Table:
0
A
B
C
D
E
F
1
District
Incumbent
Party
First elected
Result
Candidates
2
Illinois 3
Robert P. Hanrahan
Republican
1972
Lost re-election Democratic gain
Marty Russo (D) 52.6% Robert P. Hanrahan (R) 47.4%
3
Illinois 4
Ed Derwinski
Republican
1958
Re-elected
Ed Derwinski (R) 59.2% Ronald A. Rodger (D) 40.8%
4
Illinois 6
Harold R. Collier
Republican
1956
Retired Republican hold
Henry Hyde (R) 53.4% Edward V. Hanrahan (D) 46.6%
5
Illinois 9
Sidney R. Yates
Democratic
1964
Re-elected
Sidney R. Yates (D) Unopposed
6
Illinois 10
Samuel H. Young
Republican
1972
Lost re-election Democratic gain
Abner J. Mikva (D) 50.9% Samuel H. Young (R) 49.1%
7
Illinois 12
Phil Crane
Republican
1969
Re-elected
Phil Crane (R) 61.1% Betty C. Spence (D) 38.9%
8
Illinois 19
Tom Railsback
Republican
1966
Re-elected
Tom Railsback (R) 65.3% Jim Gende (D) 34.7%
9
Illinois 20
Paul Findley
Republican
1960
Re-elected
Paul Findley (R) 54.8% Peter F. Mack (D) 45.2%
10
Illinois 23
Melvin Price
Democratic
1944
Re-elected
Melvin Price (D) 80.5% Scott Randolph (R) 19.5%

Questions and formulas:
Question: what year was the first elected incumbant Sidney R. Yates?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="Sidney R. Yates"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,B2:B10="Sidney R. Yates"),4))
Level: medium