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Formula to find change from specific weekday

  1. 11-08-2022, 03:52 AM #1
    Techsahyogi
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    Formula to find change from specific weekday

    Hi

    I need to find the change in prices from previous day for all other days but for Thursday, this difference should be from previous Thursday and if in case previous Thursday not available then previous availble day in previous week e.g. Wednesday of previous week.
    Thank you very much
    Saurabh
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  2. 11-08-2022, 04:04 AM #2
    AliGW
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    Re: Formula to find change from specific weekday

    Welcome to the forum.

    Please explain the result for the first Thursday - why is this different? Just trying to establish the logic.
    Ali

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  3. 11-08-2022, 04:08 AM #3
    Kaper
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    Re: Formula to find change from specific weekday

    In F4:
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    and copy down.
    You have not described what to do in a situation like in row 6 (Thursday, but no prevoius week data). This is why IFERROR had to be used. And just previous day difference calculated as in your sample output.
    If you willl keep
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    for first week, then formula could be easier (F8 and copy down):
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  4. 11-08-2022, 04:35 AM #4
    samba_ravi
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    Re: Formula to find change from specific weekday

    f4=E4-IFERROR(VLOOKUP(IF(WEEKDAY(B4)=5,B4-7,B4-1),B$3:E3,4),E3)
    try above, copy and paste toward down
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  5. 11-08-2022, 09:16 AM #5
    Techsahyogi
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    Smile Re: Formula to find change from specific weekday

    thank you very much Kaper and Samba_ravi. It is exactly what I was looking for.
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  6. 11-08-2022, 09:23 AM #6
    AliGW
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    Re: Formula to find change from specific weekday

    If that takes care of your original question, please choose Thread Tools from the menu link above and mark this thread as SOLVED.

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  7. 11-08-2022, 09:40 AM #7
    Techsahyogi
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    Re: Formula to find change from specific weekday

    If the data of previous week is not available then in that case difference on Thursday can't be calculated, so it's fine to take the same logic as other days for the first Thursday only. I hope I am able to clarify. Thank you
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  8. 11-08-2022, 10:20 AM #8
    josephteh
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    Re: Formula to find change from specific weekday

    Another option, =E4-IF(WEEKDAY(B4,2)=4,XLOOKUP(B4-7,B$3:B3,E$3:E3,,-1),E3).
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