PERIOD COMPARISON

The tool can be used to compare compare scenarios or to compare periods.

PERIOD AND SCENARIO COMPARISON

An example of scenario comparison is Actuals vs Plan variance, while an example of period comparison is 2019 vs 2018.

The period you want to compare might be directly mapped in a column. In this case the column - a "Period" column in our parlance - might have two values - 2019 and 2018 you want to compare.

Alternatively, if you have a column in data format - "a Date" column in our parlance - you can choose the time aggregation the app must use to aggregate the periods you want to compare.

DATE AGGREGATION

If you supply the tool with a date column, the tool will allow you to:

• compare the calendar years (or quarter, months or weeks) against each other
• compare period-to-date values
• moving (or rolling if you prefer) analysis of previous 12 months

We use the IBCS notation for time series analysis:

• calendar comparison (by year, quarter, month or weeks) is notated normally, as you would expect. For example 2018Q3 vs 2018Q4.

• period-to-date comparisons are notated by prefixing an underscore to the time period name. For example _2018Q3 vs _2018Q4.

• moving average analysis is notated by prefixing a tilde to the period name. For example ~Year vs ~Year N-1.

Average values are notated with the Ø symbol

For calendar comparison set the widgets as below.

This will return a chart like so

For year to date comparisons set the widgets as below

This will return a chart like so

You can also compare with the equivalent quarter of the previous year.

The app with return this chart.

This chart with compare the most recent period (calculated from its start to the most recent available date) to the equivalent previous period. The value of the most recent date is shown under the "dataset info" expander.

For moving average comparisons set the widgets as below

The app will return this chart

If there is not enough data to go "backwards" by 24 months from the most recent date the app will return a warning...

...and fall back to a simple calendar year comparison.

You can choose the reference period you want to select for the comparison with the "most recent period" widget. If you choose "n" it will select the most recent period in the dataset as the "second" period in the variance analysis comparison.

If you choose "N-1"....

... it will choose the second most recent periods as the reference period and show the new end date of the reference period.

The chart total label and the variance values will naturally change.

COMPARING QUARTERS, MONTHS OR WEEKS

The tool can also compare quarters, months or weeks. If you select month and set "compare with year before" to True it will compare with the corresponding month of the year before. Otherwise it will compare with the preceding month.

All charts will plot the chosen date aggregation comparison.

INVERTING PERIOD ORDER

You can invert the order of the comparison, and set the most recent period as the "first" period in the comparison.

DATASET INFO

If you click on "dataset info" you will get short report with the periods found in the dataset.

The shown periods will changed depending on the date aggregation choice. Here we chose "quarter".

If you have multiple periods in your dataset - 2014, 2015, 2016 and 2017 - and you want to understand what happened across the whole timeframe, year after year the tool can help you in this analysis by letting you run the three different analyses - 2015 vs 2014, 2016 vs 2015 and 2017 vs 2016 - very easily. However, you will have to stitch the three results together by yourself, out of the system.