NaN on linear regression with many categorical variables

[Elisa Pieri]

Hello,

I'm using PSPP (psppire 0.8.5) on Linux Mint 18.3.

Premise: I'm a big newbie in statistical analysis, so please be patient :)

I have a data set with 23 categorical variables (binary values 0/1) and a continuous variable. I would like to calculate linear regression, using the continuous variable as the dependent one, to understand which ones have the strongest impact.

The syntax that I'm using is:

REGRESSION
        /VARIABLES= GLU4 HIS8 HIS21 GLU36 ASP57 LYS60 GLU62 HIS69 ASP75 LYS96 LYS97 ASP98 ASP120 GLU123 ASP125 LYS153 GLU160 ASP166 LYS167 ASP198 ASP217 HIS219 ASP226
        /DEPENDENT=      Energy
        /STATISTICS=COEFF R ANOVA.

When I try to use less than 10 variables, the analysis works, but when I use all of them I get a lot of Nan:

Model Summary (Energy)
#====#========#=================#==========================#
#  R #R Square|Adjusted R Square|Std. Error of the Estimate#
##===#========#=================#==========================#
#|NaN#     NaN|              NaN|                       NaN#
##===#========#=================#==========================#

ANOVA (Energy)
#===========#==============#=====#===========#===#====#
#           #Sum of Squares|  df |Mean Square| F |Sig.#
##==========#==============#=====#===========#===#====#
#|Regression#           NaN|   23|        NaN|NaN| NaN#
#|Residual  #           NaN|39976|        NaN|   |    #
#|Total     #        499,89|39999|           |   |    #
##==========#==============#=====#===========#===#====#

Coefficients (Energy)
#===========#============================#=========================#===#====#
#           # Unstandardized Coefficients|Standardized Coefficients|   |    #
#|          #-----------+----------------+-------------------------+   |    #
#|          #     B     |   Std. Error   |           Beta          | t |Sig.#
##==========#===========#================#=========================#===#====#
#|(Constant)#        NaN|             NaN|                      ,00|NaN| NaN#
#|GLU4      #        NaN|             NaN|                      NaN|NaN| NaN#
#|HIS8      #        NaN|             NaN|                      NaN|NaN| NaN#
#|HIS21     #        NaN|             NaN|                      NaN|NaN| NaN#
#|GLU36     #        NaN|             NaN|                      NaN|NaN| NaN#
#|ASP57     #        NaN|             NaN|                      NaN|NaN| NaN#
#|LYS60     #        NaN|             NaN|                      NaN|NaN| NaN#
#|GLU62     #        NaN|             NaN|                      NaN|NaN| NaN#
#|HIS69     #        NaN|             NaN|                      NaN|NaN| NaN#
#|ASP75     #        NaN|             NaN|                      NaN|NaN| NaN#
#|LYS96     #       -,01|             NaN|                     -,01|NaN| NaN#
#|LYS97     #        ,50|             NaN|                      ,40|NaN| NaN#
#|ASP98     #        ,00|             NaN|                     -,01|NaN| NaN#
#|ASP120    #        ,12|             NaN|                      ,01|NaN| NaN#
#|GLU123    #        ,02|             NaN|                      ,04|NaN| NaN#
#|ASP125    #        ,00|             NaN|                     -,01|NaN| NaN#
#|LYS153    #        ,00|             NaN|                      ,01|NaN| NaN#
#|GLU160    #       -,02|             NaN|                     -,01|NaN| NaN#
#|ASP166    #       -,02|             NaN|                      ,00|NaN| NaN#
#|LYS167    #        ,00|             NaN|                      ,00|NaN| NaN#
#|ASP198    #        ,00|             NaN|                      ,00|NaN| NaN#
#|ASP217    #       -,04|             NaN|                     -,11|NaN| NaN#
#|HIS219    #        ,02|             NaN|                      ,08|NaN| NaN#
#|ASP226    #        ,00|             NaN|                      ,00|NaN| NaN#
##==========#===========#================#=========================#===#====#

Is there a kind soul amongst you that would explain to me what is going on?

Thank you very much in advance.

Elisa