# Create a new DataFrame:
df_absch=features.loc[:,["pers_sav_disp_inc","unempl","man_cap_ut","ism_pmi"]]
list_f=df_absch.columns.tolist()
# Generate the 3 Months and 6 Months value changes
for i in list_f:
    df_absch[str(i+"_6m")]=df_absch[i].diff(6)
    df_absch[str(i+"_3m")]=df_absch[i].diff(3)
# Now the original features are dropped since we won't use them anymore:
list_f.remove("ism_pmi")
df_absch.drop(list_f,axis=1,inplace=True)