Converting Aggregated data to Daily

[Anonymous]

I am doing some analysis on Covid 19 cases .  The problem is my data set does not show new cases each day but the  total cases accumulated to date.  To Identify the incremental increase in cases each day I created the meausure below . The measure works in some rows but  in certain rows it does not work.  for example the increase was not calculated as shown in the table below when cases increased from 59 - 60 or from 60 - 61 and there are many other instances when this occurs. Any one have thoughts on what is taking place here?

Today Cases =

MAX('Daily Covid -19 Tracker'[Sum of total_cases]) -

CALCULATE(MAX('Daily Covid -19 Tracker'[Sum of total_cases]), FILTER(ALL('Daily Covid -19 Tracker'), 'Daily Covid -19 Tracker'[date] = MAX('Daily Covid -19 Tracker'[date]) -1) )

[parry2k · Accepted solution]

@Anonymous try changing MAX to SUM, maybe there are two transactions on the same day

Today Cases =
SUM('Daily Covid -19 Tracker'[Sum of total_cases]) -
CALCULATE(SUM('Daily Covid -19 Tracker'[Sum of total_cases]), FILTER(ALL('Daily Covid -19 Tracker'), 'Daily Covid -19 Tracker'[date] = MAX('Daily Covid -19 Tracker'[date]) -1) )

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[az38]

@Anonymous 

why don't you use solution from here https://community.powerbi.com/t5/Desktop/Converting-daily-aggregated-COVID-data-to-an-accurate-Monthly/m-p/1130871#M515300 ?

the problem your data is more complicated, you have many different columns, use

Today Cases =
CALCULATE(SUM('Daily Covid -19 Tracker'[Sum of total_cases]), ALLEXCEPT('Daily Covid -19 Tracker', 'Daily Covid -19 Tracker'[Date]) ) -
CALCULATE(SUM('Daily Covid -19 Tracker'[Sum of total_cases]), FILTER(ALL('Daily Covid -19 Tracker'), 'Daily Covid -19 Tracker'[Date] = MAX('Daily Covid -19 Tracker'[Date]) -1) )

[Anonymous]

@az38  I used a different data source. and although your original post helped me with my original data set it responsed differently to the new data. Thank you for your help