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Cross Validated : Recent Questions and Answers (Page 76)

Find answers to your questions about Cross Validated or help others by answering their Cross Validated questions.

How do you compare standard deviations?

For example, if I am a scientist evaluating 2 methods to determine blood glucose and I want to compare if one is more variable, I would take, say, 6 samples...

Asked on 12/10/2020 by yaynikkiprograms

2 answer

How to interpret the beta estimates of a generalized linear model with a square root power link?

I'm running a generalized linear model (GLM) in SAS with a gamma distribution (since my Y response variable is skewed to the right) and a specified square root power link...

Asked on 12/10/2020 by StatBoy_41

0 answer

Can k-fold CV help reduce sampling bias?

I am currently writing a thesis and have surveyed about 500 people and I am using it as input in a supervised model. Due to some time limitations there was...

Asked on 12/09/2020 by Aite97

0 answer

Why is the standard deviation of the average of averages smaller than the standard deviation of the total?

Say I want to estimate the test error. I can either get $N$ batch $B_i$ then take the average of their average error (so the R.V. is the...

Asked on 12/09/2020 by Pinocchio

0 answer

Calculating bias of ML estimate of AR(1) coefficient

I am trying to develop adjustment factors for maximum-likelihood estimates of the auto-regression coefficient in an AR(1) process. By simulation I have discovered that the estimates are positively biased but...

Asked on 12/09/2020 by Andrew Kirk

1 answer

Using residuals from linear regression for normality testing for ANOVA

For testing the assumption of normality of residuals for ANOVA, can the residuals from linear regression be used instead of the residuals from GLM?...

Asked on 12/09/2020 by S.Ramagokula krishnan

0 answer

How does scaled conjugate gradient work in neural network training? Comparison with gradient descent

I am very new and beginner in the machine learning world, and I would like to ask if someone could simply explain to me how does the scaled conjugate gradient...

Asked on 12/09/2020 by Johanna

0 answer

For B-spline what does $sum_{i=0,n}N_{i,k}(t)=1$ mean?

For B-spline what does $sum_{i=0,n}N_{i,k}(t)=1$ mean? I don't understand what this means cause $N_{i,k}(t)$ are basis functions so what does it mean for them to all sum up...

Asked on 12/09/2020

1 answer

Is it possible to detect overfitting automatically/programmatically after model creation?

The definition of overfitting is "the production of an analysis that corresponds too closely or exactly to a particular set of data, and may therefore fail to fit additional data...

Asked on 12/09/2020 by Ayberk Yavuz

0 answer

R lmer model: degree of freedom and chi square values are zero

I have built the following models:full <- lmer(DV~ A*B + (1|speaker), data, REML=FALSE)A <- lmer(DV~ A+ A:B + (1|speaker), data, REML=FALSE)B <- lmer(DV~ B+ A:B + (1|speaker), data, REML=FALSE)interaction...

Asked on 12/09/2020 by RoroMario

1 answer

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