The YRDIF Function PDF Since age is the difference

La formule DATEDIF vous permet de calculer le nombre de jours de mois

Using Date and Date/Time in Formulas

Feb 24 2022 between two dates or times. If you subtract one date from another

Calculated Fields – REDCap How-To Guide

Apr 2 2017 Calculations in REDCap are formatted the same way as Excel

Working with Dates & Times in Excel

Jan 1 2000 Date Exercise 2: Difference Between Dates. Simple Subtraction: Answer Expressed in Days. Date Delivered - Purchase Date.

Using Date and Date/Time in Formulas

Jul 19 2022 between two dates or times. If you subtract one date from another

The YRDIF Function

Since age is the difference in years between two dates (a birth date and some return the difference between two dates in the way that most people would.

REDCap Tutorial: Date Difference Calculation (datediff)

Using datediff function in a REDCap calculated field the interval between two entered dates can be calculated. It is useful to calculate the participant's

An Updated Users Guide to SOFR The Alternative Reference Rates

Feb 26 2021 wait for the term rates in order to transition.2 The LIBOR transition will be ... Figure 3: Difference between Compound and Simple SOFR.

Datetime values from other software — Date and time conversion

and import excel will properly convert those dates to Stata dates. 2. If you import the date variable as a numeric variable with values representing ...

[PDF] Calculer le nombre de jours entre deux dates avec Excel (formule

22 jan 2014 · La formule DATEDIF vous permet de calculer le nombre de jours de mois voire d'années entre 2 dates Notez que vos 2 dates doivent être au

Calculer la différence entre deux dates - Microsoft Support

Utilisez la fonction DATEDIF lorsque vous souhaitez calculer la différence entre deux dates Commencez par placer une date de début dans une cellule et une

Trouver la différence entre deux dates - Excel - PC Astuces

Dans Excel vous souhaitez afficher le nombre de jours de mois et d'années entre deux dates Vous pouvez utiliser pour cela la fonction DATEDIF

DATEDIF() : Calculer la différence entre deux dates - mDF XLpages

26 juil 2009 · La fonction DATEDIF permet de calculer la différence entre deux dates en années mois et jours Cette fonction n' est pas documentée dans l'

Calculer des dates avec Excel : astuces pratiques - Walter Learning

La fonction DATEDIF permet de calculer les différences entre les dates Elle est très peu utilisée et pourtant elle s'avère utile pour connaître le temps exact

Différence entre 2 dates – DATEDIF - Excel Exercice

La fonction DATEDIF permet d'effectuer une différence entre 2 dates et de renvoyer un résultat aussi bien en jours en mois qu'en années

Turoriel la différence entre deux dates sous Excel - Clicours

Dans Excel vous souhaitez afficher le nombre de jours de mois et d'années entre deux dates Vous pouvez utiliser pour cela la fonction DATEDIF

Calculer la différence entre deux dates en jours semaines mois et

8 nov 2022 · Cet article je vais parler de la façon de résoudre cette tâche dans Excel Calculez la différence entre deux dates données en jours

calculer lÂGE ACTUEL et lâge à une date précise - Excel-Malincom

29 nov 2022 · Et cela grâce à la fonction Excel DATEDIF Pour rappel la fonction DATEDIF calcule la différence de durée entre deux dates – en jours en mois

Comment faire la différence entre 2 dates sur Excel ?
Calculer la différence en jours
Sélectionnez la cellule D2, qui est la première cellule vide de la colonne Durée. Tapez =C2-B2, et appuyez sur RETOUR. Excel affiche le résultat en tant que nombre de jours entre deux dates (104). Sélectionnez la cellule D2.
Comment faire une différence entre deux dates ?
pour calculer l'écart ou la différence entre deux dates en terme de nombre de mois, on peut utiliser le même type de soustraction, en divisant le résultat par 30,5, qui est le nombre moyen de jours par mois : ECART = (DATE FINALE – DATE INITIALE) / 30,5.
Comment soustraire deux dates ?
Soustraire deux dates pour obtenir une durée
Maintenant pour calculer la différence entre ces dates, rien de plus simple. Dans une nouvelle cellule, effectuez la soustraction suivante : date la plus récente moins date la plus ancienne. Le résultat apparaît en nombre de jours, ici 109.
Modifier le système de dates dans Excel
Le système de dates change automatiquement lorsque vous ouvrez un document à partir d'une autre plateforme. Par exemple, si vous travaillez dans Excel et que vous ouvrez un document créé dans Excel pour Mac, la case à cocher Date System 1904 est automatiquement cocher.

