DFT – Trigonometric representation
This issue focuses on using the DFT components to represent the input data set as the sum of the trigonometric sine-cosine functions.
September 23, 2013
Menu
Read through the articles below to stay up to date with NumXL Pro and topics related to time series, statistics, modeling, forecasting, and many more.
This issue focuses on using the DFT components to represent the input data set as the sum of the trigonometric sine-cosine functions.
In this entry, we examine the Discrete Fourier Transform (DFT) and its inverse, as well as data filtering using DFT outputs.
Spider Financial is excited to announce the new NumXL Affiliate and Agent Program!
We look forward to working with affiliate marketers to grow the NumXL community. We are even more excited to introduce the world of affiliate marketing to Spider Financial.
In this study, we examine the daily prices of the first four (4) contracts of WTI CL futures listed on NYMEX, compute the number of days to the delivery month for each contract, and carry out principal component analysis (PCA) in an attempt to uncover the core drivers behind the futures curve changes (i.e. level and general shape).
We are excited to announce a new change to our online order system: we have switched our payment processor to Fast Spring (Santa Barbara, CA USA).
Using Fast Spring’s simple yet secure shopping cart system, we are able to offer NumXL all over the world, in languages and currencies automatically localized to each customer, while fully complying with local tax laws and regulations. Furthermore, more payment methods (e.g. purchase order (PO)), etc.) are now available to you.
How does this affect our customers?
Fast Spring is now considered our vendor of record, so invoices are issued by Fast Spring and charges will appear on your bill as: FS* spiderfinancial.
Aside from that, Spider Financial stands behind each sale made on its behalf. We continue to provide an unconditional 30-day money back guarantee for all purchases, and to offer the same discount programs (e.g. student, non-profit/academic, or volume).
For more details, check out our online sales policy.
In this case, we examine the highway retail price ($/Gallon) for “No.2 Ultra Low Sulfur (0-15 ppm) Diesel” in the EIA nine (9) PADD regions and carry on principal component analysis in an attempt to find a minimal subset of the principal components that capture (or explains) the variation (spreads) in prices across different regions with a minimal loss of information.
© 2024 Spider Financial Corp | | Terms & Conditions | Disclaimer | Privacy Policy | Trademarks & Copyrights
