM
26. ### MLM (binary) Odds Ratio Interpretation

In the following paper on MLM with a binary outcome: http://analytics.ncsu.edu/sesug/2014/SD-13.pdf It provides the following OR...

• Replies: 2
• Views: 1,611
04-15-2015, 01:08 PM
27. ### Problem - stationarity and relevance

Hi all, I am doing my Bachelor's thesis at the moment and I ran into a problem I was hoping you could help me out with. While running my data...

• Replies: 0
• Views: 856
04-15-2015, 05:12 AM
28. ### Averaging x and y before fitting regression model

Hi everyone:wave::wave::wave: I have faced problem in my research when i fit a regression model my question is can i make moving average for...

• Replies: 0
• Views: 1,382
04-14-2015, 02:34 PM
29. ### order determination sample size for autoregression

Hi I am new to autoregression. I want to determine the order of an autoregression given a sample of size S1. I plan to use ordinary least...

• Replies: 0
• Views: 1,524
04-13-2015, 12:44 PM
30. ### Data Normalization

I have a problem that is challenging to me about fitting coefficient parameter. Here is the problem data (simple example) ...

• Replies: 1
• Views: 1,505
04-10-2015, 01:43 PM
31. ### PROC Means for dummy variables in SAS

I have created a dummy variable in SAS, that in any given year takes the value 1 if both countries are members of the EMU and 0 otherwise in that...

• Replies: 2
• Views: 1,456
04-10-2015, 11:54 AM
32. ### Force a regression coefficient to be negative

I have a regression problem using variable X to predict Y. That is, Y = c + A*X + error. For the regression problem, we need that A must be...

• Replies: 4
• Views: 1,988
04-09-2015, 08:10 PM
33. ### Dummy variable for EMU countries

Hello everyone :-) I have a dataset for 22 countries with 12 variables, where this two are important for this assigment: country1 Three-letter...

• Replies: 0
• Views: 1,441
04-09-2015, 12:51 PM
34. ### Semivariogram and kriging

Hello All, I am having problem with semivariogram. Say, there is three points (1,4),(2,1),(3,3). The results at this points are 50, 40 ,25. I want...

• Replies: 0
• Views: 1,217
04-08-2015, 08:43 PM
35. ### SSE and b1 are independent? How can I prove that?

at simple linear regression, are b1 and SSE independent. but how can i prove that? :confused: my text book said 'SSE is independent of each of...

• Replies: 0
• Views: 1,255
04-08-2015, 03:41 AM
36. ### Cox/ Binomial Regression: How to reconcile Non-significant model with significant IVs

Hello I'm been performing some survival and regression analyses corresponding to an event of interest being death or a certain surgical procedure,...

• Replies: 2
• Views: 1,727
04-07-2015, 06:03 PM
37. ### Stepwise Regression Help

Hi, Statistics is not my strong suit and I could really use some help. I'm wondering if it is possible to do a stepwise regression with 9 IVs on...

• Replies: 0
• Views: 1,953
04-07-2015, 04:00 PM
38. ### Regression Analysis and Residual analysis from Minitab output

The questions are on Regression and Analysis and Residuals. I need some explaining oh how to find and answer these questions just from a minitab...

• Replies: 0
• Views: 1,519
04-07-2015, 10:57 AM
39. ### Regression help

I ran a regression of event sales (y) and advertising spending (x). I got the following results: Correlation: .055 R2: .003 N: 438 y = 1.28x +...

• Replies: 6
• Views: 1,823
04-07-2015, 10:16 AM
40. ### Regression analysis

Hi all. Could I use linear regression with not normal distributed variable?

• Replies: 6
• Views: 2,117
04-06-2015, 11:39 AM
41. ### Multiple variable regression(BUT only one coefficient to be estimated)

Dear, For our master thesis we need to regress the equation Pt-P(t-1)= S/2*(Qt-Q(t-1))+Beta*S/2*(Qt-1)+et or http://prntscr.com/6q81o8 It...

• Replies: 0
• Views: 1,117
04-06-2015, 06:11 AM
42. ### Validation for prognostic marker

Dear All, I am completely lost in the area of statistics. I have a dataset of 265 cancer patients with a novel protein marker as well as the known...

• Replies: 3
• Views: 1,705
04-05-2015, 12:24 PM
43. ### Regression

When performing regression analysis on excel with data that has been condensed, should you expand the data before creating the analysis table. For...

• Replies: 1
• Views: 1,739
04-05-2015, 06:53 AM
44. ### Need Help on this question about Ratio of two parameters

I need help on this question: Suppose we have two independent samples from one population: Global Sample(Xg,Yg) and Local Sample(Xl,Yl) And we...

• Replies: 0
• Views: 976
04-02-2015, 10:14 AM
45. ### How to find Significant difference in R2

Hi My study requires comparing the regression square got from accounting policy 1 and from accounting policy 2. Same set of samples are used in...

• Replies: 0
• Views: 1,557
04-02-2015, 02:23 AM
46. ### Fisher r to z transform / significance test for two different values of r^2

Short version: I have two values of r^2 from Pearson's correlation, one from a control group (.713) and one for an experimental (.527), and I would...

• Replies: 1
• Views: 2,231
04-01-2015, 08:10 AM
47. ### Does rate of change in proportion variable depend on ranked independent variable?

I am doing an analysis on the prevalence of a drug resistance mutation in a particular country and how prevalence changed over time. Samples were...

• Replies: 0
• Views: 823
03-31-2015, 07:38 PM
48. ### Interaction terms with non-signficant main effects

I am using a logit model to do the analysis on my dissertation data. 2 of the variables interact, so I have an interaction term. My question is 2...

• Replies: 2
• Views: 1,097
03-31-2015, 01:35 PM
49. ### Timeseries: Evaluating Var models

I have build some var models with different types of variables and now I want to try to evaluate them and see wich one is the best But when I look...

• Replies: 0
• Views: 942
03-30-2015, 01:10 PM
50. ### Logistic Regression model: a significant predicting variable with low sensitivity?

Hi fellow forum members! Thank you in advance for your time! I used binary logistics regression (SPSS) to determine the relationship between...

• Replies: 1
• Views: 1,987
03-30-2015, 03:38 AM

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