Computing Ages in SAS®

Removal of the YRDIF Function from The Little SAS® Book: A Primer, Fourth Edition by

Lora D. Delwiche and Susan J. Slaughter

Because of problems when calculating ages, the YRDIF function has been removed from The Little SAS® Book: A

Primer, Fourth Edition, starting with the third printing. These problems are small, but nonetheless cause ages

computed using YRDIF to be inaccurate in specific situations. This paper explains why the problems occur, and then

discusses alternate methods for computing ages. Computing ages with YRDIF The SAS Help and Documentation states that the YRDIF function "Returns the difference in years between two dates."

Since age is the difference in years between two dates (a birth date and some other date), the YRDIF function has

been used to compute ages in this way: age = INT(YRDIF(birth-date, ending-date,'ACTUAL'));

In this implementation, YRDIF first determines the actual number of days between two dates. It then divides the

number of days from years with 365 days by 365, and divides the number of days from years with 366 days by 366.

In practice, this method does not always return the difference between two dates in the way that most people would

expect. When you calculate you expect the value of age to increment by one year on each birthday.

Dividing by 366 causes YRDIF to come up short in some situations. As a result, ages computed using the YRDIF

function may be incorrect if the starting or ending date falls in a leap year, and the ending date is the person's

birthday.

Please note that in this paper age is defined as the difference in years between a birth date and some later date. This

paper does not address the question of differences between a birth date and an earlier date. The methods discussed

here may produce unexpected results for negative differences in time.

Example This program illustrates the problem. Each line of data includes two dates. The first is the person's date

of birth. The second is either the date of that person's first birthday, or the date before or after that person's first

birthday. Only three birth dates (March 2, 2007, March 2, 2008, and March 2, 2009) are included. /*A simple example to demonstrate behavior of the YRDIF function*/ /*Compute age on day before first birthday, on birthday, and on day after*/

DATA testyrdif;

INPUT (BirthDate TestDate) (DATE11. +1);

AgeDecimalYRDIF = YRDIF(BirthDate, TestDate,'ACTUAL'); AgeIntegerYRDIF = INT(YRDIF(BirthDate, TestDate,'ACTUAL'));

FORMAT BirthDate TestDate DATE11.;

DATALINES;

02-MAR-2007 01-MAR-2008

02-MAR-2007 02-MAR-2008

02-MAR-2007 03-MAR-2008

02-MAR-2008 01-MAR-2009

02-MAR-2008 02-MAR-2009

02-MAR-2008 03-MAR-2009

02-MAR-2009 01-MAR-2010

02-MAR-2009 02-MAR-2010

02-MAR-2009 03-MAR-2010

Computing Ages in SAS 2

PROC PRINT DATA = testyrdif;

TITLE 'Results for YRDIF Function';

RUN;

This program uses the YRDIF function to compute the difference in decimal years between the two dates

(AgeDecimalYRDIF). Then the INT function is added to keep only the integer portion of the YRDIF result

(AgeIntegerYRDIF).

Here is the output:

Results for YRDIF Function 1

Age Age

Decimal Integer

Obs BirthDate TestDate YRDIF YRDIF

1 02-MAR-2007 01-MAR-2008 0.99955 0

2 02-MAR-2007 02-MAR-2008 1.00228 1

3 02-MAR-2007 03-MAR-2008 1.00502 1

4 02-MAR-2008 01-MAR-2009 0.99498 0

5 02-MAR-2008 02-MAR-2009 0.99772 0

6 02-MAR-2008 03-MAR-2009 1.00046 1

7 02-MAR-2009 01-MAR-2010 0.99726 0

8 02-MAR-2009 02-MAR-2010 1.00000 1

9 02-MAR-2009 03-MAR-2010 1.00274 1

The results for the calculations on each You can see that the integer

value from YRDIF gives the child born in 2008, a leap year, an age of 0 on his first birthday while the children born

in 2007 and 2009 have the correct ages. The YRDIF function works this way because it uses rules from the

Securities Industry to compute the difference between two dates. The problem is that these rules don't always match

the rules used to compute a person's age. The following two SAS Notes document this problem. http://support.sas.com/kb/3/036.html http://support.sas.com/kb/36/977.html

Alternate methods for computing ages People who want to compute ages have a choice of possible solutions.

Which method you use depends on how precise your results need to be, and on whether you need age in decimal or

integer values. Using YFDIF may be an acceptable solution if you do not need precise ages. Another solution that

produces approximate results is simply to divide the difference between the two dates by 365.25: age = INT((ending-date ± birth-date) / 365.25); To compute precise integer ages, this method is recommended: age = INT(INTCK('MONTH', birth-date, ending-date)/12);

IF MONTH(birth-date) = MONTH(ending-date)

THEN age = age -(DAY(birth-date)>DAY(ending-date));

This method uses the rather complex and versatile INTCK function. In this implementation, INTCK counts the

number of times the first day of a month appears between the two dates. Dividing this number by 12 gives a rough

value in years. Then the method checks to see if the starting month and ending month are the same. If they are the

same, then it checks to see if the ending day of the month is before or after the starting day of the month. If the

starting day of the month is greater than the ending day, then the age will be reduced by one.

