Function Reference: M
    @mae	Mean of absolute error (difference) between series.
 
    @makedate	Convert numeric representation of a date to date number.
 
    @mape	Mean absolute percentage error (difference) between series.
 
    @mav	Trailing moving averages (ignore NAs).
 
    @mavc	Centered moving averages (ignore NAs).
 
    @maxerrcount	Maximum number of errors in a program before halting execution.
 
    @maxes	Maximum values (multiple).
 
    @maxsby	Maximum values in a series for each specified group.
 
    @mcor	Trailing moving correlations (ignore NAs).
 
    @mcov	Trailing moving population covariance (no d.f. adjustment; ignore NAs).
 
    @mcovp	Trailing moving population covariance (no d.f. adjustment; ignore NAs).
 
    @mcovs	Trailing moving sample covariance (d.f. adjusted; ignore NAs).
 
    @meansby	Mean of observations in a series for each specified group.
 
    @mediansby	Medians for a series for each specified group.
 
    @mid	Substring in middle or from middle to end of string.
 
    @minner	Trailing moving inner product of two series (ignore NAs).
 
    @mins	Minimum values (multiple).
 
    @minsby	Minimum values in a series for each specified group.
 
    @minute	Minute of the hour of the observation.
 
    @mkurt	Trailing moving kurtosis (ignore NAs).
 
    @mmax	Trailing moving maximums (ignore NAs).
 
    @mmedian	Trailing moving median (ignore NAs).
 
    @mmin	Trailing moving minimums (ignore NAs).
 
    @mnas	Trailing moving missing observations.
 
    @mnrnd	Matrix of normal random numbers.
 
    @mobs	Trailing moving non-missing observations.
 
    @mod	Floating point remainder.
 
    @month	Month of the year of the observation.
 
    @movav	Trailing moving averages (propagate NAs).
 
    @movavc	Centered moving averages (propagate NAs).
 
    @movcor	Trailing moving population correlations (propagate NAs).
 
    @movcov	Trailing moving population covariance (no d.f. adjustment; propagate NAs).
 
    @movcovp	Trailing moving population covariance (no d.f. adjustment; propagate NAs).
 
    @movcovs	Trailing moving sample covariance (d.f. adjusted; propagate NAs).
 
    @movinner	Trailing moving inner product of two series (propagate NAs).
 
    @movkurt	Trailing moving kurtosis (propagate NAs).
 
    @movmax	Trailing moving maximums (propagate NAs).
 
    @movmedian	Trailing moving median (propagate NAs).
 
    @movmin	Trailing moving minimums (propagate NAs).
 
    @movskew	Trailing moving skewness (propagate NAs).
 
    @movstdev	Trailing moving sample standard deviations (d.f. adjusted; propagate NAs).
 
    @movstdevp	Trailing moving population standard deviations (non-d.f. adjusted; propagate NAs).
 
    @movstdevs	Trailing moving sample standard deviations (d.f. adjusted; propagate NAs).
 
    @movsum	Trailing moving sums (propagate NAs).
 
    @movsumsq	Trailing moving sums of squares (propagate NAs).
 
    @movvar	Trailing moving population variances (non d.f. adjusted; propagate NAs).
 
    @movvarp	Trailing moving population variances (non-d.f. adjusted; propagate NAs).
 
    @movvars	Trailing moving sample variances (d.f. adjusted; propagate NAs).
 
    @mrnd	Matrix of uniform random numbers.
 
    @mse	Mean of square error (difference) between series.
 
    @mskew	Trailing moving skewness (ignore NAs).
 
    @mstdev	Trailing moving sample standard deviation (d.f. adjusted; ignore NAs).
 
    @mstdevp	Trailing moving population standard deviations (non-d.f. adjusted; ignore NAs).
 
    @mstdevs	Trailing moving sample standard deviations (d.f. adjusted; ignore NAs).
 
    @msum	Trailing moving sums (ignore NAs).
 
    @msumsq	Trailing moving sums of squares (ignore NAs).
 
    @mvar	Trailing moving population variances (non-d.f. adjusted; ignore NAs).
 
    @mvarp	Trailing moving population variances (non-d.f. adjusted; ignore NAs).
 
    @mvars	Trailing moving population variances (d.f. adjusted; ignore NAs).