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fog37's latest activity
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fog37
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Time Series Models vs Models Used for Cross-sectional Data
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Yes, I am considering either a dataset where the time column contain time values that are separated by equal amounts (ex: day 1, day 2...
Apr 14, 2024
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fog37
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FactChecker's post
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Time Series Models vs Models Used for Cross-sectional Data
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Do you mean that the time-step varies significantly by unknown amounts from row to row or that it is a constant, unknown time step? I...
Apr 14, 2024
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fog37
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Time Series Models vs Models Used for Cross-sectional Data
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Thank you. Just to be clear, if we have a dataset with only two columns, hence two variables like Height ##H## and weight ##W##, we...
Apr 14, 2024
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fog37
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FactChecker's post
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Time Series Models vs Models Used for Cross-sectional Data
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I think this statement is too strong. Just because a statistical analysis does not automatically consider the time sequence of different...
Apr 14, 2024
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fog37
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FactChecker's post
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Time Series Models vs Models Used for Cross-sectional Data
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Are you talking about the first difference, rather than the value? Traders make profits when the stock price rises or falls. I can see...
Apr 14, 2024
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fog37
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BWV's post
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Time Series Models vs Models Used for Cross-sectional Data
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If traders can abnormally profit from asset prices with autocorrelation then autocorrelation will cease to exist. You can’t trade GDP...
Apr 14, 2024
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fog37
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Time Series Models vs Models Used for Cross-sectional Data
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The goal of multivariate time series analysis appears to be the creation of a model that is able to predict the value of the chosen...
Apr 13, 2024
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fog37
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pbuk's post
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Time Series Models vs Models Used for Cross-sectional Data
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A model which is linearly dependent on time.
Apr 13, 2024
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fog37
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Time Series Models vs Models Used for Cross-sectional Data
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Set Theory, Logic, Probability, Statistics
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Hello, I understand that a dataset that involves time ##T## as a variable and other variables ##Variable1##, ##Variable2##...
Apr 10, 2024
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fog37
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Wavelet transform (CWT and DWT)
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Thank you! And what is your intuition about the filters corresponding to scaled and shifted mother wavelets? How do you factor in the...
Apr 10, 2024
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fog37
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osilmag's post
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Wavelet transform (CWT and DWT)
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I guess I would say that once you have down or up sampled the signal, you have moved on to a different wavelet, with different a and t...
Apr 10, 2024
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fog37
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renormalize's post
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Non orthogonal basis and the lines of its coordinate grid
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Two Euclidean vectors are orthogonal if and only if their dot product vanishes; i.e., the angle between them is ##\pi /2##. There is a...
Apr 8, 2024
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fog37
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Non orthogonal basis and the lines of its coordinate grid
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Ha! Thank you. I checked the wikipedia page out but it is a little too sophisticated for me....Would you be able to provide some...
Apr 7, 2024
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fog37
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Non orthogonal basis and the lines of its coordinate grid
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Don't abandon that impression! The scalar (dot) product ##s## of two vectors ##\mathbf{a},\mathbf{b}## in a Euclidean space of...
Apr 7, 2024
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fog37
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Non orthogonal basis and the lines of its coordinate grid
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Yes, I was under the wrong impression that the dot product, regardless of the coordinates of the vectors changing under different bases...
Apr 7, 2024
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