Computing Ages in SAS 3

The INTCK method computes accurate integer values of age. However, because it counts the number of months

(thereby lumping together everyone born in a particular month), the decimal values produced by INTCK are not

meaningful. If you need decimal values for ages, you cannot use INTCK.

To compute decimal values for age, use the YRDIF or 365.25 methods and remove the INT function so that age is

no longer converted to an integer. The YRDIF and 365.25 methods give similar results for decimal ages, but YRDIF

is more accurate. The small differences result from the fact that YRDIF will factor in leap years only if leap years

fall between the starting and ending dates. Dividing by 365.25, on the other hand, always factors in leap years even

when no leap years fall between the dates.

To compute current age (age at the time your SAS program runs), you simply find the difference between the

current date and the birth date. The TODAY function returns the current date as a SAS date value. So to compute

current age, you would insert the TODAY function in place of the ending date for any of these methods.

It is possible to use PROC FCMP to create a user-defined function for computing ages. The code for that can be

found on SAS Institute's customer support web site. http://support.sas.com/kb/36/788.html

Example This program computes age using each of these methods (YRDIF, dividing by 365.25, and INTCK) so

that the results can be compared. For the YRDIF and 365.25 methods, age is computed both as a decimal and an

integer value. For the INTCK method, age is computed only as an integer. /*Comparing different ways of computing age*/

DATA testyrdif;

INPUT (BirthDate TestDate) (DATE11. +1);

*Decimal and integer ages using YRDIF; AgeDecimalYRDIF = YRDIF(BirthDate, TestDate,'ACTUAL'); AgeIntegerYRDIF = INT(YRDIF(BirthDate, TestDate,'ACTUAL')); *Decimal and integer ages using 365.25; AgeDecimal_365_25 = (TestDate - BirthDate) / 365.25; AgeInteger_365_25 = INT((TestDate - BirthDate) / 365.25); *Integer ages using INTCK; AgeIntegerINTCK = INT(INTCK('MONTH',BirthDate,TestDate)/12);

IF MONTH(BirthDate) = MONTH(TestDate)

THEN AgeIntegerINTCK = AgeIntegerINTCK-(DAY(BirthDate)>DAY(TestDate));

FORMAT BirthDate TestDate DATE11.;

DATALINES;

02-MAR-2007 01-MAR-2008

02-MAR-2007 02-MAR-2008

02-MAR-2007 03-MAR-2008

02-MAR-2008 01-MAR-2009

02-MAR-2008 02-MAR-2009

02-MAR-2008 03-MAR-2009

02-MAR-2009 01-MAR-2010

02-MAR-2009 02-MAR-2010

02-MAR-2009 03-MAR-2010

PROC PRINT DATA = testyrdif;

VAR BirthDate TestDate AgeDecimal: AgeInteger:;

TITLE 'Comparison of Methods for Computing Age';

RUN;

Computing Ages in SAS 4

Here is the output:

Comparison of Methods for Computing Age 2

Age Age Age Age Age

Decimal Decimal_ Integer Integer_ Integer Obs BirthDate TestDate YRDIF 365_25 YRDIF 365_25 INTCK

1 02-MAR-2007 01-MAR-2008 0.99955 0.99932 0 0 0

2 02-MAR-2007 02-MAR-2008 1.00228 1.00205 1 1 1

3 02-MAR-2007 03-MAR-2008 1.00502 1.00479 1 1 1

4 02-MAR-2008 01-MAR-2009 0.99498 0.99658 0 0 0

5 02-MAR-2008 02-MAR-2009 0.99772 0.99932 0 0 1

6 02-MAR-2008 03-MAR-2009 1.00046 1.00205 1 1 1

7 02-MAR-2009 01-MAR-2010 0.99726 0.99658 0 0 0

8 02-MAR-2009 02-MAR-2010 1.00000 0.99932 1 0 1

9 02-MAR-2009 03-MAR-2010 1.00274 1.00205 1 1 1

For the dates in this example, only the INTCK method produces the correct integer value of age on the birthday for

all birth dates. The YRDIF and dividing by 365.25 methods for computing decimal ages produce different answers,

but the differences are very small.

Conclusions This paper presents a brief overview of the major methods for computing ages. For people who want

more information, we recommend doing a search of conference papers on this topic. Some of those papers present

other methods for computing ages, but they are generally variations on the methods shown here.

