Study Mathematics notes on Time Series for A-Level. Useful for revision, homework, and exam preparation in Zimbabwe.
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This is the A-Level Mathematics notes. It is a free notes for revision.
Solution.
$x$ | $y$ | rank $x$ | ranky | $|d|$ | $d^{2}$
1 | 0,5 | 1 | 1 | 0 | 0
2,5 | 1 | 2 | 2 | 0 | 0
6 | 3,5 | 5 | 5 | 0 | 0
7 | 6,5 | 7 | 7 | 0 | 0
4,5 | 3 | 4 | 4 | 0 | 0
3 | 2,5 | 3 | 3 | 0 | 0
6,5 | 5,5 | 6 | 6 | 0 | 0
\[
\begin{aligned}
\sum d^{2} | =0
r_{s} | =1-\frac{6 \sum d^{2}}{n\left(n^{2}-1\right)} | =1-\frac{6(0)}{7\left(7^{2}-1\right)} | =1
\end{aligned}
\]
there is perfect positive correlation.
Time series
1 It is a set of data recorded over unifarm time periods such as a year over months
- the analyss of time series involves-decomparing the data to establush a pottern
- If a pattern is shown to exist there is a bosw for predicting trends into the future
- the tong term movement of a varable is known as a trend