# All Questions

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### Best way to model this data, qfit or fpfit? How to get equation?

So I have this relationship, which is obviously not linear. The purpose is to see if there is (and what kind of) a relationship between FRAG (test score) and MD-R (mm^2/s). There are other covariates ...
31 views

### rpart classification: why is my predict() output not adhering to type=“class”?

I have a dataframe, 'datas', with 200 observations and a series of columns (some numeric, dummy, etc) and a binary class variable to be predicted that is called "bad_econ." I would like to get the ...
21 views

### Standard Error of estimate of variance

I am not understanding how is the standard error of estimates of two-factor factorial random effect model calculated ? For example , In the book Design and Analysis of Experiments , by Douglas C. ...
13 views

### Significant interactions force main effects to be insignificant and plus change their sign--how to interpret? [duplicate]

I've read through many similar posts regarding significant interaction wiping out the significance of main effects, but since there were no questions regarding changing signs I decided to post another ...
9 views

### Accessing the xpath for generlized mixed model using SPSS java plugin [on hold]

I am using SPSS(version 22) java plugin and run a generalized linear mixed model. I wan to get the output of the AIC from the generated output. I am not sure what is the xpath of for getting this ...
21 views

### Why no MAX models?

I'm diving into the field of system identification, black box modeling and forecasting. A lot still has to become clear to me, but one question that came to my mind (and to which the answer might ...
18 views

### what happens while taking correlation for correlation matrix

What does the correlation matrix of correlation matrix represent? Is it second order correlation? x = cor(z) y = cor(x) Does y second order correlation of z?
13 views

### What type of panel regression is this

For the following equation $$Y_{ct} = \alpha_c^D - \phi i_{ct} + \eta logx_{ct} + \epsilon_t^D + \epsilon_{ct}^D$$ where, for country c at time t, $$Y_{ct} \text{ is the log real GDP}\$$ ...
9 views

### Standard error clustering under treatment assignment in groups of varying size

Basic setup: Unit of observation is the individual. Treatment (binary) is assigned on city level. Every state contains 4 cities, 2 get randomly chosen for treatment, 2 control. There are only 5 ...
48 views

### Bootstrapping gives me significance, without it not so much

For instance, in the table below, a GLM (ANOVA) Tukey posthoc bootstrapped 1000 times gives me a confidence interval like this. The columns are mean difference, bias, standard error, and the bounds of ...
15 views

### R: MLE estimation of transition probability density (CIR)

I am trying to replicate the model Zhang and Zhu (http://onlinelibrary.wiley.com/doi/10.1002/fut.20209/epdf) used to get the parameters of a stochastic volatility model. Therefore, I determinded the ...
12 views

### Extracting regression coefficients [on hold]

Is there a way to extract the regression coefficients in order to plot them? Right now, we have a process where we run these in Matlab and then export the coefficients to Excel where we then chart the ...
13 views

### How to score the predictions of a classification model?

I have made a classification model using support vector machine for the classification of two classes.The model is giving probability score and decision value for the test and training set and also ...
8 views