Hello fellow Stata users,

I have a question regarding the forvalues loop, this is the first time I want to use it. I have a variable called "Distmetro" which is the distance to the metro.
The question that needs to be answered is this:
"Now we want to estimate the marginal effect of distmetro for the non-parametric and semi-parametric models. Repeat this approximation for various distances and do this for both the non-parametric and semiparametric estimation. For example, 100m, 200m, 400m, 600m, 1000m, 2000m, 3000m. Tip: It may be useful to code a loop."

Code:
* Example generated by -dataex-. For more info, type help dataex
clear
input double distmetro
 458.2579040527344
1916.4649658203125
 1843.400146484375
2018.2406005859375
 2277.740478515625
    370.2373046875
1131.3287353515625
     1156.41015625
 309.6813049316406
 564.4126586914063
   1433.2822265625
 1289.849365234375
 1385.840087890625
  1223.51025390625
1727.3624267578125
1923.1534423828125
 2043.496337890625
 1678.600830078125
  1565.65380859375
1584.6746826171875
1998.6033935546875
 371.5183410644531
505.54559326171875
 640.9423217773438
 640.9423217773438
1321.6929931640625
    1045.044921875
 2019.236083984375
 398.2286376953125
 1255.669189453125
 2103.856201171875
 2463.675537109375
 2357.287353515625
 1195.438720703125
1594.8824462890625
119.31536102294922
 403.8852233886719
  1725.53662109375
1744.9683837890625
 1658.052001953125
 1793.210205078125
 712.0525512695313
1101.7047119140625
 2019.236083984375
 1721.634521484375
1321.6605224609375
 911.4725341796875
 832.2876586914063
 564.3883666992188
     619.013671875
277.81719970703125
 394.5236511230469
  564.499267578125
1278.1434326171875
1095.9532470703125
 2109.886962890625
  2057.14208984375
   2064.8876953125
  2503.75927734375
  2194.31689453125
      1194.3828125
  3533.34326171875
362.93072509765625
 535.9008178710938
  1396.98291015625
312.04754638671875
 497.8690185546875
 969.5977783203125
 1773.638916015625
1527.2176513671875
  2009.80126953125
1769.6451416015625
 2100.688232421875
 1947.579833984375
 1914.360595703125
    2083.279296875
   2499.2138671875
 2436.013427734375
 972.3533325195313
1372.7518310546875
 176.5154266357422
 976.3056030273438
 1399.171630859375
   1081.5009765625
       1542.015625
1053.1322021484375
1044.7945556640625
 465.8895568847656
 993.1671752929688
 993.1671752929688
    1260.998046875
1839.2691650390625
     1806.71484375
1786.1949462890625
 2439.008544921875
  2524.68505859375
  2593.27587890625
 753.3658447265625
 690.3713989257813
1591.0655517578125
end
I appreciate any help how someone could help me produce the forvalues function!