There are Excel functions with identical names (except Normal distribution functions, which are normsdist and normsinv) and behavior.
Function  | 
Explanation  | 
Excel equivalent  | 
|---|---|---|
abs(k)  | 
Absolute value.  | 
abs(k)  | 
arccos(k)  | 
Arccosine. Result is in radians.  | 
acos(k)  | 
arccosh(k)  | 
Hyperbolic arc cosine.  | 
acosh(k)  | 
arcsin(k)  | 
Arcsine. Result is in radians.  | 
asin(k)  | 
arcsinh(k)  | 
Hyperbolic arcsin. Result in radians.  | 
asinh(k)  | 
arctan(k)  | 
Arctangent. Result is in radians.  | 
atan(k)  | 
arctanh(k)  | 
Hyperbolic tangent. K is in radians.  | 
atanh(k)  | 
arctan2(x,y)  | 
Arctangent of y/x. Result is in radians.  | 
atan2(x,y)  | 
besselj(n,x)  | 
Integer Order J Bessel, N=0,±1, ±2…  | 
besselj(x,n)  | 
bessely(n,x)  | 
Integer Order Y Bessel, N=0,±1, ±2…  | 
bessely(x,n)  | 
besseli(n,x)  | 
Integer Order I Modified Bessel, N=0,±1, ±2…  | 
besseli(x,n)  | 
besselk(n,x)  | 
Integer Order K Modified Bessel, N=0,±1, ±2…  | 
besselk(x,n)  | 
beta(j,k)  | 
Beta function.  | 
exp(gammaln(j)  | 
binomial(k,n,p)  | 
Binomial. Probability of k or more “successes” in n trials, when each trial has a probability p of “success”.  | 
1 - binomdist(k,n,p,true) + binomdist(k,n,p,false)  | 
chidist(x2,v)  | 
P value for chi square equals x2 with v degrees of freedom.  | 
chidist(x2,v)  | 
chiinv(p,v)  | 
Chi-square value for specified P value with v degrees of freedom.  | 
chiinv(p,v)  | 
ceil(k)  | 
Nearest integer not smaller than k. Ceil (2.5)=3.0. Ceil(-2.5)=-2.0  | 
(no equivalent)  | 
cos(k)  | 
Cosine. K is in radians.  | 
cos(k)  | 
cosh(k)  | 
Hyperbolic cosine. K is in radians.  | 
cosh(k)  | 
deg(k)  | 
Converts k radians to degrees.  | 
degrees(k)  | 
erf(k)  | 
Error function.  | 
2*normsdist(k*sqrt(2))-1  | 
erfc(k)  | 
Error function, complement.  | 
2-2*normsdist(k*sqrt(2))  | 
exp(k)  | 
e to the kth power.  | 
exp(k)  | 
floor(k)  | 
Next integer below k.  | 
(no equivalent)  | 
fdist(f,v1,v2)  | 
P value for F distribution with v1 degrees of freedom in the numerator and v2 in the denominator.  | 
fdist(f,v1,v2)  | 
finv(p,v1,v2)  | 
F ratio corresponding to P value p with v1 and v2 degrees of freedom.  | 
finv(p,v1,v2)  | 
gamma(k)  | 
Gamma function.  | 
exp(gammaln(k))  | 
gammaln(k)  | 
Natural log of gamma function.  | 
gammaln(k)  | 
hypgeometricm(a,b,x)  | 
Hypergeometric M.  | 
(no equivalent)  | 
hypgeometricu(a,b,x)  | 
Hypergeometric U.  | 
(no equivalent)  | 
hypgeometricf(a,b,c,x)  | 
Hypergeometric F.  | 
(no equivalent)  | 
ibeta(j,k,m)  | 
Incomplete beta.  | 
(no equivalent)  | 
if(condition, j, k)  | 
If the condition is true, then the result is j. Otherwise the result is k. See details.  | 
(similar in excel)  | 
igamma(j,k)  | 
Incomplete gamma.  | 
gammadist(k, j, 1,TRUE)  | 
igammac(j,k)  | 
Incomplete gamma, complement.  | 
1 - gammadist(k, j, 1,TRUE)  | 
int(k)  | 
Truncate fraction. INT(3.5)=3 INT(-2.3) = -2  | 
trunc()  | 
ln(k)  | 
Natural logarithm.  | 
ln(k)  | 
log(k)  | 
Log base 10.  | 
log10(k)  | 
max(j,k)  | 
Maximum of two values.  | 
max(j,k)  | 
min(j,k)  | 
Minimum of two values.  | 
min(j,k)  | 
j mod k  | 
The remainder (modulus) after dividing j by k.  | 
mod(j,k)  | 
normdist(x,m,sd)  | 
P value (one-tailed) corresponding to specified value of x. Normal (Gaussian) distribution with mean equal to m and standard deviation equal to sd  | 
norm.dist(x,m,sd,TRUE)  | 
norminv(p,m,sd)  | 
Quantile (inverse cumulative distribution function) corresponding to one-tail P value p for the normal (Gaussian) distribution with mean equal to m and standard deviation equal to sd  | 
norm.inv(p,m,sd)  | 
psi(k)  | 
Psi (digamma) function. Derivative of the gamma function.  | 
(no equivalent)  | 
rad(k)  | 
Converts k degrees to radians.  | 
radians(k)  | 
round(k,j)  | 
Round the number k to show j digits after the decimal.  | 
round(k,j)  | 
sgn(k)  | 
Sign of k. If k>0, sgn(k)=1. If k<0, sgn(k)= -1. If k=0, sgn(k)=0.  | 
sign(k)  | 
sin(k)  | 
Sine. K is in radians.  | 
sin(k)  | 
sinh(k)  | 
Hyperbolic sine. K is in radians.  | 
sinh(k)  | 
sqr(k)  | 
Square.  | 
k*k  | 
sqrt(k)  | 
Square root.  | 
sqrt(k)  | 
tan(k)  | 
Tangent. K is in radians.  | 
tan(k)  | 
tanh(k)  | 
Hyperbolic tangent. K is n radians.  | 
tanh(k)  | 
tdist(t,v)  | 
P value (one-tailed) corresponding to specified value of t with v degrees of freedom. T distribution.  | 
tdist(t,v,1) t.dist(t,v,true)  | 
tinv(p,v)  | 
t ratio corresponding to two-tail P value p with v degrees of freedom.  | 
tinv(p,v)  | 
zdist(z)  | 
P value (one-tailed) corresponding to specified value of z. Gaussian distribution.  | 
normsdist(z) norm.s.dist(z,true)  | 
zinv(p)  | 
Z ratio corresponding to one-tail P value  | 
normsinv  |