Question
Answer the following about the common application of the R command acf() (“ACF”), for 10 points each.
[10m] The acf() function plots correlations described by this prefix at different lags in the sequence of input data. In machine learning, a lower-dimensional data representation may be produced by “variational” versions of encoders described by this prefix.
ANSWER: auto- [accept autocorrelation function; accept autocovariance function; accept autoencoder or variational autoencoder]
[10e] The acf() function is commonly applied to “series” named for this variable. Longitudinal data is taken for the same subjects at different values for this variable.
ANSWER: time [accept time series]
[10h] The autocorrelations that a time series’ ARIMA model produces can be tested for goodness of fit with a test named for Greta Ljung and this statistician. This statistician is credited with popularizing the phrase “all models are wrong, but some are useful.”
ANSWER: George Box [or George E. P. Box; accept Ljung-Box test; accept Box-Perkins test; reject David “Cox”]
<EK, Other Science>
Summary
| 2024 ARCADIA at UC Berkeley | 2024-12-06 | Y | 2 | 20.00 | 100% | 100% | 0% |
| 2024 ARCADIA at Waterloo | 2024-11-09 | Y | 1 | 30.00 | 100% | 100% | 100% |
| 2024 ARCADIA at GT | 2024-12-06 | Y | 4 | 7.50 | 75% | 0% | 0% |
| 2024 ARCADIA at Illinois | 2024-11-09 | Y | 1 | 20.00 | 100% | 100% | 0% |
| 2024 ARCADIA at Warwick | 2024-12-06 | Y | 5 | 12.00 | 80% | 20% | 20% |
Data
| Chicago A | Illinois Orange | 10 | 10 | 0 | 20 |