VARIABILITY MONTH PAGE

MONTHLY DATA VARIABILITY FOR  EACH YEAR

data are about:

  • expense
  • n° of purchases
  • n° of days of purchase

 

only past data are considered:

  • therefore, for the most recent year of expense, the most recent month of expense isn’t considered for the calculations, because it’s regarded as the current month

 

the red line in the center of the bar graph

it represents the average (for example the average monthly expense)

 

the length of the green bar

for example for expense, it represents, how much, on average, the actual monthly expense differs from the average monthly expense, as a percentage of the average monthly expense

  • the shorter the bar, the less variable, on average, the actual data in each month from the average (the less, on average, the monthly data changes from month to month)
  • if Var% is over 100%, the bar length doesn’t change

 

the data tell you, whether:

  • the overall monthly data is stable in each year
  • and therefore, whether the average monthly data is a good indicator of the actual monthly data
  • how the monthly data variability changed over the years

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for example, for 2017, on average, the expense in each month differs from the average monthly expense, by $535.15 or 128.73% of the average monthly expense (Avg: $415.73) (range: 0 – $950). In That case the average is useless,

only if Var% is very low, the average monthly expense (for example) is a good indicator of the actual monthly expense

if your spending habits don’t change over time and barring unexpected events that affect your spending, the average monthly expense (for example) is a good predictor of how much you’ll spend in the next few months

for example, you know your monthly expense is around $2000 and your spending habits are very stable:

  • you know how much you’ll need in the future months
  • you don’t keep $10,000 in cash every month, you can invest most of it

 

if you removed from consideration some sub category, for example to focus on your ordinary expense or on the less variable expense

  • you can see the variability of the ordinary expense or the more stable expense, by tapping the globe icon

 

  • data are re-calculated, without considering the sub categories removed from consideration (in this case the removed sub categories have expense in 2017 only)

 

  • you can tap and hold on the card, to see the names of the removed sub categories

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