--anscombe

Switch

--anscombe

Description

A variance stabilizing transformation of the group norm

Argument and Default Value

Normalizes the group norm frequency information using the following formula:

Typically used to transform a random variable with a Poisson distribution to one with an approximately standard Gaussian.

Details

Normalizes the group norm frequency information using the following formula:

Typically used to transform a random variable with a Poisson distribution to one with an approximately standard Gaussian.

Other Switches

Required Switches:

-d, -g, -t

The transformation switches are used during feature extraction and therefore need at least one feature extraction command:

--add_ngrams, --add_lex_table, etc.

Example Commands

# Creates the table: feat$cat_LEX_TABLE$TABLE$GROUP_BY_FIELD$16to8
dlatkInterface.py -d DATABSE -t TABLE -c GROUP_BY_FIELD --add_lex_table -l LEX_TABLE  --anscombe

# Creates the table: feat$cat_met_a30_2000_cp_w$primals_new$dp_id$16to8
dlatkInterface.py -d primals -t primals_new -c dp_id --group_freq_thresh 40000 --add_lex_table -l met_a30_2000_cp --weighted_lex --anscombe