statsmodels.sandbox.regression.try_ols_anova.form2design¶
-
statsmodels.sandbox.regression.try_ols_anova.
form2design
(ss, data)[source]¶ convert string formula to data dictionary
- ssstr
I : add constant
varname : for simple varnames data is used as is
F:varname : create dummy variables for factor varname
P:varname1*varname2 : create product dummy variables for varnames
G:varname1*varname2 : create product between factor and continuous variable
- datadict or structured array
data set, access of variables by name as in dictionaries
- Returns
- vars
dictionary
dictionary of variables with converted dummy variables
- names
list
list of names, product (P:) and grouped continuous variables (G:) have name by joining individual names sorted according to input
- vars
Notes
with sorted dict, separate name list would not be necessary
Examples
>>> xx, n = form2design('I a F:b P:c*d G:c*f', testdata) >>> xx.keys() ['a', 'b', 'const', 'cf', 'cd'] >>> n ['const', 'a', 'b', 'cd', 'cf']