QlikView Reference Manual.pdf - QlikCommunity - QlikView

Example:
Load Year, ttest_upper(Group, Value) as X from abc.csv group by Year;
The following eight functions apply to two independent samples student's t-tests where the input data series
is given in weighted two-column format.
TTestw_t (weight, group, value [, eq_var = true])
returns the aggregated t value for two independent series of values iterated over a number of records as
defined by a group by clause. The values should be returned by value and be logically grouped via exactly
two values in group. Each value in value can be counted one or more times according to a corresponding
weight value in weight. If eq_var is specified as false, separate variances of the two samples will be
assumed, else equal variances between the samples will be assumed. Text values, null values and missing
values in value will result in the function returning null.
Example:
Load Year, ttestw_t(Weight, Group, Value) as X from abc.csv group by
Year;
TTestw_df (weight, group, value [, eq_var = true])
returns the aggregated student's t-test df value (degrees of freedom) for two independent series of values iterated
over a number of records as defined by a group by clause. See the TTestw_t (weight, group, value [,
eq_var = true]) (page 297) function for argument descriptions.
Example:
Load Year, ttestw_df(Weight, Group, Value) as X from abc.csv group by
Year;
TTestw_sig (weight, group, value [, eq_var = true])
returns the aggregated student's t-test 2-tailed level of significance for two independent series of values iterated
over a number of records as defined by a group by clause. See the TTestw_t (weight, group, value [,
eq_var = true]) (page 297) function for argument descriptions.
Example:
Load Year, ttestw_sig(Weight, Group, Value) as X from abc.csv group by
Year;
TTestw_dif (weight, group, value [, eq_var = true])
returns the aggregated student's t-test mean difference for two independent series of values iterated over a
number of records as defined by a group by clause. See the TTestw_t (weight, group, value [, eq_var =
true]) (page 297) function for argument descriptions.
Example:
Load Year, ttestw_dif(Weight, Group, Value) as X from abc.csv group by
Year;
TTestw_sterr (weight, group, value [, eq_var = true])
returns the aggregated student's t-test standard error of the mean difference for two independent series of
values iterated over a number of records as defined by a group by clause. See the TTestw_t (weight, group,
value [, eq_var = true]) (page 297) function for argument descriptions.
Example:
Load Year, ttestw_sterr(Weight, Group, Value) as X from abc.csv group
by Year;
297