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TTestw_conf (weight, group, value [, sig = 0.025 [, 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 two-tailed level of significance can be specified in sig. If omitted sig will
be set to 0.025, resulting in a 95% confidence interval. See the TTestw_t (weight, group, value [, eq_var =
true]) (page 297) function for descriptions of the other arguments.
Example:
Load Year, ttestw_conf(Weight, Group, Value) as X from abc.csv group
by Year;
TTestw_lower (weight, group, value [, sig = 0.025 [, eq_var =
true]])
returns the aggregated value for the lower end of the confidence interval 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) and TTest1w_conf ( weight, value [, sig = 0.025 ]) (page 300) functions for argument
descriptions.
Example:
Load Year, ttestw_lower(Weight, Group, Value) as X from abc.csv group
by Year;
TTestw_upper (weight, group, value [, sig = 0.025 [, eq_var =
true]])
returns the aggregated value for the upper end of the confidence interval 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) and TTest1w_conf ( weight, value [, sig = 0.025 ]) (page 300) functions for argument
descriptions.
Example:
Load Year, ttestw_upper(Weight, Group, Value) as X from abc.csv group
by Year;
The following eight functions apply to one-sample student's t-tests.
TTest1_t (value)
returns the aggregated t value for a series of values iterated over a number of records as defined by a group
by clause. The values should be returned by value. Text values, null values and missing values in value will
result in the function returning null.
Example:
Load Year, ttest1_t(Value) as X from abc.csv group by Year;
TTest1_df (value)
returns the aggregated student's t-test df value (degrees of freedom) for a series of values iterated over a
number of records as defined by a group by clause. See the TTest1_t (value) (page 298) function for argument
descriptions.
Example:
Load Year, ttest1_df(Value) as X from abc.csv group by Year;
TTest1_sig (value)
298