It is important to note that the dates used in these examples were chosen to illustrate the problems involved in

computing ages. In practice, the frequency of such problems is small for any of these methods. In addition, the

magnitude of the problem is small. (The people who had incorrect ages on their birthdays, had correct ages just one

day later.)

At the time this paper was written (summer 2010), there was no single definitive method for computing ages in SAS.

For applications in which approximate ages are acceptable, any of these methods may be sufficient. If you need to

compute decimal ages, the YRDIF method is still best. For accurate integer values of ages, the INTCK method is

best.quotesdbs_dbs28.pdfusesText_34

[PDF] calcul nombre de jours entre deux dates excel 2007

[PDF] dépense énergétique de repos définition

[PDF] déperdition par renouvellement d'air

[PDF] calcul déperdition thermique excel

[PDF] coefficient de déperdition thermique

[PDF] coefficient de déperdition thermique g

[PDF] calcul déperdition thermique logiciel gratuit

[PDF] déperdition thermique définition

[PDF] calculer les dérivées des fonctions

[PDF] dérivé d'une division

[PDF] dérivée seconde nulle

[PDF] dérivée seconde utilité

[PDF] statistique a deux variable exercice corrigé bac pro

[PDF] comment calculer les coordonnées du point moyen g

[PDF] exercice corrigé statistique descriptive a deux variables

[PDF] The YRDIF Function Since age is the difference

Comment faire la différence entre 2 dates sur Excel ?

Comment faire une différence entre deux dates ?

Comment soustraire deux dates ?

Computing Ages in SAS®

Lora D. Delwiche and Susan J. Slaughter

DATA testyrdif;

INPUT (BirthDate TestDate) (DATE11. +1);

FORMAT BirthDate TestDate DATE11.;

DATALINES;

02-MAR-2007 01-MAR-2008

02-MAR-2007 02-MAR-2008

02-MAR-2007 03-MAR-2008

02-MAR-2008 01-MAR-2009

02-MAR-2008 02-MAR-2009

02-MAR-2008 03-MAR-2009

02-MAR-2009 01-MAR-2010

02-MAR-2009 02-MAR-2010

02-MAR-2009 03-MAR-2010

Computing Ages in SAS 2

PROC PRINT DATA = testyrdif;

TITLE 'Results for YRDIF Function';

Here is the output:

Age Age

Decimal Integer

1 02-MAR-2007 01-MAR-2008 0.99955 0

2 02-MAR-2007 02-MAR-2008 1.00228 1

3 02-MAR-2007 03-MAR-2008 1.00502 1

4 02-MAR-2008 01-MAR-2009 0.99498 0

5 02-MAR-2008 02-MAR-2009 0.99772 0

6 02-MAR-2008 03-MAR-2009 1.00046 1

7 02-MAR-2009 01-MAR-2010 0.99726 0

8 02-MAR-2009 02-MAR-2010 1.00000 1

9 02-MAR-2009 03-MAR-2010 1.00274 1

IF MONTH(birth-date) = MONTH(ending-date)

Computing Ages in SAS 3

DATA testyrdif;

INPUT (BirthDate TestDate) (DATE11. +1);

IF MONTH(BirthDate) = MONTH(TestDate)

FORMAT BirthDate TestDate DATE11.;

DATALINES;

02-MAR-2007 01-MAR-2008

02-MAR-2007 02-MAR-2008

02-MAR-2007 03-MAR-2008

02-MAR-2008 01-MAR-2009

02-MAR-2008 02-MAR-2009

02-MAR-2008 03-MAR-2009

02-MAR-2009 01-MAR-2010

02-MAR-2009 02-MAR-2010

02-MAR-2009 03-MAR-2010

PROC PRINT DATA = testyrdif;

VAR BirthDate TestDate AgeDecimal: AgeInteger:;

TITLE 'Comparison of Methods for Computing Age';

Computing Ages in SAS 4

Here is the output:

Age Age Age Age Age

1 02-MAR-2007 01-MAR-2008 0.99955 0.99932 0 0 0

2 02-MAR-2007 02-MAR-2008 1.00228 1.00205 1 1 1

3 02-MAR-2007 03-MAR-2008 1.00502 1.00479 1 1 1

4 02-MAR-2008 01-MAR-2009 0.99498 0.99658 0 0 0

5 02-MAR-2008 02-MAR-2009 0.99772 0.99932 0 0 1

6 02-MAR-2008 03-MAR-2009 1.00046 1.00205 1 1 1

7 02-MAR-2009 01-MAR-2010 0.99726 0.99658 0 0 0

8 02-MAR-2009 02-MAR-2010 1.00000 0.99932 1 0 1

9 02-MAR-2009 03-MAR-2010 1.00274 1.00205 1 1 1