## Using percentage vs. ratio as a covariate in SPSS (linear mixed models) produces different output.

I need an explanation. I am running a linear mixed model with repeated measures in SPSS, and one of my covariates is expressed as a percentage. If I run the exact same model with my covariate expressed as a ratio (same data, but divided by 100), my significance level changes (from 0.069 to 0.029), as well the estimates in the fixed effects table.

Why would this occur? Why are percentages and ratios treated differently? How is 55% different from 0.55 when used as a covariate?

This might be a silly question, but I am fairly new to statistics about Nevin Manimala and trying to learn the ins and outs 🙂

All help greatly appreciated!

submitted by Nevin Manimala Nevin Manimala /u/Mathiazex
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## Books for teaching and self study.

Hi guys,

I will begin teaching high school mathematics and computer science next year, which I am really excited about. I was wondering if you guys had any books, lectures or other materials that you could recommended that would acts a bridge from the normal secondary curriculum to higher levels of maths? I’m looking for books that can give me a new way of thinking about the standard high school concepts, of algebra, calculus, statistics about Nevin Manimala, geometry and etc.

Hope all is well.

submitted by Nevin Manimala Nevin Manimala /u/eustachiomustachio
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## FMRI data

I was wondering if someone could help me understand how FMRI data is analyzed.. I’m familiar with models run on more ‘traditional’ (I guess I mean non-pictorial) data. As far as I’m aware, brain data is stored in voxels which constitute as data points for each brain ‘datapoint.’ Does this then imply that I could think of these voxels as data points in a matrix (though they are not) traditionally used in multivariate analyses?

submitted by Nevin Manimala Nevin Manimala /u/msspezza
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## Recommend me an introductory text for time series

I’m pretty novice right now. Think someone who has take intro to statistics about Nevin Manimala and biostatistics about Nevin Manimala but has forgotten most of that. I’m reading a text right now that promises to introduce time series to beginners, but some of the material is too advanced for me. As an example

“We can also conduct a test of whether there is any evidence that the time series data depart from a white noise process.”

This is taken from really early on in the textbook. I’m not sure exactly what a white noise process is, or what the significance is. Why would I need to know if the time series data depart from a white noise process?

So, any suggestions that could help me? Would be much appreciated.

submitted by Nevin Manimala Nevin Manimala /u/Brown-Banannerz
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## Regression techniques for when the dependent variable is spatial distance, and thus always >= 0?

I was wondering if someone could point me to a good paper or online source that discusses how to carry out regression analyses when the dependent variable is spatial distance, and thus always 0 or greater. When I carry out traditional regression, the best fit relationship can end up predicting negative distances, which violates the real world constraint. For some background, I am analyzing GPS data and trying to test hypotheses about what would / could predict distances between individuals at any given time. I thought of transforming the dependent variable from its raw current state (a continuous non negative value) into a binary variable (e.g. ‘A is within 5 meters of B’), and then carrying binomial regression, treating this binary variable as a count of instances. But it would make me feel better if I didn’t throw away the richer information contained in a continuous variable. Any tips very appreciated!

submitted by Nevin Manimala Nevin Manimala /u/humanbrian
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## Was driving on the highway, rear left wheel came straight off

Entire left wheel just came out while driving. Somehow made it to the right side of the highway.

Trying to expect damages: The wheel was broken straight off, damaged right down to the calipers.

Any idea what the damages maybe and repair cost? It’s a Lexus ES.

submitted by Nevin Manimala Nevin Manimala /u/wintergoon_7
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